New Wheels!

[wild1poet2]

Originally Posted by RandallNeighbour

Somebody who knows really needs to answer the question about speedo changes when one goes from 17's to 18's. I want to go from 17's to 18's and would like to know if my speedo will need recalibration.

Logically, if the circumference of the 18 inch tire and the overall height of the mounted tire are the same, the speedo should be accurate.

You go to a lower profile tire with the larger diameter wheel to offset the increase so no speedo recalibration is needed. Overall wheel plus tire diameter remain the same. Likewise you maintain your final drive ratio.

[Calliedog]

Everyone needs this tool. Tire and Wheel Calculator. It's simple to use and I think it will answer your questions.

http://www.dakota-truck.net/TIRECALC/tirecalc.html

[Finallygottaporsche]

replicas are almost always heavier than porsche original wheels. you probably aded 10 lbs of unsprung weight to each corner. cars like the boxster are sensitive to this. its like running w ankle weights on. you also have switched to a non porsche appoved tire. im just asking... does it drive well?

[ralegen]

Hey TriGEm,

Your ebay link doesn't show the pictures. Did you have the same wheels as the ones in Jephs' link?

http://cgi.ebay.com/ebaymotors/Pors...sspagenameZWDVW