19 inch track whee set question.
06-25-2019, 01:13 PM
#1
19 inch track whee set question.
My car as it stands now has:
Current Stock:
- 235/35 R20 ET57 8x20
- 265/35 R20 ET45 10x20
Considering OZ Ultraleggera's wheels 19
- 245/35/R19 ET54 = 0.3 inch further out, 3.2% inc in width, -2.6% circum
- 275/35/R19 ET40 = 0.4 inch farther out, 3.8% inc in width, -2.6% circum
TireRack recommends on the same OZ Ultralegerars's
- 235/40 R19 ET54 8.5x19 = 0.12 inch further out, n/c width, circ -0.4% (free rake?)
- 265/40 R19 ET40 10x19 = 0.2 inch further out, n/c width, circ n/c
Rubbing with any of the above set-ups?
The above would be on a 718 with stock regular (non-fancy) suspension that is used for a few DE's a year. No intention of modifying suspension. Will try to max front camber and match rear to front with zero toe in front and maybe ~.10 degree toe-in rear (unsure on the rear toe as of yet)
Current Stock:
- 235/35 R20 ET57 8x20
- 265/35 R20 ET45 10x20
Considering OZ Ultraleggera's wheels 19
- 245/35/R19 ET54 = 0.3 inch further out, 3.2% inc in width, -2.6% circum
- 275/35/R19 ET40 = 0.4 inch farther out, 3.8% inc in width, -2.6% circum
TireRack recommends on the same OZ Ultralegerars's
- 235/40 R19 ET54 8.5x19 = 0.12 inch further out, n/c width, circ -0.4% (free rake?)
- 265/40 R19 ET40 10x19 = 0.2 inch further out, n/c width, circ n/c
Rubbing with any of the above set-ups?
The above would be on a 718 with stock regular (non-fancy) suspension that is used for a few DE's a year. No intention of modifying suspension. Will try to max front camber and match rear to front with zero toe in front and maybe ~.10 degree toe-in rear (unsure on the rear toe as of yet)
06-25-2019, 03:48 PM
#4
Rennlist Member
You'll want 40 series on 19" to keep the same ratios as your existing 20": 235/40R19 and 265/40R19 is the stock size for 981s and 718s with 19s.
I am currently running 245 and 275/40 on my OE 19s with absolutely no issues. 981 Boxster S, DE and AX and daily driver (MPSS).
I have also run 235 and 265/35 on 19s and they drop the car by about an inch; the smaller diameter / circumference aids acceleration (AX) but hurts top speed. I also bashed my lower bumper on my driveway, never an issue with the stock diameter combo.
You should be able to get close to -1.5 front camber with the stock camber plates.
HTH,
Tom
I am currently running 245 and 275/40 on my OE 19s with absolutely no issues. 981 Boxster S, DE and AX and daily driver (MPSS).
I have also run 235 and 265/35 on 19s and they drop the car by about an inch; the smaller diameter / circumference aids acceleration (AX) but hurts top speed. I also bashed my lower bumper on my driveway, never an issue with the stock diameter combo.
You should be able to get close to -1.5 front camber with the stock camber plates.
HTH,
Tom
06-25-2019, 07:17 PM
#5
The GT4 has issues with rear stability under hard braking. I solved that by running more rear toe. Later changed to TPC rear toe links and reduced rear toe a little (still more then OEM). I don't have the settings readily available but can find them if you need them.
06-25-2019, 09:12 PM
#6
Here you go >> https://rennlist.com/forums/market/1149189
You do not need 40 series on 19". I ran these with the 7mm spacers to accommodate the 255 / 285 sizes on my 981 Cayman with no issues. -2.7F -2.2R, front toe out 1mm, rear toe in 2mm
You do not need 40 series on 19". I ran these with the 7mm spacers to accommodate the 255 / 285 sizes on my 981 Cayman with no issues. -2.7F -2.2R, front toe out 1mm, rear toe in 2mm
12-02-2019, 10:33 PM
#9
My car as it stands now has:
Current Stock:
- 235/35 R20 ET57 8x20
- 265/35 R20 ET45 10x20
Considering OZ Ultraleggera's wheels 19
- 245/35/R19 ET54 = 0.3 inch further out, 3.2% inc in width, -2.6% circum
- 275/35/R19 ET40 = 0.4 inch farther out, 3.8% inc in width, -2.6% circum
TireRack recommends on the same OZ Ultralegerars's
- 235/40 R19 ET54 8.5x19 = 0.12 inch further out, n/c width, circ -0.4% (free rake?)
- 265/40 R19 ET40 10x19 = 0.2 inch further out, n/c width, circ n/c
Rubbing with any of the above set-ups?
The above would be on a 718 with stock regular (non-fancy) suspension that is used for a few DE's a year. No intention of modifying suspension. Will try to max front camber and match rear to front with zero toe in front and maybe ~.10 degree toe-in rear (unsure on the rear toe as of yet)
Current Stock:
- 235/35 R20 ET57 8x20
- 265/35 R20 ET45 10x20
Considering OZ Ultraleggera's wheels 19
- 245/35/R19 ET54 = 0.3 inch further out, 3.2% inc in width, -2.6% circum
- 275/35/R19 ET40 = 0.4 inch farther out, 3.8% inc in width, -2.6% circum
TireRack recommends on the same OZ Ultralegerars's
- 235/40 R19 ET54 8.5x19 = 0.12 inch further out, n/c width, circ -0.4% (free rake?)
- 265/40 R19 ET40 10x19 = 0.2 inch further out, n/c width, circ n/c
Rubbing with any of the above set-ups?
The above would be on a 718 with stock regular (non-fancy) suspension that is used for a few DE's a year. No intention of modifying suspension. Will try to max front camber and match rear to front with zero toe in front and maybe ~.10 degree toe-in rear (unsure on the rear toe as of yet)