Pizza Cutters?

[255/85]

Toyo and BF Goodrich have 34x10.50R17 options. Both are all-terrains though.

 

[Tinerfeño]

Yes, the calculated diameter based on the metric sizing is 1/2" less than the manufacturer's specified diameter.

Based on what?

Metric sizes are pretty accurate on dimensions just allowing some tolerances. For example the width of a tyre is measured on one specified wheel width, with a narrower wheel the width (measered from tyre sidewalls) will be less and with a wider wheel more.

The diameter is not straightly visible in the nomination. It is calculated by 2 x nominal width x profile + wheel diameter. In this cese:
2 x 255 mm x 0,85 + 17" x 25,4 mm/" = 865 mm, which is 34,1".

 

[snowball]

Spec's from Mickey Thompsons website

 

[Tinerfeño]

Seems to show double dimensioning: 255/85R17 and 35x10.00R17 and most probably has been manufactured to later of these.
Does the tire has also double markings on sidewall?

 

[TCMColorado]

Based on what?

Metric sizes are pretty accurate on dimensions just allowing some tolerances. For example the width of a tyre is measured on one specified wheel width, with a narrower wheel the width (measered from tyre sidewalls) will be less and with a wider wheel more.

The diameter is not straightly visible in the nomination. It is calculated by 2 x nominal width x profile + wheel diameter. In this cese:
2 x 255 mm x 0,85 + 17" x 25,4 mm/" = 865 mm, which is 34,1".

Per the specs from Mickey Thompson the actual inflated diameter when unloaded is 34.6”. The calculated diameter based on the metric size is indeed 34.1”. That is a difference of .5” or 12.5mm. That variance is more than a “tolerance” .

 

[TCMColorado]

Toyo and BF Goodrich have 34x10.50R17 options. Both are all-terrains though.

The BFG in this size is comically under sized. I have measured the actual diameter at 33”. This was at a pressure of 30 psi with the wheel/tire horizontal on the ground with no load and measured at the center of the tread face.

 

[Revelstoke]

I wasted little time swapping out the OE KO2's for Toyo Open Country III's in a 255/80R17...had no issue selling the BFG's which made it all a little financially easier. Appreciate the additional 1/2 inch or so of ground clearance. Have had both types, although differing sizes, over the past few years on other vehicles and found the Open Country's offered better snow performance overall for at least the first season or so which is a priority in my neck of the woods. On a side note; the Toyo's balanced out tremendously better requiring a quarter of the wheel weights that were with the BFG's!