Its interesting Dale, you told me you were fitting softer front springs to run these tyres. How is it with a smaller diameter wheel and a tyre with a taller side wall than the 16" you previously had, you have to also fit softer springs? My understanding was the tyre itself plays a small role as a suspension item, so you'd think having the taller side wall would mean the 15" wheels would automatically provide more of a cushion.

Its interesting, reading Mark Donohues book "The Unfair Advantage", when they built their first Penske Camaro in 1967 for the Trans-Am, Donohue wasn't sure what spring rates to fit the the car, so took a punt, and fit 1200 pounds on the front, and 400 pounds on the rear. And he said the car was virtually un-drivable. He became completely disenchanted about it after a few races, and knew softer springs would help the situation, but didn't know what rates to go with.

In the end, after struggling through a few races, he had a few different sets made up. He tried 750 front, and 350 rear, which made an immediate improvement, and in the end settled on 550 front and 180 in the rear, which was a huge difference to those originally fitted.