WITH JUST under 20,000 miles on its odometer, our long-term Mazdaspeed3 had accelerated, braked, and torque-steered its way through the original-equipment Dunlop SP Sport 2050 tires. For replacement, we opted for a set of Toyo’s Proxes T1R, also a Y-rated (186 mph) summer tire. Cost for the set, including mounting and balancing, came to $980.
Wearing its brand-new, sticky shoes, the Speed3 paid a visit to the track, where it laid down slightly inferior numbers compared with when it had the O.E. Dunlops: Lateral acceleration dropped from 0.90 g to 0.87, 60-to-0 braking increased from 106 feet to 112, and the figure eight slowed from 26.0 seconds at 0.70 g to 26.7 at 0.66. In the real world, though, those Toyos seem to deliver comparable handling and, even better, less…