85 vs 75 tires on dually
I’ve got a 4x4 dually that has stock-spec 215/85/16s on it. (They’re BFG Commercial TAs) Some time this year it’s gonna get new shoes. They work fine but I just think the 215s look wimpy. I’m lo...
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Burning man,
You first need to measure the dual spacing - the distance from the centerline of one tire of the duals to the centerline of the other. My books don't list that, but my experience is that most vehicle manufacturers only spec enough to fit the stock tire.
Then, you need to see how it lines up with these minimums:
LT215/85R16: 9.9"
LT225/75R16: 10.2"
LT235/85R16: 10.8"
The reason I only listed those 3 sizes is that your truck came stock with 6" wide wheels, and only those 3 sizes fit. If you want any size larger, you'll have to buy wheels with both a larger offset and a wider width.
Oh, and operating a vehicle with tires too wide for the rim width results in a "darty" vehicle, sensitive to both the wind and the ruts in the pavement.
You first need to measure the dual spacing - the distance from the centerline of one tire of the duals to the centerline of the other. My books don't list that, but my experience is that most vehicle manufacturers only spec enough to fit the stock tire.
Then, you need to see how it lines up with these minimums:
LT215/85R16: 9.9"
LT225/75R16: 10.2"
LT235/85R16: 10.8"
The reason I only listed those 3 sizes is that your truck came stock with 6" wide wheels, and only those 3 sizes fit. If you want any size larger, you'll have to buy wheels with both a larger offset and a wider width.
Oh, and operating a vehicle with tires too wide for the rim width results in a "darty" vehicle, sensitive to both the wind and the ruts in the pavement.
