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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-27-10, 10:30 AM   #1
Bat56
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Are all 42T chainrings the same outside diameter?

I replaced an old aluminum 42T chainring with the stainless Surly. Now my back wheel sits forward enough that I might need to add a link to the chain. What I am saying is that the wheel used to be pretty much centered in the drop outs (not track drop outs) and now it sits way forward. Here is a before shot, I do not have an after shot.

My math is telling me that the OD of the chain ring should be the same... but I'm no math man.
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Old 05-27-10, 10:58 AM   #2
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they are with very slight variation due to teeth shape.
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Old 05-27-10, 11:22 AM   #3
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also, an old/worn out ring (esp. alu) will have some wear.
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