225x45x17 on front 17s

[thstone]

You can even fit a 235 on the stock front wheel (if the tire of your choice doesn't come in a 225).

Boxster race cars run with a set of rear wheels also on the front to get 255/40/17 on all four corners. But you'll need adjustable sway bars to dial out the oversteer (because that front end has huge grip with a 255 up front). I repeat, don't do this unless you have adjustable sway bars or it will drive like a drift car.

[The Radium King]

Originally Posted by thstone

You can even fit a 235 on the stock front wheel (if the tire of your choice doesn't come in a 225).

Boxster race cars run with a set of rear wheels also on the front to get 255/40/17 on all four corners. But you'll need adjustable sway bars to dial out the oversteer (because that front end has huge grip with a 255 up front). I repeat, don't do this unless you have adjustable sway bars or it will drive like a drift car.

from what i've found, 225 front good match for 255 rear, and 235 front goes well with 265 rear. about to try 245/275 next.

[Lapister]

Thank you guys, the PO had put Yk580 on fronts probably just to sell the car before me. Rears came with Sdrives. Just want to match tires but with better grip up front.

[BYprodriver]

Originally Posted by The Radium King

from what i've found, 225 front good match for 255 rear, and 235 front goes well with 265 rear. about to try 245/275 next.

I wouldn't put 275/35 on the rear with 3.2L or smaller due to loss of torque multiplication.

285/30 is slightly shorter than 265/35 & works well as long as you use 10" wheel & there's no clearance problems.

[Topless]

Originally Posted by BYprodriver

I wouldn't put 275/35 on the rear with 3.2L or smaller due to loss of torque multiplication.

285/30 is slightly shorter than 265/35 & works well as long as you use 10" wheel & there's no clearance problems.

275/35/17 actually works just fine on a Boxster if you are going for 245/275 stagger. The diameter is 24.7" so even a bit shorter than a 255/40/17.

http://www.tirerack.com/tires/tires.jsp?tireMake=Hoosier&tireModel=R7&partnum=735ZR7R7

[BYprodriver]

Originally Posted by Topless

275/35/17 actually works just fine on a Boxster if you are going for 245/275 stagger. The diameter is 24.7" so even a bit shorter than a 255/40/17.

Hoosier****R7

Oh, I was talking 18" I thought that's what Radium King had.

[The Radium King]

Originally Posted by BYprodriver

Oh, I was talking 18" I thought that's what Radium King had.

hah, i do. here are my calcs for an 18" wheel (i was trying to ensure front/rear height differences were under 3% so as to not mess with ABS):

225/40 (25.1) 265/35 (25.3) OEM
235/40 (25.4) 265/35 (25.3) current
235/35 (24.5) 265/35 (25.3) 3.3%
235/35 (24.5) 265/30 (24.3)
-
245/35 (24.8) 275/30 (24.5) proposed
245/35 (24.8) 275/35 (25.6) 3.2%
245/40 (25.7) 275/35 (25.6)

ps, sorry for the hijack to the op.