I am running 30" hoosiers. I was thinking of trying some 31" DOT's or some M/T 31". Has anybody tried the 31" tall tires?
Thanks
Mike

 

I forgot to mention these are 15" The 31" tires add 7% I don't know if it would help me or hurt me!!
Mike

 

with 3.73s, what gear ratio would that make it???

 

The taller the sidewall of a wrinkle wall tire.. the greater the rolling resistance. Also the less effective gear ratio you'll have.
Your loosing energy in trying to turn them and you won't have as much torque getting to the pavement. However... if you stand to gain enough off the line punch? Then it might be worth it? Are you spinning what you currently have?

BTW: I have 31.2" tall nitto 404s. The are noticeably harder to spin than were the 28" tall F1s. (wheel assembly is only 1# heavier)

Rich

 

What kind of power are you making? At my power level I have tried about 5 different sizes from ~26-30 and my best times have come from 28" slicks. This would change though if you had a built motor with a KB/etc.

 

I launch around 1800 and have 1.50 60' times. If I try to launch much harder, I spin. I currently run around 124mph in the 1/4 My calibration would change the 3.73 to about a 3.50 One of the drawbacks I see is the 30" hoosiers weigh 26lbs and the 31" MT's weigh 33lbs.
Mike