Rear sprocket fit

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wheelhorseman

wheelhorseman

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I got this old Sears for the rear rim.It has a standard snap ring cog 18t that I wanted to change.That cog seems to have a very slightly bigger center hole and other standard cogs wont fit. I have never encountered this before. They have always interchanged. What gives?

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B/c Bendix have a bigger bore... but you can usually bore out a Shimano/Sturmey to fit, if you're patient and take care to leave the 3 nubs...
 
I dont think its Bendix. Kinda looks like it ssys Tiawan on brake arm. I will take pic of arm today.Besides I thought Bendix cogs were flat.This one is dished like most others.

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