94 inch circumference Hoosier tires.

[Kdw1403]

Anybody ever switched from 94 inch rollout to 92 inch tires rear tires? How much rpm change did you notice? Was it a good change or bad change. Any et change? My combo is LT1.

[Jim Kaekel]

I do occasionally, 92.5" to 94" Hoosiers. About 150 RPM higher with the shorter tires.

[Stan Weiss]

Originally Posted by Jim Kaekel

I do occasionally, 92.5" to 94" Hoosiers. About 150 RPM higher with the shorter tires.

Just looking to see how close theory comes to actual measured results.

► 9250 RPM * (94 / 92.5) = 9400 RPM

Stan

[Rob Petrie E395]

I have a LT1 car. When I originally built it I thought I wanted the biggest tire I could fit. So I put the 94” on it. I’ve since been told I should have the 92.5” with my 4.88 rear gear. So I’m switching.

[MR DERBY CITY]

Originally Posted by Kdw1403

Anybody ever switched from 94 inch rollout to 92 inch tires rear tires? How much rpm change did you notice? Was it a good change or bad change. Any et change? My combo is LT1.

Kdw, I am sure that the majority of class racers have tried both the 92 and 94 inch tires. The rpm difference will be 150-200 …As far as ET , there are so many variables from car to car…..is your first gear a 2.52,2.75,2.85,2.91 ??? The same holds true for rear end gear …Weight of car could also determine what tire it likes. It’s something you just have to try at the track …

[ss125h]

have changed 92" to 94" many times, on two stockers, I and J auto, adds up to 200 rpm in the traps with 4.86 gear. Glen H 1257

[Willyracer]

Hoosier Rep told me a rule of thumb is 100 rpm for every
Inch of roll out. So 92 - 94 2 inch difference 200 rpm
Looks like from the other posts he was correct