Farnham runs 4.88 and 295's Paul, and has reported positive results. He sees a lot of Vail Pass action.. also I know Convert ran 4.88's and 285's for some time as well, before switching to 35's. As you know RPM's get a little high on the wide open highway and may limit top speed a little bit, but for the other 95% of your driving it's nice to be a little peppier.
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 06 TW200, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50