From what I hear the Parker DT rear is an excellent tire for our local terrain. However the smallest size it comes in is 110/100-18 making it about 1/2" taller than stock. The smallest Trackmaster is about 0.15" taller than stock. My dad has fairly short legs so we installed a shorter seat and lowering link to make it a bit more manageable. Just trying to avoid making the bike any taller than we have to.