i purchased a 17" 4.5 rear from a 750A got it super laced to my rear stock hub. then i took my 18 inch rear and got that super laced to my front hub. basically i took down the 550 one inch front and back to keep the bike's geometry the same. after all, i'm pretty sure the japanese knew what they were doing when they made these bikes. i sent the work to be done to Woody's Wheelworks (303) 936-0232. now what super lace is they reconfigure the lacing pattern to find the spoke angle that is closest to 90degrees from rim to hub, making them about 5 times stronger each in comparison to the normal pattern. i'm about to get mine tomorrow so maybe i can post pics. they also powder coat or polish. btw, powder is cheaper. polishing is at an hourly rate and understandably so. if you really can't find your rims, they also sell used rims. they probably have a set of 17's front and rear. they also installed new bearings and new tires. so its ready to go. btw, even if you keep the same tire profile, the height is really only a half inch off. now after saying all this, i must say that all this work did cost a $h!t load of money. but since i'm short, i need all the help i can get.