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More Tire Confusion


masterdrago

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Okay folks, looking at a Forest River Cedar Creek Champagne Edition. Tires say Westlake 215/75R 17.5 load range H 16 ply 135/133J. So looking at the Westlake pages  --  http://www.westlaketire.ca/products/cr960a-2/   I find speed rating J 62mph, single max load 4806# @123psi. The other 215/75R 17.5 is a 14 ply load index/speed rating 126/124M max load 3748 @110psi.

Am I reading right that the 14 ply has an M speed rating making it 81mph from the chart at http://www.tiresplus.com/tires/tire-buying-guide/tire-speed-rating/

1st Time RVer 2018 Montana 3791RD, 2018 Ram 3500 DRW

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That's what I read too. Were it I, I would demand the latter tire. That 62 MPH  maximum speed rating is a constant speed rating. Some tire mfgrs. say to increase tire pressure 10 psi if you plan to drive faster, don't know about the mfgr. of that specific tire.

I do know tire sidewall flex builds heat, which is the major enemy of tires. A stiffer sidewall, operated with less tire pressure builds heat faster than with maximum pressure.

 

2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country.  John F. Kennedy 20 Jan 1961

 

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