Firestone got me a good deal on a set of Pirelli P7 Cinturatos. Very soft and very quiet. I have 18s, but I would imagine that would be good for 20s as well.

Firestone's Lifetime Alignment is a good deal too.

 

I've switched to Conti DWS on my M3; sofeter and quieter all season tires

My 07 XJR came with 19" Conti exteme contacts(?); will go with DWS soon

 

well I went ahead and had them put a set of 255/35s on it since that's all they had on hand at the shop. They are Sumatomo brand (never heard of em) but they are pretty meaty and seem to ride quiet and a lot smoother than the old ones. Luckily I'm going to b able to return the Nittos, and the Sumatomos were a bit cheaper so after I pay return shipping and all is said and done ill have $20 left over for my time lol I'm still interested in putting bigger ones on next time but for now my Jag fund is going to be spent on suspension replacement as every rubber boot or bushing looks like they're 100 years old lol

 

Just try this tyre calculator Visual Tyre Size Calculator | Kouki Tech it will help you decide also the speedometer is out on these car with a gps you can calculate what tyres to make it exact although on my car the tyres needed did not exist worth a try

 

Did someone change wheels settings in IDS/SDD? How that affected car feel if any?