LakeCowboy

What are the largest ko2's you can run on a stock setup with 20x8.5 rims?

BassAckwards

Needs an 8" rim. Can you mount it on a 7.5" rim, yes. But for liability reasons my company and others will no longer do it.

You could run any 20" tire size they currently make.

stxhunter

^^^

Yea, I'm thinking of going with 275/70 cooper st maxx now as it allows for use with the 7.5" rim and that particular tire is still 11.1" wide.

SNOW.

Did lots of research on this a year ago on my FX4 and ended up with 305/55R20 DuraTracs on 20x9+18 wheels. No lift, spacers, etc., only minor trimming of the front air dam and mudflaps (if one has them) was required. Pics at link in signature...