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edscoble
jameso
I get it .. It was explained to me as, with bigger tyres (and ISO regs on clearances) the FC can't get too short so for smallest size the reach at a given HTA has a min limit, then if the stack at that min FC increases for the next size up the reach gets shorter (or to where many M bikes would be) so one way to adjust fit on the smallest bike is use stem length. Which is ok if you don't change the stem. On the next size up you're free to add reach and stack and it's all in normal ranges.