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I am also trying to figure out spacing to use 987.1 wheels and snow tires on my 2012 987.2 Cayman. The issue is clearance for the brake discs which I think is only an issue in the front.

Specs:
987.1 wheels-snow tires 987.2(2012 stock wheels/summer tires)
Front 6.5J x17 ET55-205/55 17 7Jx17 ET55 - 205/55 ZR17
Rear 8J x 17 ET40 - 235/50 17 8.5J x17 ET40 - 235/50 17
front Backspacing 5.92 in 6.17 in => difference is 0.25 in or 6.35mm
rear backspacing 6.07 in 6.35 in => difference is 0.25 in or 6.35 mm
I measure about 6mm of clearance from the stock 2012/987.2 wheels to the brake caliper. The 987.1 front wheels with snow tires just hit the brake caliper.

I believe adding a 7mm spacer to the front and rear wheels. will compensate for the difference in backspacing and give clearance for the brake calipers in front. Inputs/thoughts welcome.

A quick search located this spacer but I am looking for other sources for spacers.

Thanks in advance for constructive inputs.
 

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Apologies my chart of wheel/tire size in the original post didn't format well. It was actually legible in the original view on my computer.

The issue I have with clearance is from the inside face of the front wheel to the caliper outside face.
The picture shows the clearance with the stock 7J x 17 wheels that came on the 2012 Cayman.

I misunderstood the backspacing dimension. A smaller backspacing number means more clearance from the inside of the wheel to the suspension components.

Link to a backspacing calculator.

I believe I can use the 987.1 narrower wheels on the 2012 987.2 with the addition of a 5mm or 7mm spacer for the front wheels only.
 

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