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January 31, 2006

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RogueMechanic

Hello Will,
The tooth difference between the rings isn't really an issue as long as the outside ring have a good pin/ramp design. The negative factors of a triple include but are not limited to the need to use a long cage rear derailleur, longer chain, greater chain cross-over angle, and the dreaded downshift into the inner/granny ring... Shimano acknowledged this issues several years ago when they introduced the 34t rear cog....thus avoiding/delaying the need to drop down into the granny and risking the chance of droping the chain and experiencing chain suck. In this case, more parts complicates the issue and has an effect on shifting. I hope that this helps and thanks for writing.

will law

could you explain why a compact crankset will give better shifting performance than a triple? it seems that, because of a greater tooth difference between rings, a compact shouldn't give better shifting performance than a triple.

RogueMechanic

Thanks for your comment Arleigh. When it comes down to it, it's really hard to beat the shift performance of Shimano rings... It's amazing how many times over the years that I had to "warranty" rings mainly because of sub-standard quality and poor design...

Arleigh

I agree on the rings. There were many "warranty" Truvativ rings that came through the shop thanks to shifting issues.

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