Originally Posted by tomtomtom123

I want to be able to have a larger gear range with a double chainring set. A single chainring is limited. With 11-28T 10 speed cassette and 46/28T chainrings, gear inches would be around 19-78" (with 406 1.75"tires, or x2.5% with Big Apples). It would provide 418% range with 15 unique steps. I would prefer 48/28T or 48/30T to increase the high to 81", but I've been told I won't find a 48T middle, unless someone knows of one?




For 5 bolt, 28T only commonly comes in 74 BCD, which can only be found on a triple crank in combination with 110 or 130 BCD, except for some really special and expensive models, like $300-400. The largest middle ring I could find is 46T in 110 or 130 BCD but only from 1 or 2 suppliers like TA Zephyr or Alize and Spa Cycles. I've been told that I can't use the more commonly available 46T or 48T outer ring for the middle position on a triple crank because the inner side without counterbored holes will make the bolt heads stick out and hit the chain when the chain is on the inner ring. Otherwise I would have wanted to go for the 48T. Or is there some solution for getting an outer into the middle position?