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Are 8 and 9 speed chain rings the same thickness?(2 posts)

Are 8 and 9 speed chain rings the same thickness?mrthurnt
Sep 30, 2002 12:27 PM
I am riding 9-speed chain rings with an 8-speed cassette and chain. Is this going to quickly wear out my chain rings?

Also, I am useing a 9-speed derailure. No prolems yet (I ground the cassing down to provide chain clearance), but should I put an 8-speed derailure on if I can find one?

Finally, can I use a 9-speed chain with this set up (8-speed cassette and front derailure / 9-speed rear derailure and chain rings)?

Thanks - matthew
yes, but not spaced the same....C-40
Sep 30, 2002 2:07 PM
Shimano moved the little chainring closer to the big chainring when 9-speed was introduced. The chainrings are not narrower.

If you are using a 9 speed derailleur, you should use a 9 speed chain, which is narrower, then you wouldn't have had to grind the derailleur for clearance.

From the Brandford website:

For best shifting use Shimano's 8 speed cassettes with a Shimano 8 speed rear derailleur and a Dura-Ace, Ultegra or Rohloff 8 speed chain. If you are using a Shimano 9 speed rear derailleur then use a Dura-Ace, Ultegra or Rohloff 9 speed chain.

Personally, I would never invest much money in old technology. Your 8-speed shifters are probably pretty old. I'd change the shifters and cassette to 9 speed if either one wears out. The 9-speed cassette will fit on your 8-speed hub, by the way.