BB Size

[BackWoodCycle]

I'm trying to switch the 3 piece cranks out on my singlespeed but I don't know which size to get.

I guess my pedal wasn't tightened all the way in on my last ride or it came loose and pretty much ripped the threads out of the right side of my crank.

Here's a picture of the bike if that helps.

 

[user 135]

If your crank arms are just damaged you should be able to replace the cranks without replacing the BB. Any singlespeed crank should work with the axle length of the current bottom bracket.

• Just make sure the new crank has the same BB interface- Square Taper, ISIS etc....
• Also make sure the cranks are the same length as the old ones (170, 172.5, 175mm)
• The new cranks may come with the chainring. Double check if you are running 1/8" single speed chain or 3/32"

 

[SSG]

If they're square taper, you can usually pick up a single speed crankset for about $30. You'll also need a puller which isn't expensive.

 

[BackWoodCycle]

My LBS quoted me $100 for them to get me a new crank and put it in.. I think I'd rather just do it myself since the tool is only like $12

 

[user 135]

Looks like that takes a 1/8" chain, 130mmBCD, 170mm length. Probably a crank set of similar quality will cost you about $40.00

http://www.ebay.com/sch/i.html?_nkw=track+crankset&_dcat=109118&Crankarm%20Length=170mm&rt=nc

 

[BackWoodCycle]

Okay sweet thanks