305/40/18 on a 9.5 wheel ?

[214Chevy]

Originally Posted by BBC71Nova

With a low profile tire I think it is even more critical to stay within the range. There just isnt that much sidewall there to perform the transition.

I'm running into similar problem while shopping for wheels and tires too. Unless you can spring for a uber pimp forged wheel it is hard to find many at 10" width. Who wants to spend the time and money on a minitub and put a 285 tire in there on the 9.5" wheel. Vintage Wheel Works now has an 18X11 wheel out though. Problem then is tires. Seems limited in the 305/35 - 315/35 range for 18" wheels. Oh the joys of project cars

As others stated, stay within tire manufacturers specs. In reference to BBC71Nova, yes...it becomes less choices out there when you venture into tire sizes above the 300 plus sizes. Also, rim size choices are slim too with 10" wide as many older cars won't allow a 10" rim. Our cars were built on the platform of 7" and 8" wide tires in 14" and some 15" diameters. Not 10" widths with 18", 19" and 20" diameters. Therefore, the only other option as you've stated is to fork over $5-$8k for the forged wheels and custom fit everything. That's the down side of things.