5” rims are standard race size.
160 “road” tires often measure bigger than 160 slicks. (Who knows why?)
A 4.25” rim and 150 tire solves a lot of clearance problems, but 150 size tires are limited in choice. Pirelli Supercorsa SC’s are available in this size and, in my opinion, an excellent tire.
Usually serious racers want a 5” or 5.5” rim and 160 or 165 tire.
160 “road” tires often measure bigger than 160 slicks. (Who knows why?)
A 4.25” rim and 150 tire solves a lot of clearance problems, but 150 size tires are limited in choice. Pirelli Supercorsa SC’s are available in this size and, in my opinion, an excellent tire.
Usually serious racers want a 5” or 5.5” rim and 160 or 165 tire.