Toyo R1R real world technical specs!

Toyo R1R real world technical specs!

Once again BrainGT has very nicely done some measurements on the Toyo R1R’s. As he is using the Toyo R1R’s in his STS2 Honda CRX in the SCCA National Tour. Look at all is hard work for everyone advantage:

195/50-15 - minimal tread left = 22.75″ diameter
195/50-15 - almost full tread = 23.0″
205/45-16 - 3/32 tread = 23.0″

String method, and the full tread 195 marks matched up exactly to the marks on the 16″ shaved to 3/32nds.

As for weight of the R1Rs:
195/50-15 minimal tread on 15×7 rpf1 = 25.8 lbs
195/50-15 full tread on 15×7 rpf1 = 29.4 lbs
205/45-16 3/32 tread on 16×7.5 ssr = 29.4 lbs

It was very strange the the full tread 195/50-15 was exactly the same diameter and weight as the 3/32 205/45-16. I checked them multiple times.

Compared to the Bridgestones:
195/50-15 RE-01R almost full tread on 15×6.5 konig helium = 32.4 lbs
205/45-16 RE-01R 2/32nd tread on 16×7.5 = 30.2 lbs

R1R Tread width:
~8″ for 205/45-16 R1R on a 16×7.5″ and ~7 7/8″ for 195/50-15 R1R on a 15×7″ (measurements = +/- 1/16″ depending on how you judge treadwidth, but the relative to the 15″ 16″ is 1/8″ wider. I am measuring with a string, so I don’t think a wider 15″ wheel will make a huge difference)

Courtesy of: BrianGT