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Track chainring bolt length

blorg · 2010-04-14 16:48:20

Went about swapping my chainring to a slightly bigger one, moving from a PX 48T to TA 49T. It appears that the new one is not quite as thick where it screws on to the crank. It looks like under 1mm difference. Both are 1/8", this is just at the bolt holes. The result seems to be that the bolts bottom out and just spin…

14-04-2010 5:48pm

#1

blorg

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Went about swapping my chainring to a slightly bigger one, moving from a PX 48T to TA 49T. It appears that the new one is not quite as thick where it screws on to the crank. It looks like under 1mm difference. Both are 1/8", this is just at the bolt holes. The result seems to be that the bolts bottom out and just spin while leaving a bit of play on the crank. I am using a chainring nut wrench on the back but they just spin.

Do track bolts come in different lengths? Do I just need shorter bolts/nuts or am I doing something else wrong.

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