20" wheels...reducing tow capacity?

[jmb667]

Hey, all! New here, still looking at what we want out of a TT (I have another thread running asking about possibilities there). But another question dawned on me today as I was reading some other posts: are our 20" wheels going to be a problem?

We have 275/55R20 Toyo Open Country A/T II tires on our Tundra's stock Platinum wheels. These were put on in January to replace the Dunlop sport tires that were on it. But based on my reading, I'm wondering if this is going to give us a problem...and if 18" wheels and tires would be better (or just a new truck, for all the anxiety figuring this all out is causing me).

Thanks again for your help!

[Marsland]

This is just what I have noticed in the Ford pickup brochure. The heavy duty package wheels are 17" and 7 lug. All the other wheels are 18" and 20" and 6 lug. The decreased diameter essentially increased your torque. If you think about it to the extreme a very large diameter wheel needs more energy to turn 1 revolution than a very small one.

In conclusion, to answer your question, yes, the wheel diameter does make a difference.