I finished the EX250 rear wheel/brake swap on my 89 500 today it works great, It was all but a bolt up swap the couple minor problems but easily fixed, If you look at it you can't tell it didn't come that way, while I was at it I resprung and swapped a whole 250 front end also, seeing that for the most part the forks are the same and looking at the spring options availible for the 250 I gave it a try worked out perfect, front end is firm and it handles great. So my 89 500 now has ex250 front and rear wheels front forks and front and rear discs. On a side note the complete swap over shaved nearly 10 pounds off, the only draw back I can see is I lost the 500's 11 inch front rotor and ended up with the 250's 10 inch they share the same caliper and pads though. I took it out and pounded it good and had no problem, it may fade quicker but I noticed no loose of braking power or fade for that matter and I worked out pretty good, I only weight 150 though a bigger person may have a problem. Next up pipe, pods, factory jet and shift kits!