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Small (155mm?) crank suggestions

24K views 18 replies 9 participants last post by  lloydus 
#1 · (Edited)
Hi all,
I am building a 26er for my daughter. The frame is 41x92mm BB92 bottom bracket. I think 155mm crank length is about right (possibly a bit too long but I don't want her to outgrow it too soon.

Any suggestions of cranks given the frame and what BB should I get to go with them?

Thx, Lloyd
 
#18 ·
Anybody got some updated suggestions for shorts cranks for BB92? The Trailcraft ones are out of stock, and I cannot find anyone who stocks155mm SRAM SX (I'd like a 12 SRAM ideally). This is for a kids bike build on a chinese carbon 26er import frame (BXT). All help much appreciated!!
Looks like the 165's are available in a few places if there's any chance those would work. I'm guessing it may be a wait based on manufacturing problems right now though. I couldn't find any of the 155 NX's either, seems like a major shortage of short 2 piece cranksets everywhere.
 
#2 ·
There are three pretty popular upgrade options, but all seem to be GXP style BB:

Trailcraft Direct Mount 152mm
https://www.trailcraftcycles.com/product/trailcraft-direct-mount-cranks/

Brood Styx 155mm
https://spawncycles.com/brood-eldorado-syx-155

SRAM NX 155mm
https://www.amazon.com/Sram-Nx-Crankset-Gxp-155/dp/B01BZBTDSC

Trailcraft are the most expensive, but have an alloy bottom bracket spindle to keep the weight low and come with an alloy chainring. They are about 150+ grams lighter than a SRAM NX 155mm which uses a steel spindle and comes with a steel chainring. Not sure if light weight is important or not, but that's about 1/3 of a pound. More pics with weights here https://www.pinkbike.com/buysell/2425155/

For BB, since you have BB92 I think you will need a BB92 to BSA 24mm spindle BB adapter.

https://wheelsmfg.com/bottom-bracke...-abec-3-bb-for-24mm-shimano-cranks-black.html

Best thing to do is to figure out what cranks you want then contact Wheels Mfg to verify you are getting the right BB. But I think the one linked above is what you need.

Hope it helps!
 
#5 ·
Thank you Jestep. So I am going to for a trailcraft 152mm crank which "use a BSA (Shimano standard) 24mm spline", primarily because it is substantially lighter than some of the alternatives.

I am still confused about which bottom bracket and what the pros and cons of the various choices are at https://wheelsmfg.com/bottom-brackets/bb86-92.html?bb_standard=6855&color=69&crank_spindle_dia=7121.

I have 2 questions:
1) Can someone help me decide among:
-ABEC-3
-Angular contact
- Thread together ABEC-3
- Thread together angular contact
2) Are there alternatives to these Wheels mfg bottom brackets that might be lighter or less expensive?

Here's a link to the trailcraft crank:
https://www.trailcraftcycles.com/product/trailcraft-direct-mount-cranks/

In case anyone else is reading this I found a few others in the 152mm to 155mm range. Here they are:
1) SRAM NX 1x X-SYNC™ Crankset 30t (not bad choice but heavier than trailcraft)
2) Trailcraft 30t ($170 incl cog and lightest)
3) Suntour 1x ZERON 30T Aluminum Crankset hollowtech 2 (quite heavy but least expensive)
4) Canfield Brothers*DH 83mm Crank with BB (heavy not sure weight)
 
#7 ·
Have to update this post. There are two good alternatives.

1) Brood Bike co Styx direct mount crank is 155m and 590grams excl BB and chainring for $115. Add on a light chainring for $36 and 50g and you are all in for $151 at 640 grams for a 155mm.
2) Trailcraft who have a $159 price for a 152mm crank with a 28t chainring weighing a total of 573 grams.

Good enough choices.
 
#9 ·
I was interested in a single speed crank that would fit a BB92 frame. I could not find a Suntour XCR 155mm using a google search. I could find a Suntour XCT 152mm however this was a triple and not a single. I looked on the suntour website at ChainwheelÂ*- SR SUNTOUR Cycling and could only find one single speed crank. It is the ZERON ZERON-1X which is available in 152mm but when I went to find one for sale on the web I was not successful. Also it has a minimum 30t chainring.
 
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