Autocross tire fitting assistance

[Sveach756]

Go 275 with an actual 200 rated tire of your choice. RT660 is doing well from what I’ve seen or go re71. I think the grip of the tires will pay off vs trying to get a 295 back there.
Two cents
Shawn

[BrantyB]

Originally Posted by Sveach756

Go 275 with an actual 200 rated tire of your choice. RT660 is doing well from what I’ve seen or go re71. I think the grip of the tires will pay off vs trying to get a 295 back there.
Two cents
Shawn

I've been using RE71s. I'd like to up the ante to Nankang AR-1s (100tw) - big grip. Not available in 285, and I'd like a bit more stagger with 255s in the front than 275s.

[lawren]

I've found that 225/45 front & 255/40 rear Bridgestone RE71Rs on stock 17"x 7" fronts and 17"x 8.5" rear wheels is the fastest. I've also run Toyo R888R's on wider 18" OZ wheels but that resulted in slower track and autocross times (and a little fender rub). My '98 Boxster is stock with the exception of font adjustable LCA's. I think the lower HP car just doesn't like turning the larger/fatter wheels and tires.

[BrantyB]

Interesting. I've never found to have "too much tire". I've autocrossed an NB Miata on 245s and still wanted more!

Originally Posted by lawren

I've found that 225/45 front & 255/40 rear Bridgestone RE71Rs on stock 17"x 7" fronts and 17"x 8.5" rear wheels is the fastest. I've also run Toyo R888R's on wider 18" OZ wheels but that resulted in slower track and autocross times (and a little fender rub). My '98 Boxster is stock with the exception of font adjustable LCA's. I think the lower HP car just doesn't like turning the larger/fatter wheels and tires.