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Hi, first time posting in this forum. Searched in archives and couldn't get an exact answer. Just purchased an 03 epic frameset and installed 8 spd XTR M-950 crank and bb set. Come to realize that the largest chainring comes very close to chainstay about 1/8". I'm worried that chainsuck will tear up the chainstay. The spindle installed is 116mm and Specialized installs 133mm on their complete bikes. I just want to know if anyone here done this before and if you had issues. Any help would be great.

Thanks

Tino
 

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Tino,
I haven't used this exact setup, but you should be fine. An eighth of an inch is plenty - and chainsuck will tear up the stay no matter where the rings are. That's all up to ring and chain wear, and a bit of proper derailleur adjustment, anyway. As long as all the rings have clearance, you should be good.
Remember that the new XTR BB is a through-axle design, so the measurement will be longer than the first, splined XTR BB's. 116mm was the longest 950/952 made - an Ultegra or 105 118.5mm might work, if the shell is a 68. I'm thinking that Specializeds are 73mm, though, so the 116 will have to do.
Jon.
 

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Discussion Starter · #3 ·
jw25 said:
Tino,
I haven't used this exact setup, but you should be fine. An eighth of an inch is plenty - and chainsuck will tear up the stay no matter where the rings are. That's all up to ring and chain wear, and a bit of proper derailleur adjustment, anyway. As long as all the rings have clearance, you should be good.
Remember that the new XTR BB is a through-axle design, so the measurement will be longer than the first, splined XTR BB's. 116mm was the longest 950/952 made - an Ultegra or 105 118.5mm might work, if the shell is a 68. I'm thinking that Specializeds are 73mm, though, so the 116 will have to do.
Jon.
Thanks Jon for the info...
 

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The largest chainring usually won't get chainsuck. Chainsuck typically will happen on the middle or smallest chainrings as the chainrings get worn/muddy or the chain is not lubed.
 
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