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Author Topic: Tire growth  (Read 3656 times)

Offline masracingtd1167

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Tire growth
« on: March 27, 2022, 08:50:55 AM »
Question for Jon ! I am using Th M+ H 12X33 Tire and trying to figure out how much they grow at 185 mph . The tire measures 100 inches at 5 lbs air ! Trying to figure out what gear to put in . I am thinking a 5.00 or a 4.86 ! Not really afraid of rpm this new combination is a 15 degree head rolled over to 11 degrees  and flow much better than my old 18 degree heads  ! Thanks bill !
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Offline gregm784

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Re: Tire growth
« Reply #1 on: March 31, 2022, 04:19:11 PM »
On my combo, i am running a 4.10 gear, the M&H 12.00x16 tire that measures 100.625 at 8psi.  I run 179mph and 8050rpm on my data logger.
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Greg
El Dorado County, CA
www.meansracing.com

Offline masracingtd1167

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Re: Tire growth
« Reply #2 on: April 01, 2022, 03:37:17 PM »
Greg do you think it's reasonable to think they would grow to 103 inches at speed ?
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Offline Rat

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Re: Tire growth
« Reply #3 on: April 02, 2022, 07:17:14 AM »
We had an issue where the numbers didn't add up RPM v MPH, when we we reverse calculated the tire size, they were an inch & half taller than what he tire was marked. We recalculated the gear ratio using the larger diameter, replaced the gear set with the new ratio and the MPH & RPM dead on.
Gregm784, According to the Wallace calculators your tyres are growing to 101.096" or 32.18" dia @ 179 mph
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Offline JEFF/21C

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Re: Tire growth
« Reply #4 on: April 04, 2022, 04:28:35 PM »
How much changing rim width change tire height?
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