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More product description: But the shifting will be very poor if you do that. The bolt circle defines the minimum number of teeth that can be had in a chainring. Sugino Mtn: 42 tooth, 110mm BCD, chainring. Most of these rings are now Campy 10 speed compatible. For what it's worth, the Bianchi Bergamo uses a single, 32-tooth chainring. 39 teeth is the smallest that will fit on the 135mm bolt circle. The TA rings have pins for lifting the chain, but since you can choose from many chainring combinations, the three rings you end up with won't be matched for tooth position or pin position. TA chainrings also have a few advantages.
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