Are the dedicated comp tires made to work better when squeezed onto narrower rims than street tires? I ask because I am l looking at BFG Rivals and the smallest size is a 205, so I am wondering if those aggressive types of street tires will play nice on the stock 15x6 fronts.Some of the 93-5 MR2 autocrossers in stock class used to put 225/45/15 Hoosiers on the stock front 15x6 and 275/35/15 on the 15x7 rear. Hoosier A6's are wider than street tires. Now THAT was a squeeze. I quit auto crossing my 93 before those 275s were released. I just ran the 205/225 setup on the stock sized rims. They were probably as wide as 225/245 street tires.
I'm wondering if 225 street tires will even stay on the rim. I think they would feel "squishy", or unresponsive. I put 245 R-S4's on a 7.5" rim and they were looking like they wanted to eat the rim, though they felt okay.The Hoosier and other R compounds have stiffer sidewalls, so they would probably be better if squeezed onto a more narrow rim than the recommended range. So that is the question, would a 225/45/15 street tire have more grip on a 15x6 than a 205/50/15 ? And same for the 245/40/15 on a 15x7 - better than the 225/45/15 ? I would think the wider the tire gets on a particular rim beyond the recommended range, the more diminishing return it would have. But would it ultimately be better ? That is the question. I was hoping someone would chime in and say - yea, I used the 205/225 setup and switched to the 225/245 setup. Maybe someone will need to run the same car one way and then try the other setup to compare.