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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...
JIMNLIN's avatar
JIMNLIN
Explorer III
Jan 27, 2014
Looking at tire sizes/diameters/tire weights shows the OEM you mentioned;

P265/60-18" is 33" diameter at 39 lbs.

P285/50-20" is 31.2" diameter at 38 lbs.

P255/70-17" is 31.1" diameter at 38 lbs.

Because of the high geared 3.55 axle I would stick with the shorter 20" P tires you now have on your truck.

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