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.mo.-
there was nothing wrong with 26"
The thing that's wrong with 26" is that 29" is definitely faster on an XC bike, particularly the way race courses are prepared. The trouble with 29" is that it's just a bit too big for small people. 27.5" allows manufacturers to rationalise inventory with a one size fits all (medium height people) solution, at the expense of not giving anybody outside the 20th to 80th percentiles the wheels they actually need 🙂
gbj_tester
Despite the industry trying to crowbar a new bike into the space between road-endurance and CX, I do almost exactly the same speed on my mixed on/off road circuit whether I'm on my 7kg/700x25 road race bike or my 15kg/26x2.3 trail MTB.