A 160 section tyre will go, but it's not ideal on a 5" rim, and doesn't suit the NSR's handling balance.

The rim ideally needs to be 5.25" (i.e. HRC, RS, or equivalent). The 5" rim "squeezes" the side-walls of the tyre in and raises the profile too much.

The same goes for a 120 section tyre on the front rim. Using a VFR rim will allow for a 120 section, but the NSR works so well with a 110/150 combination, it's pointless changing.

The real benefit to the larger rim sizes are to be had on the track. As race slicks don't come in the same sizes as road tyres (the slicks are always a little larger), the extra rim width is neded to keep the profile correct.

Andy.
NSR-WORLD.COM