Quote:
Originally Posted by Chris1529
You really need to know what the tire actually measures before you can make an apples to apples comparison. The advertised sidewall diameter isn't what the tire measures.
So, you may go from a 27" tire from one manufacturer to a 28" tire from another manufacturer, but see no noticeable change of ET because the tires may be very close in diameter.
If you are wanting a tire to improve ET, make sure you buy the tire with the largest diameter. You will also have to run more air pressure that the manufacturer suggests to get the most effect from this change unless you have a very light car. And remember to stage as "shallow" as possible and be consistent with your staging.
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Chris,
I agree with it all, but while taller tires do add rollout,
less air pressure also adds to the rollout which should help ET and 60'. On the other hand, a taller tire, particularly firmer with more air pressure, will have to rotate fewer times within a 1/4 mile and have less flex going down the track. But that's getting into tiny variables.