[Ron Sutton]

Originally Posted by Track Junky

Now the dilemma......I have chosen a big ass 345 to handle the rear load but what size up front. IMO smart money goes with the widest I can get that will compliment the rears and I dont believe 285's are going to do it. Reason being I used to run 275's all around and had my car neutral. When I mini-tubbed my car and installed 315's out back just for the cool factor the car began to push. I'm still working on getting my car neutral again.

This is what I see all the time. If you think about your previous car in contact patch comparisons with 315's with approximately 11.8" of tread on the rear ... and 275's with approximately 10.2" of tread on the front ... your rear tires had 15.6% more grip.

You had a balanced car ... and added 15.6% more grip to the rear. They only way to fix the handling balance ... without swapping tires ... is to adjust the suspension to reduce the rear grip by 15.6%.

That's a lot. I know firsthand, because I've done it ... and it takes BIG spring, sway bar & roll center changes to achieve.