Hello everyone,
I am considering a wheel upgrade for my 89 635csi 5spd turbo. The car currently has 225-50-15 all the way around on borbet type h wheels with the hub centric ring. The car has developed a bad vibration between 80 and 120mph, I have a feeling it is due to a bent wheel or possibly the hub rings are becoming rusty. Ebay has a set of wheels I was considering. What would be the largest recommended tire size to fit on these? I need as much tire in the rear as possible as it is hard to keep 1st and 2nd from spinning at any boost level right now. I was thinking 235-40-17 in the front and 255-40-17 in the rear bfg g-force tires. Any thoughts or experiences are appreciated.

http://cgi.ebay.com/ebaymotors/17X8-5-CHROME-RIM-WHEELS-BMW-5-6-7-8-SERIES-SET-4-_W0QQcmdZViewItemQQhashZitem5ade33606bQQitemZ39027 4965611QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries