When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
You are very vague in your request. What size wheels do have now, and where does that 285/30/20 live?
More sidewall equates to a greater 'aspect ratio' on your tire spec, going up from 30, to 35, or even 40 if on the front, but no more than that. You still have to take into account of what's on the back re: traction control issues, or just looking wierd from odd tire sizes/aspect ratio front and rear.