Thinking about putting some 20/9 rims in the front and 20/10.5 on my 2010 xfr. Question has anyone put this rim width with 285/30/20 on the front. Rear tires are new so id like to keep them and want the wider rear rim so I can put more tire there. Thanks Gents I appreciate all the wisdom you share
any offset recommendations are also appreciated

 

go to a tire shop and have them figure it out for you. you are pushing the limits with an 11'' wide front tire.. the height will fit as slightly shorter than 255/35/20, but you'll likely rub fender liner at close to full steering angles
also, and for me a larger issue, you are putting a 30 series sidewall on the front and you'll bend the wheel even easier as that a lot of weight to crash into bumps and potholes.
do you need that wide on front? Jag doesn't think so.. on any of their cars. widest they put on front is 265

 

your set up looks pretty the rims I want are 10.5 and 9 what would you put on them for tire size? want to fill the wheel wells and have a wider tire for traction out back

 

I would stick with either 255 or 265 width front in a 35 series on a 20" wheel

For rear, a 295/30 if paired with the 255 width front and a 305/30 is paired with a 265 width front

You'll find these tire section width within the allowed / recommended range for those wheels you intend

The main driver for me to match as such would be tire height matchups. The stock xfr setup has a slightly taller front tire than rear with the 255 front and 285 rear

If I had to do the whole thing over again I might go with a 19" setup and a 40 series front / 35 series rear sidewall for reasons of bent wheels due to potholes.

I intentionally skipped addressing your offset woes. See a tire shop and make that their problem. I rolled my rear fenders b/c I had rubbing on launch or big bumps with the wheels I have and 295 width tires

 

yea I have battled a few realignments over pot holes here in Wisconsin thanks for your feedback

 

I have 21s on my 2015 ss and 19 and 21 inch tires are crazy money though