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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...
ExxWhy's avatar
ExxWhy
Explorer
Jan 28, 2014
Looking at the revolutions per mile, the 20's are at 673 and the 18's at 681. Just a bit over 1% which is negligible to me. Speedo would be about 1 MPH slow @ 60 along with a correspondingly small change in effective gear ratio. (3.50 ish) I think you'd be hard pressed to tell any difference. Info from tirerack.com

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