MarkR wrote:165/55 17 was standard fitment for the RS250, which ran a 5.5" rim.

Only slightly wider than a 160, but may have helped with chain clearance.

I have JUST enough clearance with the 170/55 and Narrow DiD chain. 2-3mm.

Will start to ride it next week once my new front tire shows up. Then for my hot summer months, i will upgrade it with Tyga parts. Just need to settle on an exhaust system...