Very interesting,i thought the 18 would be lighter and it would be better around a tight motorcross track - looks like i might be best changing to a 19 inch in time (prefer original anyway) if the only main advantage of the 18 is in a rocky desert - none of them around here - as murphys law would have it,its the front hub that really needs replacing with its shot spokes,the 18 rear in good condition,cheers