Spare tire requirements
Last year I got a set of Rickson steel 19.5" SWR style wheels and 245/70R19.5 tires. A set of 4. Now I'm looking into the spare. My current spare is a stock 2006 Dodge wheel and tire, neither of wh...
Forum Discussion
I'm running Toyo M608Z 265/70R19.5
Their website says the tire is 34.4" diameter and 602 revs per mile.
However, checking math here, a 34.4" diameter tire has a circumference of 108.1". One mile is 5280 ft. Doing the math;
108.1" goes into 5280 ft 586 times, or, 586 revs per mile, not 602. To get 602 revs per mile, the circumference would be 105.25" or 33.5" diameter tire.
So, did Toyo mis lable their diameter and it should be 33.5" or did they mislable the revs per mile and it should be 586?
The difference is a 34.4" tire compared to a 33.5" tire.
A handy size for each is;
33.5" diameter tire; 305/70R17
34.5" diameter tire; 315/70R17
I'll be wanting either a 305 or a 315 tire depending on which spec from Toyo I use; their diameter or their revs per mile.
Stupid tire manufacturer's website and their inaccurate data...
I guess I can mark my sidewall, roll exactly one rev and see if it's 105" or 108". Should be obvious...
Their website says the tire is 34.4" diameter and 602 revs per mile.
However, checking math here, a 34.4" diameter tire has a circumference of 108.1". One mile is 5280 ft. Doing the math;
108.1" goes into 5280 ft 586 times, or, 586 revs per mile, not 602. To get 602 revs per mile, the circumference would be 105.25" or 33.5" diameter tire.
So, did Toyo mis lable their diameter and it should be 33.5" or did they mislable the revs per mile and it should be 586?
The difference is a 34.4" tire compared to a 33.5" tire.
A handy size for each is;
33.5" diameter tire; 305/70R17
34.5" diameter tire; 315/70R17
I'll be wanting either a 305 or a 315 tire depending on which spec from Toyo I use; their diameter or their revs per mile.
Stupid tire manufacturer's website and their inaccurate data...
I guess I can mark my sidewall, roll exactly one rev and see if it's 105" or 108". Should be obvious...
