Crank Type Identification

Рет қаралды 1,162,703

8 жыл бұрын

How to identify which style of crank is on your bike. You will be guided to the corresponding crank removal and installation video if it exists in our collection.
Questions or comments? Leave them below!
See all our Crank & Pedal videos in our Crank & Pedal playlist: • Repair Help: Cranks an...
For a text-based walk-through of this process: www.parktool.com/blog/repair-h...
The following crank types are covered:
• Self-extracting cranksets ▶︎ • Crank Removal and Inst...
• Two-piece compression-slotted cranksets ▶︎ • Crank Removal and Inst... )
• Campagnolo® Power-Torque™ ▶︎ • Video
• Campagnolo® Ultra-Torque™ ▶︎ • Crank Removal and Inst...
• Three piece crankset ▶︎ • Crank Removal and Inst... , including:
- ISIS Drive
- Shimano® Octalink®
- Power Spline™
- (for BMX/Freestyle Crank see www.parktool.com/blog/repair-h...)
• One-piece cranksets ▶︎ • One Piece Crank & Bott...
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Did you know that Park Tool is the #1 resource for bicycle repair education?
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• Visit the Repair Help section of Parktool.com: www.parktool.com/blog/repair-h...
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➤ About Park Tool:
Since our founding in 1963, Park Tool has been the leading name in bicycle tools. Our KZfaq channel is an extension of our mission to be the ultimate resource for mechanics and riders of all skill levels. Here you will find comprehensive repair help tutorials for a wide range of components and processes, as well as troubleshooting guides, tips and tricks, and information on the latest Park Tool products.

Пікірлер: 205

@joshgardner8671 3 ай бұрын

0:22 (1) Self Extracting Crank System 1:15 (2) Two-Piece Cranks 3:35 (3) Three-Piece Cranks 5:49 (4) One-Piece Cranks Great video - thank you!

@Quadflash 6 жыл бұрын

Calvin, I've started rehabbing bikes at our local bike co-op. I had no idea how many different bikes and components there are. Your videos and your Big Blue book keep me productive and a whole lot less frustrated. Thanks for your straight and understandable instructions!!!

@explorer8888 4 жыл бұрын

David Sonnen What is a bike co-op? I’m not from the States and not familiar with the term?

@chadkline4268 Жыл бұрын

A cooperative effort/business of some kind where several interests cooperate in some way.

@bullballsallday 6 ай бұрын

@enriqueamaya3883people like you actually repel people from Christianity.

@jeffreyvictor3678 4 жыл бұрын

Very well explained! I like and am grateful that you supplied the link to the need video as you were explaining.

@ConcreteJungle95 4 жыл бұрын

Amazing video thanks. Very professional filming and explanations

@budabead 5 жыл бұрын

Another great video! thank you! I just got myself a pcs-9 and have a number a jobs lined up. i could do some of it but i gotta be honest... you're way to smooth at explaining things in simple terms and i just love your passion for it all - can tell you've been in this business for a while. park tool for the win:) love from the UK

@jimtoneyNoBaloney 11 күн бұрын

Super helpful for my old Santa Cruz. Thank You!

@tatangsm09 Жыл бұрын

It's really helpful from the above explanation. Thanks.

@that70sschwinn 7 жыл бұрын

Great info, thanks for sharing

@blodeuweddcooper8970 4 жыл бұрын

Very informative video, thank you very much!

@lokmanmerican6889 2 жыл бұрын

Outstanding instructional video!

@calvinjonesfan6566 7 жыл бұрын

Hi Calvin I am your biggest fan. Thank you so much for making this helpful video.

@dontbothermeimjust12 5 жыл бұрын

Best profile picture.

@2ForceCycles 4 жыл бұрын

Omg

@Jordan-uz9me 3 жыл бұрын

I know he probably hears it every day but you're his biggest fan You even have the underground shit he did with Skam

@MrIvanGino 8 жыл бұрын

Best channel ever

@soccerking3278 3 жыл бұрын

Got a lot of idea. Thanks Park Tool.

@eduardodeleon1 6 жыл бұрын

Great presentation.

@vvvvali 5 жыл бұрын

Awesome video!

@hyderrider3716 2 жыл бұрын

Super helpful 👍 thank you

@lazmotron 5 жыл бұрын

Excellent and helpfull video

@LuoRutina 7 жыл бұрын

I would love a similar video for bottom brackets.

@tankertango3282 6 жыл бұрын

great job

@spawnage170 8 жыл бұрын

THANK YOU FOR THIS!!!!

@umar344s 4 жыл бұрын

You shouldnt be

@JuliusCesar2781 6 жыл бұрын

Top Video! You are great 1a+++!

@TomAbramoff 5 жыл бұрын

the video series' from park are legendary. thank you!

@igypop. 4 жыл бұрын

10/10 for informative video

@krishnansrinivasan830 Жыл бұрын

Awesome & Thanks :)

@beachazzkneeguh8619 3 жыл бұрын

After seeing this video, who's more lost and confused lol

@uniworkhorse 2 жыл бұрын

With you there

@davidwales9657 2 жыл бұрын

Yup.

@daveyboy6210 Жыл бұрын

Looking for the link " I am lost

@bullballsallday 6 ай бұрын

@enriqueamaya3883oh fuck! Here we go again!

@bullballsallday 6 ай бұрын

Too many options. I miss the good old days when there were just mainly two types of bottom brackets.

@gordonreid8649 3 жыл бұрын

What would we do without Calvin? Well done videos!

@MakeMajor 6 жыл бұрын

This guy is so cool

@umar344s 4 жыл бұрын

Hes a grumpy old man

@jackadamsdaniels6719 5 ай бұрын

Thank you !

@Tombrosapien 2 жыл бұрын

Hey there, excellent video, however I’m not sure mine was mentioned, I have a hexagon 14mm nut both sides covered my little rubber cap and I’m guessing the one on the right (next to the crankset) goes through to the other side, it’s an SR SUNTOUR model and I’m assuming it’s a 2 piece crank, how do I undo it?

@armancelorico2202 5 жыл бұрын

Hi sir. Wouldnt there be any serious issues if I use an 8 speed crankset ( shimano claris r2000 to be specific) on a shimano tiagra 4700 10 speed system?

@IAMOGiNKD 7 жыл бұрын

Hi! I have an old bike with the Non Self Extracting crank on it. Is there any way you can post a video of give me information on how to remove it? thanks!!

@Thomass7586 8 жыл бұрын

I want to pull the crank on my 1985 Schwinn Traveler to service it. But I,m not sure what thread size puller I need. any help would be greatly appreciated.

@baileybasty5883 3 жыл бұрын

i just want to ask what specific type of crank lock should i buy for my pinewood hero 1.9?

@breuer2j 4 жыл бұрын

Yo how come your shortcut video links do not work? You guys rule and thank you so much for putting the time in for these video. Is there a park tool set I can purchase for beginner bike maintenance ?

@henryhartsfield4574 2 жыл бұрын

Hi Calvin do you know what crank is on the Trek verve three? Thanks

@mujiangtan3238 6 жыл бұрын

Hi Calvin, great video, I like your videos always with explanations on how it works before how to do it. The left crank blot of my bike is lost. I like to find compatible bolt and fix it myself. How to figure out which bolt? The arm is ISIS drive type. I guess cap size and axel thread size are important. I see online stores carry blots for M8 and M15 etc. but I don't have knowledge on what they mean and how to determine the blot I need. Thanks.

@parktool 6 жыл бұрын

ISIS bolts come in two sizes. Either an M15 or an M12. You can determine this by measuring the ID of the hole in the spindle. When you measure, the measurement will come out just shy of 15 or 12. This is because you are measuring the minor diameter and bolts are labeled by there Major diameter. I hope this helps!

@robertmcfadyen9156 11 ай бұрын

ISIS drive cranks are one of the worst 3 piece interfaces ever . Sometimes removing them can be a nightmare , particularly ones with an outboard elliptical / slotted sides lockring from around the year 2000 .

@lamkienvinh1194 2 жыл бұрын

Great!

@randomstuff9048 4 жыл бұрын

Thank you

@petrosrz8990 6 жыл бұрын

4:30 that’s a nice way to get FBIied while repairing bicycles

@parktool 6 жыл бұрын

True story: several of our crank videos were briefly demonetized by KZfaq due to the name of that standard showing up in the title or description. We had to write an appeal letter explaining that our videos were not, in fact, about the terrorist group. - Video Guy

@dontbothermeimjust12 5 жыл бұрын

Isis is also actually a woman's name in many countries. I've seen it also for an engineering hydrodynamics calculation software (that predates the terrorist group). Those terrorists basically killed a lot of acronyms for stuff.

@badbradmx 5 жыл бұрын

old comment but ISIS is also the name of an Egyptian God of magic, as an FYI

@umar344s 4 жыл бұрын

@@parktool SHUT UP I DONT LIKE YOU OLD GRUMY MAN

@Waelalshami 6 жыл бұрын

Hi, and thanks for the video, i want to build a 11 speed MTB with one peace crank, most likely shimano type, what crankset you recommend for this?

@rrivera5249 3 жыл бұрын

I have a 1996 TREK Mountain Track 820 with a Shimano Altus FC-CT91 Crankset. I'm having issues finding a similar crankset to install. It's a 38/32/24 tooth crankset. Can I install a different size crankset ie., 42/38/24? Would that work? Would appreciate anybody's input. Regards

@robertmcfadyen9156 11 ай бұрын

I have a set of Shimano 431 octalink cranks where the brooching was done in each arm but with a 0.5 degree error between them which is a rare slipstream quality control "FAIL" that ended up in my spare parts inventory new .

@IshaiSilencioAldema 3 жыл бұрын

I ws hoping to finally Get some understanding of the crank on my pre 1950 black bike. But then again, no. Anyone knows if Theres a video on an Old crank like that? Its seems like I have to open the bedt side with a hammer and a kind of pin-version of a screw driver? Help

@brunobaumanis7869 7 жыл бұрын

i am a noob at bikes and stuff and basically i want to put on a new crankset on my mtb bike and i guess i have a 3 piece one.. can i put on a 2 piece one on it? or are they not interchangable? btw i want to do this all by myself without the help of a bike shop.. for fun

@parktool 7 жыл бұрын

You can install a 2-piece where there was a three piece. It will mean replacing the entire system. The bearings will be different, and the spindle comes on the arm. You need to get one made for the width of bottom bracket shell you have. Measure the width, likely a 68mm or 73mm. -Calvin

@brunobaumanis7869 7 жыл бұрын

Park Tool thanks a bunch!

@gabrielt6556 Жыл бұрын

When he says the list go on in the matter of time, I'm dead.

@fabriciocoto1756 5 жыл бұрын

I have this crank set Raceface Æffect Cinch w/ Steel 30T "Narrow Wide" from a diamondback atroz 3 2018, which crank puller do I need CCP-44 CCP-22

@parktool 5 жыл бұрын

CCP-44 on the Raceface Effect.

@dontbothermeimjust12 6 жыл бұрын

So cool, my crank looks nothing like none of those, and I need to replace it. Screw my life.

@umar344s 4 жыл бұрын

Yeh screw you

@paulspyker3749 4 жыл бұрын

Yeah, my crank wasn't shown.

@antoniohernandez6590 3 жыл бұрын

u get your bike from Moldova or wut

@goodboyringo9716 3 жыл бұрын

Hey you have the same life as me.

@jensongroff 3 жыл бұрын

Same

@ruiferraz9904 3 жыл бұрын

Greetings park tool, excellent video, I have learned a lot from you, I have only one doubt, I have a cannondale carbon 2 mtb 2018, which tool do I use to remove the crank arm from my bb30? three pieces, big hug from Portugal

@parktool 3 жыл бұрын

Cannondale Si cranks have a special removal tool that is required. There are tricks around this so that you can use a common crank puller. If you find a washer that will fit the ID of the crank hole so that it the washer will push on the spindle then you can use something like our CCP-44 or CWP-7 with the large swivel foot.

@ruiferraz9904 3 жыл бұрын

@@parktool Thank you, I will try for sure, and of course, I will continue to accompany you, thank you and big hug from Portugal

@ricardodelrey7677 6 жыл бұрын

Hello, I just bought a vintage triple SORA crank-set but I don't know what length of bottom-bracket spindle I need? It's for my old school 8 speed road bike 45 cm. All I know its a Square Tapper JIS, English thread 68 Shell. : /

@parktool 6 жыл бұрын

Yikes thats a tough one to figure out. What is the model number that is just inside the crank arm? It should be something along the lines of FC-3300 or FC-3303 or something along those lines. The crank arm length should be in the same section of the crank so a 170, 172.5 or 175 will be right above or below it.

@marccaldw 3 жыл бұрын

Thanks for the video My question is can I upgrade the crankset on my specialized Allez Comp For a 105 crankset. What I should know about I really appreciate Thanks

@parktool 3 жыл бұрын

You sure can. Depending on what crank you have on your bike you may only need the crank or you may also need a bottom bracket and crank.

@marccaldw 3 жыл бұрын

@@parktool i Really appreciate

@vitalijletko2828 4 жыл бұрын

You can’t charge 5 grand for a bike with a square taper bottom bracket, it’s gotta be fancy , don’t you know, even though it performs the exact same function.

@jackbeames7643 6 жыл бұрын

On the 2 piece crank my spindle is on the non drive side arm. Is this the same?? They are called Race Face Chester 38x24T, 170mm

@parktool 6 жыл бұрын

This should be the same. Raceface chesters are pedals. I'm thinking you have a Raceface cinch style crankset and is a self extracting style crankset. These are very versatile and can be converted to different setups.

@ffiiqqqqqq 4 жыл бұрын

I'm new to cycling and I can't figure out if a particular crank set that's on sale will fit my current road bike. How do I be sure before purchasing it? :'(

@stopbanningmeonets3514 3 жыл бұрын

Watch this video, if still unsure, post a picture of it on a forum like Reddit (r/bikewrench would be a good sub)

@mugiwaraluffy3287 5 жыл бұрын

Hi sir, can I use roadbike crank on my mtb? I'm planning on making it hybrid.

@parktool 5 жыл бұрын

Yes you can. It will take a bit more thought depending on what crank you select. Often MTB crank spindles and road spindles are different lengths. You need to accommodate for the different dimension when selecting a bottom bracket, or with spacers.

@chanpit5771 2 жыл бұрын

my crank comes off with a socket and its really small what tool do i use?

@xdi1733 3 жыл бұрын

I don't see my 2020 Specialized Rockhopper Expert 1x crankset which has "stout" printed on the crank arms. @park tool can you help me figure which crank is my type and how to properly remove it?

@parktool 3 жыл бұрын

Start by removing the 8mm hex bolts from the cranks. That will likely tell you what type you have.

@diluczhongli3340 Ай бұрын

Mine says Powerwheel on the pedal arm, I can't find anything that says what type it is. Anyone know?

@FloridaMan69. 3 жыл бұрын

cool

@MrPgabox Жыл бұрын

Hi. My question: how to remoove FSA ML401A. Do I need any special tools?

@parktool Жыл бұрын

I was unable to reference that part number. Its likely that it has a one key release though.

@ajbulan2029 3 жыл бұрын

2:11 that's a *T H I C C* hex wrench

@kinanhloubi1935 4 жыл бұрын

HELP!! i was just making restoration on my old bicycle and it has Ventura Crank (Italien brand) Arm which i want to remove, but the arm doesnt have threads that are fitting for crank puller... what can i do!? :(

@parktool 4 жыл бұрын

Hello, Could you send an image of your crank to tech@parktool.com ? That will be a good place to get you the help you need on this. Thanks!

@michaelberna987 Жыл бұрын

I could've sworn Calvin played in the Disney Atlantis movie.

@jmannUSMC 2 жыл бұрын

Man I really hate bike engineers

@jpm000001 Ай бұрын

I used to work with one, he was a massive twat actually

@TehDanno1 4 жыл бұрын

My crank has a nut on both sides. I think the crank itself is one that goes through both sides with bolt like arms or whatever. The left side has a large ring that tightens down to the frame to keep the shaft in place. That has 3 groves in it at 3 points. Not sure which tool is used to tighten or loose that ring. Other than using a wedge and hammer which seems very inefficient.

@parktool 4 жыл бұрын

Hello Daniel, Could you send an image of your crank to tech@parktool.com We can then give you a better idea of the tool you need for your crank.

@Leejarm 4 жыл бұрын

would be great to work on bikes that look brand new and pre-loosened. Love these Park Tool videos

@FarmerFpv 4 жыл бұрын

It's a demo to get people over to the right video for their cranksets, what did you expect? Are you always this narcissistic?

@henrybeenh7076 6 жыл бұрын

Yep, my bike's got a cotter pin crank with the presspin, I believe we call this last piece of metal a 'spie-tje' (I'm Dutch) and this spie-tje is completely stuck, I've been banging it for 20 minutes now and it's freezing outside so my fingers are frozen... I'm not very happy right now.

@parktool 6 жыл бұрын

The cotter pin system is not so good, as you have learned. The pins are made of softer steel, and will often deform when hit with a hammer. Sometimes there is not a happy ending here. Begin by getting the bike inside and warm. In fact get mild heat on the crank like from a hair dryer. You are hitting the threaded end, yes? If the threads are bent, you will need to snap them off, and then use a punch to reach inside. Even this is not always good because you can expend the pin as you strike it, making it harder to remover. It can often come down to drilling out the pin. Good luck.

@henrybeenh7076 6 жыл бұрын

I did it, haha, but now I have an axis which appeared to be pressed into the frame. I can perhaps hit the whole axis out of the frame but will I be able to buy something that will fit in it... this is the problem with an old bike and with old I mean this bike is probably more than 30 -40 years old. I've had it for well 15 years I think and never did any maintenance... terrible. It's been a very good bike, I'm afraid there's nothing I can do for repairing it now.

@raphaelnjogu5006 Жыл бұрын

what happen when the crank slide, is it the chain or free wheel

@deanstanley5799 5 жыл бұрын

Why so many different crank designs it was just a crank extracter tool for every make and that's all you needed in your tool box !!!!

@darthvato3303 3 жыл бұрын

My cruiser has a one piece crank, can I install a mtb 3 gear crank??

@parktool 3 жыл бұрын

It is possible, see kzfaq.info/get/bejne/jZ-qg86jqNq7dYE.html

@red2 7 жыл бұрын

What type of system is a Shimano FC M391 crank ? What tool will I need.

@parktool 7 жыл бұрын

Remove the crank bolt and inspect inside the arm. That should be a square spindle. Use the CWP-7 or CCP-22.

@dreadknot2238 5 жыл бұрын

dude i live in asia id ride my bike to your shop and get it fix by park tool.

@carbonarne675 3 жыл бұрын

Just undone my padals from my one bike to fit them on my other one and they don't fit... Why? And what type of padal exist/ I need (sram red cranks)

@parktool 3 жыл бұрын

Pedals are right and left specific so that could be the issue you are running into. There are 2 pedal sizes out there but the smaller 1/2 size is only found on one pice/ashtebula cranks and not on more modern 2 and 3 piece cranks.

@adeelrehman29 4 жыл бұрын

I went to buy fat bicycle, the bike is fine but they have crank arm and pedals in some sort of hard plastic material should i buy it or find metal one?

@parktool 4 жыл бұрын

If this is for winter riding, the plastic can be a good thing. A plastic pedal transfers less heat from your feet compared to a metal pedal.

@Dragon1165 4 жыл бұрын

I have a cotter pin style on my older road bike... guess I'm stuck

@ahmedfurany8641 3 жыл бұрын

How do I take of the cotter? I’m trying hard on my bike but it won’t nudge

@parktool 3 жыл бұрын

Those can be difficult. The pin is pressed tight into the crank. A tool is the best method to un-press it and remove it. See an example here- kzfaq.info/get/bejne/grmVZ9qCld63eGQ.html People often use a hammer, but that can be very hard to do. The thread bends and breaks. Then a punch must be used.

@iamspecialized398 5 жыл бұрын

Is it possible to upgrade a square type crankset to a hollowtech type? Thanks.

@parktool 5 жыл бұрын

Sure is. Just need to find a crankset that will be compatible with your drivetrain.

@iamspecialized398 5 жыл бұрын

@@parktool i have my cannondale synapse claris, already replaced the drivetrain to shimano 105 and planning to upgrade the crankset to hollowtech type but i'm a bit confuse about the bottom bracket, it is a threaded type. Asking for advice, what's the appopriate hollowtech crankset to be use?

@parktool 5 жыл бұрын

You can run any of the current 105 cranksets. The BBR60 is a great fit for the 105 crankset. You could also use an Ultegra or a Dura ace bb as well. Great thing about Hollowtech II is that it is consistent through the range.

@iamspecialized398 5 жыл бұрын

@@parktool Thank you Sir, im your new fan from the Philippines. Like all your videos.

@joesimpson4655 3 жыл бұрын

How do I figure out if I have a standard crank or compact crank? How do I find out what gear ratio my crank is ? Please help

@wenxuanteoh6186 3 жыл бұрын

For the gear ratio, just count the number of teeth on the front and rear sprockets

@martinskof6196 5 жыл бұрын

campagnolo can't even standardise 2 crankset types, they need 3 of them...

@moviesforrandy 2 жыл бұрын

where is the two piece video?

@dreadknot2238 5 жыл бұрын

park tool soo much better then HowTo rofl.

@rmu000 2 жыл бұрын

okay so the crank arm of my bike broke and i was thinking if i could just change just the crank arm instead of buying a new crankset and also without changing my current gears.. i'm new to this stuff can someone experienced help me out?

@parktool 2 жыл бұрын

You can usually just replace one of the arms. but this does depend on the style of crank and what side broke.

@rmu000 2 жыл бұрын

@@parktool the side where there's no gears broke and i thought of changing both arms without changing the gears.. is it possible?

@parktool 2 жыл бұрын

The most cost effective way is to find a left hand crank arm that has the same crank arm length as well as style and orientation of spindle.

@dreadknot2238 4 жыл бұрын

wow... so many different cranks styles.. humanity is doomed now. two crank style is obviously not enough i guess designers need to make 30 different styles to confuse the shit out of us, maybe their local bike shops are probably contracted with these designers so will have to go the local bike shop to get install by technician and pay them instead , if we do ourselves it be too easy these local bike shop would be out of business with no job. that is my 2¢ theory

@goat7665 5 жыл бұрын

What if your cranks are two piece but don’t have the pinch bolts and just have an 8mm hex bolt, and are not Campagnolo...

@jakegarrett8109 5 жыл бұрын

Wow, I think this video has more material covered than most of the useless linguistics/diversity classes I had to take and write essays for, except this video is actually very useful and under 7 minutes packing it all in very well! As a mechanical and aerospace engineer, there are over a billion ways to solve a problem, and it looks like bicycle companies never could settle on one... well, at least this guy covers them well! Great video, you could have a degree in just bicycle repair from all these variations, I’m glad they got an expert on this subject, makes my life easier, thanks!

@umar344s 4 жыл бұрын

Wow you know a lot smarty pants

@savoirfaire8979 3 жыл бұрын

*These bikes are easier to work on compared to my cheap Glarewheel e-bike. No specs were provided, so I have to research and measure every part replacement and upgrade.*

@stealhart3327 6 жыл бұрын

that dude is a strick looking guy, if i were still a child i would probably scared to death just by walking down the path way of his house hahahaha,, anyways good channel and a lot of informative thing you got here

@dontbothermeimjust12 5 жыл бұрын

Steal Hart He might look hard on the outside, but he sounds like the chillest guy to me

@Alphabear89 4 жыл бұрын

If i were replacing the entire crankset, does it matter what cranks i have on right now?

@parktool 4 жыл бұрын

If by crankset you include the bottom bracket, it does not matter. The new set needs to be compatible with the frame, that is all.

@DisProveMeWrong 2 жыл бұрын

All these nice high end cranks, and here I am trying to remove a POS crank from a bike I found in the trash.

@TheSamwhyte 3 жыл бұрын

Is it normal for there to be a small gap (approx 7mm) between a crank arm and the bottom bracket?)

@parktool 3 жыл бұрын

Depending upon the type and model, yes, it can be normal.

@TheSamwhyte 3 жыл бұрын

@@parktool Okay thanks - I recently bought a second hand bike and I've always been paranoid that it was a sign it was going to perish!

@slippy9916 4 жыл бұрын

Can someone tell me why the difference on crank arm length. I'm a 175mm user

@parktool 4 жыл бұрын

Cranks vary in length depending upon brand/model. From 160 to 180, in small increment. The crank is a lever, so the longer the easier to turn. But it is also further around that circle. Shorter cranks can be turned a faster RPM easier. The knee also articulates (bends) more with longer arms, and that can be an issue for some. The body has levers as well in the femur lower leg, and these of course can vary in length. Then add in riding style, it is not a simple choice. But it can be. If you are new to riding, ride what you got for now.

@slippy9916 4 жыл бұрын

@@parktool : Thanks for sharing that knowledge. I've been riding since 1994 & I still have today my Balance XR - 350 MTB. & it came with 175mm. Stuck with that number since. I remember my bmx had long cranks, too. I'm 5'6 at 150 lbs & 54 yrs. Young. Now, is there a formula between length of the arm's & number of teeth on the ring. Just curious. All I have to ride here in this part of Nebr. is the local BMX track. & figured the outer ring ( 46 ) & 4th on the 8 speed cassette is the way I can clear the jumps. Thanks again guys