badabing

I have a '15 981 GTS that came with the 20" IXRT Sport Techno wheels. They are 20x8.5 ET57 Front and 20X10.0 ET51 Rear. I am looking for another set of wheels to mount winter tires. Someone is selling a set of 20's off a 991. They are 20X8.5 ET51 Front and 20X11.0 ET51 rear.

Can these be made to work? If so, how?

Thanks

andy7777

Fronts are going to poke out some, but 6mm is probably OK. You can probably use the rears with a 10-15mm spacer, but I think it would look a little wide. I had 11 inch wheels on the back of my 981 Cayman GTS with a 10mm spacer and it was OK but in the end I didn't like it.

Personally I'd go with an OEM fit for the 981 and not try to adapt the 991 wheels.

olegd

If you are planning to actually drive in any snow/slush, you want less rim and more rubber. I think 18 inch is ideal and at most 235/265 wide front/rear with good quality winter tires.

85Gold

badabing

I don't actually plan to drive in snow. I was going to mount all seasons so I can drive on dry winter days where the temp is under 40 F

(Current oem tires are summer only)

badabing

Would

(2) Front - 8.5 x 20 ET51
(2) Rear - 11 x 20 ET70

Be a better or worse fit ?

Zach L

That's 911 fitment. The most obvious indication is the higher rear offset. Rear offset should be closer to 40-50 for Cayman/Boxster, and typically with a 9.5-10.5" width.

A higher offset means the wheel with 'tuck' more aka the opposite effect of spacers, all else being the same.