BB size??
01-23-08, 03:32 PM
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RoadRash
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BB size??
I have a shwinn world sport that i converted to a fixed gear,a dn i just picked up some new cranks, now I need your guys help on how to find a proper size BB for square taper cranks, any help would be appreciated. here is a pic of the bike.
01-23-08, 04:13 PM
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01-23-08, 05:06 PM
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But what diameter and will a 107 give me a decent chainline? or is that stuff usually is standard.
01-23-08, 05:18 PM
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you'll need a standard english (68mm) bottom bracket in whichever length. since you say you need 107mm, get a Shimano UN-54 107mm cartridge unit. they are cheap and do the job quite well.
01-23-08, 07:45 PM
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What rear hub are you running?
01-23-08, 08:32 PM
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68mm is the diameter of the bottom bracket. 107mm is the length of the crank axle/spindle.
Most bikes will be 68mm with a 24 tpi (threads per inch) bracket. Also known as the English bracket.
You can get old style bottom brackets that are cups, ball bearings, and the axle. The axle can be had in different lengths. Axles come with three sections and the middle distance must be the right one for your bottom bracket or the bearings won't be happy.
As usual, Sheldon Brown has the answers; go check out his website.
https://sheldonbrown.com/chainline.html
https://sheldonbrown.com/harris/botto...ets.html#axles
Most bikes will be 68mm with a 24 tpi (threads per inch) bracket. Also known as the English bracket.
You can get old style bottom brackets that are cups, ball bearings, and the axle. The axle can be had in different lengths. Axles come with three sections and the middle distance must be the right one for your bottom bracket or the bearings won't be happy.
As usual, Sheldon Brown has the answers; go check out his website.
https://sheldonbrown.com/chainline.html
https://sheldonbrown.com/harris/botto...ets.html#axles
Last edited by bbattle; 01-23-08 at 08:40 PM.
01-23-08, 09:59 PM
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Originally Posted by bbattle
68mm is the diameter of the bottom bracket.
