Opinion: 26 vs 27.5 vs 29-inch Wheels - Pinkbike
I only use 650b in really loose conditions as I see the extra cornering traction and stability is where the advantage is. Most Bike mag comparisons appear to be based on rollover. The trail they rode seems biased towards rollover rather than cornering traction.On those trails I'd come to the same conclusion that they did. Stick with 26" or 29", which is what I do most of the time.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Pink Bike wheel size comparison