Gt4 wheels on standard 981 cayman

[ELong]

Hi, I was wondering if 981 GT4 alloys would fit on a standard 981 cayman. Looking at forums its 50/50. I have an opportunity to buy some but don’t want to risk it. I plan on buying the x73 pack so will these wheels rub?

 

[Motorhead]

Hi,

According to this post, it seems that the 20” 718 GT4 wheels can be fitted on a 718 GTS, so extrapolating backwards I would imagine that you’ll be okay to do the same with your 981 … although there could be slight differences in offsets between the two series?

GT4 versus GTS wheel size and ETs... - Rennlist - Porsche Discussion Forums

Wheel and Tire Forum - GT4 versus GTS wheel size and ETs... - I figure someone here can answer these questions for me. Trying to find out if the new GT4s wheel/tire combo fits on a GTS. Just got a GTS and its standard wheels are: FRONT: 8 x 20 ET57 with 235/35/20 tires. REAR: 10 x 20 ET45 with...

rennlist.com

Jeff

 

[ianthow]

Based on the 718 sizes in the Rennlist link, the fronts have a deeper offset (61mm v 57mm). This will take the inside edge of the wheel 4mm closer to the strut but I am sure that will be OK. The deeper offset on the GT4 is probably to ensure that the outer edge of the wider tyre does not foul the wheel-arch when turning and/or to keep the pivot point of the wider tyre in the optimum position. The rears should be OK too, the increased offset will keep the 30mm wider tyres inside the body and the centre of the contact patch in the optimum position for grip and handling. Although the deeper offset will bring the inside of the wheel rim and tyre some 9mm closer to the strut, this should not be an issue. A trial fit will verify that you have clearance. If tight, consider a narrow spacer to set the wheel out a little.

FYI, check www.willtheyfit.com to compare wheel and tyre size changes.

 

[Mcmikey62]

Clearly different car with a 718 GTS but I got Mak Monaco 11x20 rear and 8.5x20 front from eBay and am running them as trackday wheels. They have 295 30 20 cup2 on the rear and 245 35 20 front. There is no issue with clearance. Not sure what the offset is as they have gone off sale but they were listed as GT4 wheels and the description said would fit my 718GTS so considered it like for like. Take as what you will and not saying will work for a 981. I’ll look at the wheels tomorrow and come back if they have the offsets somewhere.

 

[ELong]

Thanks for your help. I am not sure how different the 718 is to the 981 so not sure the same concept would apply. From my research looks like the biggest problem is rubbing against the suspension and if you put a spacer on then they poke out. It would be interesting to know if anyone has actually done it

 

[Mcmikey62]

There is a control arm on the rear of the suspension that worried me, the standard wheels looked very close to it but when I put the new wheels on clearance seemed to stay the same. They are close to the wheel arch but a GT4 doesn’t have a different wing so must take them.