Just wondering, i have the x rex's & love them for racing xc. But the fronts are 21's but measure a bit under 20" & the rears are 20's & measure a bit under 19". Do all tires measure like this such as the holeshots & razr's? Just wondering if i should go with 23" f & 22" rear for the ruts. I figure those would measure out at just under 22" & 21" respectively. Thanks for the input!