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dirtdivaca's avatar
dirtdivaca
Explorer
Jan 26, 2014

Going from 20" to 17" -18" wheels - better tow capacity?

We are newbies and getting our first trailer soon – yay! We discovered our 2005 F150 Supercrew has 20” aftermarket wheels (Toyo Proxes ST II 285/50R20 ). Looking over the Ford Towing Guide, it says GC...
MFL's avatar
MFL
Nomad II
Jan 27, 2014
Due to the lower profile, of the 20" after market tires, there wouldn't be a big advantage, going back to stock. There would be less than 1" in diameter difference. The 20s would be 31.2"s tall, compared to stock 18s at 30.5.

IMO, the gain would not be worth the cost. If there would actually be 2"s height difference (which there is not), it would make a noticeable gearing change.

Jerry

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