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Yep, speed sensor is at the transaxle final drive (rear wheels). Even thought 986/987 diameters are within 10% I would not arbitrarily swap tires. As the wheels move further away from a stock setup the ABS will become more sensitive to road sand, painted surfaces, wet gutter crossings etc. Braking zones might get annoying. I'll keep to the stock setup for best results.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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