10-21-2016, 10:51 AM
My 130 hp K1200RS "only" has a 5" rim and 170/60-17. It handles just fine. BMW offered a 5.5" rim as a factory accessory to allow owners to use a 180/55-17, but nothing I've read claimed it did anything to improve the bike's handling, though it may have increased the GVWR. I think it was more for fashion.
