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Author Topic: More on tyres  (Read 5293 times)

Offline retroboy

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More on tyres
« on: June 06, 2016, 12:22:50 AM »
Howdy.
Firstly,  I have a pair of M/T 31x13x15 's (part number 3072) M/T lists them at being 98" circumference. I'm looking to go to a 10.5 or 11" tyre and liked their 31x10.5x15 W (PN 3068W) which they list at 99" circ.  I measured my existing at 5psi on a 10" rim and they measure 100"?. Hoosier list a 29.5x10.5x15 (PN18192)with a 96" circumference which is closer to 30.5" Dia.  How can I buy a set of tyres when the dimensions are all over the joint? What do I believe - is one maker better than the other when it comes to this?
And secondly, Does anybody run M&H Racemasters? They have list the right size for me 10.5 x 30.5 @97" circ (MHR094) but I had a pair in the very early 1980's on a clutch auto equipped FED and they were  inconsistent run to run.
Interested in your thoughts.
Cheers
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Offline wideopen231

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Re: More on tyres
« Reply #1 on: June 06, 2016, 05:13:00 AM »
Not sure I would sweat a 1" or 2 on rollout.Weight would be more concern to me.
As for MT's most bracket race guys that have gone from hoosier to MT swear by them for consistency.
As for tire you ran in 80's .All tires have come a long way as far as hook,consistency and for most part durablity.
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Offline masracingtd1167

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Re: More on tyres
« Reply #2 on: June 06, 2016, 12:59:24 PM »
Before you pull the trigger on that 10.5 w talk to some one about that tire . I am not sure but I think the w tire is meant to go on a wide rim like 14 inches wide !
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Offline buickfed

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Re: More on tyres
« Reply #3 on: June 06, 2016, 06:19:35 PM »
we run m/t 31 x 10.5w-15's at 8.5 lbs. came with the chassis. we don't have any problems, but we don't run big h/p. 350 buick w/162 b&m s/charger. run 10.2's @ 129.
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Offline wideopen231

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Re: More on tyres
« Reply #4 on: June 06, 2016, 06:35:33 PM »
MT spec sheet has that tire with 14" tread width on 10" wheel
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Offline retroboy

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Re: More on tyres
« Reply #5 on: June 07, 2016, 04:22:37 AM »
Thanks for you reply. The 3068W show  10.8 tread in MT spec sheet. Way back when I ran years ago I found the different roll out made a significant difference. So it seems we can't rely on the makers sizing details. Should be easy dia x 3.1428 rather than ignore the stated dia and look at the stated roll out or circumference and hope it's what they say. So does anyone run M&H racemasters these days?
Cheers
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Offline wideopen231

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Re: More on tyres
« Reply #6 on: June 07, 2016, 06:43:05 AM »
ok got into wrong colum running down list its section width I saw.
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Offline Scott Krieger

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Re: More on tyres
« Reply #7 on: June 08, 2016, 10:24:27 AM »
We run the M/T 3062W. The W is for stiff sidewall tire. The next size down from the 3068W your liking.
We've put almost 500 passes on  them over 3 years on a 10" rim and there amazing. This weekend in Fontana, Calif. temps from a low of 103 and high of 111. Track temp from 130 to 145. In nine passes car ran from a 7.211 to a 7.196 1000' numbers.

We just got a new set of the 3062W to run on 12" rims. Ran them one tnt & race in LV so far. Race was called after 4th round because it was cold and guy's were having a tough time getting down the track. Our 3rd (left lane) & 4th (right lane) round wins were the exact  numbers to the 1000'. 9th & 10th pass on new tires.

I went with the 62's over the 68's because of the shorter sidewalls, for less movement. Same as stiff sidewalls, less movement. 
And throw gear at it to make her happy RPM wise. The 62's put a lil more tire on the ground and weight less. 12" rims this time around puts a extra 1/2" of tire on the track and will have less tire growth to control it.

You'll like the 68's and more importantly the car will. just keep her on jacks when resting :)
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