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Where to find short cranks?

Old 07-08-19, 11:25 PM
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Korina
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Where to find short cranks?

For less than $200 (glaring at you, V-O & Rene Herse)? It's crazy that all my small bikes come with 170 and 175(!) cranks; what were they thinking?? I'm looking for a 160 or 165 mtb. crank. Does such a thing exist? Does anyone sell just the arms?

Any suggestions will be gratefully accepted.
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Old 07-09-19, 12:49 AM
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A cold day at a nudist colony.
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Old 07-09-19, 12:53 AM
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Try contacting this guy.

Short Bicycle Cranks

Honestly. Just be thankful that you can get them at any price.
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Old 07-09-19, 03:54 AM
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Originally Posted by Korina View Post
For less than $200 (glaring at you, V-O & Rene Herse)? It's crazy that all my small bikes come with 170 and 175(!) cranks; what were they thinking?? I'm looking for a 160 or 165 mtb. crank. Does such a thing exist? Does anyone sell just the arms?

Any suggestions will be gratefully accepted.
For 165mm MTB from Shimano, currently only XT and XTR have them. Arms are sold separately or as left arms all the time.

Every wife bike I build gets shorter cranks, its kinda a PITA with used bikes.
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Old 07-09-19, 05:42 AM
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Ebay search--- mtb 160 crankset and mtb 165 crankset
160mm 255 listings and 165mm. 263 listings most are new.
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Old 07-09-19, 06:18 AM
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Originally Posted by mrt2you View Post
Ebay search--- mtb 160 crankset and mtb 165 crankset
160mm 255 listings and 165mm. 263 listings most are new.
I was struggling to believe there are that many items out there.
The truth is that you have to take a look at the listings and not just count the numbers.

There are some SINGLE speed cranks being sold in various short lengths on eBay. Not triples. These are newish to the market and pretty much based on BMX racing cranks.
Don't get me wrong, its nice that there's at least some choice although most of these hundreds of listings are from just one or two sellers. It seems to be a newish eBay sales technique for there to be MASSES of the same listing from one seller.

There are triples made in a 150mm length for juvenile bikes but generally MTN triples are made at 170mm.
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Old 07-09-19, 06:33 AM
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165mm crankset

Sugino makes cranksets with 165mm arms; I have a triple w/165mmís on my mtb. Iíve also seen a variety of lengths from Sinz.
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Old 07-09-19, 06:43 AM
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TA "Carmina" cranks are available in 155mm, 160mm, 162.5mm, 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mm and 180mm lengths, but somewhat outside your $200 limit.


https://www.peterwhitecycles.com/carmina.php

165mm Sun XCD cranks can be had for under $200:


https://americancyclery.com/products...s-arms-110-bcd
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Old 07-09-19, 06:59 AM
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If you can't find a triple you can install a big cassette (11-40). Sunrace makes them in several speeds.

SRAM NX 155 mm. For 1x11, obviously, with a 30t steel chain ring. Probably like $140 with the BB.

There’s an Origin8 square taper crank that goes down to 140mm. It’s 5x110mm double BCD. Like $50 for just the crank arms, no rings or bolts.
https://www.amazon.com/Origin8-Alloy-Crank-155mm-SIlver/

Soma sells (sold?) a short crankset to match its Bart kids bike.

You can find people who will modify an existing crank. Ask in the frame builder forum here or the kids MTB subforum on MTBR. Another option is crank shorteners, $100ish; I have a set for my kids on the tandem bike.

Last edited by Darth Lefty; 07-09-19 at 07:49 AM.
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Old 07-09-19, 07:32 AM
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Originally Posted by AnthonyG View Post
I was struggling to believe there are that many items out there.
The truth is that you have to take a look at the listings and not just count the numbers.

There are some SINGLE speed cranks being sold in various short lengths on eBay. Not triples. These are newish to the market and pretty much based on BMX racing cranks.
Don't get me wrong, its nice that there's at least some choice although most of these hundreds of listings are from just one or two sellers. It seems to be a newish eBay sales technique for there to be MASSES of the same listing from one seller.

There are triples made in a 150mm length for juvenile bikes but generally MTN triples are made at 170mm.
if you want specifics all i can say is search yourself. it doesn't cost anything to look.
i modified the search to 160 crank set triple and got 12 listings from 11 different sellers, the seller with 2 had 2 different types. 6 were selling the same part with almost the same price.
i like to make ebay my first choice when looking for bike parts these days. it seems most local bike shops don't have anything in stock anymore "but they can order it. and get it a week" for 2-3 times the ebay price and usually get the ebay parts in under a week. it also seems to be most online stores really don't have much for deals anymore so ebay i go.
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Old 07-09-19, 10:16 AM
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Originally Posted by Korina View Post
For less than $200 (glaring at you, V-O & Rene Herse)? It's crazy that all my small bikes come with 170 and 175(!) cranks; what were they thinking?? I'm looking for a 160 or 165 mtb. crank. Does such a thing exist? Does anyone sell just the arms?

Any suggestions will be gratefully accepted.
I would check with local machine shops and see what they would charge to shorten your existing set for you.

Dan
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Old 07-09-19, 12:02 PM
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J&B Via your LBS?
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Old 07-09-19, 12:32 PM
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Originally Posted by AnthonyG View Post
Try contacting this guy.

Short Bicycle Cranks

Honestly. Just be thankful that you can get them at any price.
Wow, thanks for this. I have a couple of 175 sets that could easily be shortened, and I wouldn't have to worry about compatibility with the bb.
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Old 07-09-19, 02:42 PM
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I have used 165 mm cranks since 1982 and they are still available from major manufacturers. I have Ultegra, Campy Record, SRAM Red, etc. and just bought a new set of 105s.
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Old 07-09-19, 02:43 PM
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Originally Posted by Korina View Post
Wow, thanks for this. I have a couple of 175 sets that could easily be shortened, and I wouldn't have to worry about compatibility with the bb.
Be sure to check with him directly. I've heard that he's been trying to scale back for some time.
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Old 07-09-19, 03:06 PM
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Thanks @Trsnrtr, good to know.
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Old 07-10-19, 06:03 AM
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Just bought a set of 160 mm Origin 8 cranks from Amazon for my grandson for $50. They are available on Ebay as others have said. Just do a search for 160mm Crankarms.
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Old 07-10-19, 11:02 PM
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You guys are all awesome! Thank you for your suggestions, they're all very helpful.

It has been brought to my attention that I may have left off some relevant information from my original post, such as the bikes I'm speaking of are vintage mountain bikes, which complicates everything. We have found a source for 160 "youth" cranksets, but of course the first rule of upgrading bikes says that it doesn't fit; the spindles are too long (bike's are 128 mm, crankset requires 113 mm). ::headdesk::
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Old 07-10-19, 11:12 PM
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BMX is the easy off-the-shelf route, with 5x 130/110 at least, but they don't do grannies.
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Old 07-11-19, 06:14 AM
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Ebay maybe?
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Old 07-11-19, 08:31 AM
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Seems to be a trend... medium sized bikes coming with 175mm crank arms.
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Old 07-11-19, 02:40 PM
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Originally Posted by MikeyMK View Post
BMX is the easy off-the-shelf route, with 5x 130/110 at least, but they don't do grannies.
Noooo, I <3 my get-up-the-hill gear!


Originally Posted by trailangel View Post
Seems to be a trend... medium sized bikes coming with 175mm crank arms.
Must be an old trend; both my Rockhopper and Singletrack are small size and both came with 175s. Crazy, man, crazy.
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Old 07-11-19, 04:11 PM
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Originally Posted by Korina View Post
Wow, thanks for this. I have a couple of 175 sets that could easily be shortened, and I wouldn't have to worry about compatibility with the bb.
Korina,
It may sound great, but shortening crank arms will be a challenge. The arms will have to be shortened and then re-welded, or the pedal spindle holes will need to be filled (re-welded) and positioned correctly and will cost more than a new crank arm. Look around both on the internet and some bike co-ops. Places like Madison and the Colorado State co-ops will have some of those around. I could look here in the Bloomington co-op for you but, will take a few weeks.
btownbicycleproject should get you through to them and they can search for you. HTH, Smiles, MH

Just googeled 165 crank sets and found two Sugino's for less than $50! deepen your search protocols, Smiles, MH

Last edited by Mad Honk; 07-11-19 at 04:18 PM. Reason: correction
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Old 07-11-19, 04:16 PM
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Originally Posted by Mad Honk View Post
Korina,
It may sound great, but shortening crank arms will be a challenge. The arms will have to be shortened and then re-welded, or the pedal spindle holes will need to be filled (re-welded) and positioned correctly and will cost more than a new crank arm. Look around both on the internet and some bike co-ops. Places like Madison and the Colorado State co-ops will have some of those around. I could look here in the Bloomington co-op for you but, will take a few weeks.
btownbicycleproject should get you through to them and they can search for you. HTH, Smiles, MH
Thanks and you're right. My mtb. cranks are very different from road bike cranks, making them entirely unsuitable for shortening. Still, it's a great idea for the right bike. I think what he does is cut off the bottom and drill a new hole.
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Old 07-11-19, 09:27 PM
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Originally Posted by Korina View Post
You guys are all awesome! Thank you for your suggestions, they're all very helpful.

It has been brought to my attention that I may have left off some relevant information from my original post, such as the bikes I'm speaking of are vintage mountain bikes, which complicates everything. We have found a source for 160 "youth" cranksets, but of course the first rule of upgrading bikes says that it doesn't fit; the spindles are too long (bike's are 128 mm, crankset requires 113 mm). ::headdesk::
You can't change the BB because? 73 X 113 BB are readily available
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