General question about tire dimensions

emax

Grenadier Ordered
I have read about 35" tires and don't understand the numbers.

Here in Germany, we have e.g. 17" tires in the Grenadier configurator. Seems, that tire dimensions use different measures in the USA and in Germany.

Can somebody shed some light on this?
 

Spjnr

Reservation Holder
Founding Guard
35" tires refers to the diameter of the tire from tread to tread, whereas the 17" is the wheel diameter. 

a 35/12.5/r17 translates to 35", and that tire would be on a 17 inch rim
 
emax said:
I have read about 35" tires and don't understand the numbers.

Here in Germany, we have e.g. 17" tires in the Grenadier configurator. Seems, that tire dimensions use different measures in the USA and in Germany.

Can somebody shed some light on this?

You can type into google "convert ----" and it will do the conversion for you, either from metric to "inches" or "American" or whatever we call it, or you can convert in the other direction. You can also google "tire converter" and it will take you to a page that will look something like this (below) where I have entered two different metric tire sizes for conversion.

The American system is to refer to a tire by its height (i.e. diameter), then its width, then the wheel size. So "35 x 12.5 R17" is a tire that is 35 inches tall, by 12.5 inches wide, on a 17-inch wheel (wheel size directly impacts how much sidewall you have, when controlling for tire height). Having been raised with the American system, I find it much more intuitive than the metric system. What a shock ?

The top image is for the stock tires on the Grenadier - on 17-inch wheels (you will probably be able to order a Grenadier on 18-inch wheels as well). The second image is converting the metric equivalent of a "35-inch" tire (315/70/R17) to inches.
 

 

d1rty

Founding Guard
Side note, the "inches" sizing is often refered to as "flotation" sizing, and it popular for large truck sizes - based on legacy use cases of wanting to "float" over soft soils and such.
 
Did a little investigation and the Bridgestones are not exactly correct but close.

RimTypeBrandModelSizeModel SizeDiameterWidthRim RangeMeasured RimTread DepthLoad RangeMax LoadMax psiMax SpeedWeightSidewall LettersRevs/Mile17''SteelBridgestoneAT265/70R17 116SLT265/70R17 112/109Q C BSW 31.6" 10.7" 7-8.5" 8" 15/32" C - 6 ply 2470 lbs 50 psi 99 mph 42 lbs Black 65817"SteelBFGoodrichT/A K02265/70R17LT265/70R17 121/118S E RWL 31.6" 10.7" 7-8.5" 8" 15/32" E - 10 ply 3195/2910 lbs 80 psi 112 mph 53.4 lbs Black/White Option? 65718"SteelBFGoodrichT/A K02255/70R18LT255/70R18 117/114S D BSW 32" 10.2" 6.5-8.5" 7.5" 15/32" D - 8 ply 2835/2600 lbs 65 psi 112 mph 50.9 lbs Black 64817"AlloyBridgestoneAT265/70R17 116SLT265/70R17 112/109Q C BSW 31.6" 10.7" 7-8.5" 8" 15/32" C - 6 ply 2470 lbs 50 psi 99 mph 42 lbs Black 65818"AlloyBridgestoneAT255/70R18 116SP255/70R18 112S SL OWL 400 B B 32.1" 10.2" 6.5-8.5" 7.5" 14/32" Standard Load 2469 lbs 44 psi 112 mph 43 lbs Black/White Option? 649
My choice will be the 18' K02, it seems to have the sweet spot on build and load range. Stiff but not hard like the 10 ply tires.
 
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