They have crushed walnut shells embedded in the rubber compound for extra grip and I'm very pleased with them.
BMW road force balanced them and they were perfect... my savings were about $750 after getting them to do the balancing.
I bought [Toyo Observe GSi5](http://www.toyotires.ca/tire/pattern/observe-gsi5) for my car, I've no problems with them after three winters, driven country roads without slippage either.
I wanted a cool looking and well working tire. Read several reviews and decided to go a mid-way in price/performance depending on weather conditions in Latvia in summer, so today I got a new set of Toyo Proxes T1R for the summer season
I have about 10K on my '13 TTS. Just changed over to my snows and the original Toyos still look near brand new. Front and back looked about the same in wear.
Everyone stretched Toyo T1Rs because they best UHP but also very stretchable so best of both world what with being dope stance PLUS late night touge runs will win every time.
Mine are at ~28 to 30psi on 205/40/16 Toyo Proxes4 16x9 RH wheels
Tires - I almost forgot! The Toyo tires were fine. Like any street tire, they got a bit greasy near the end of a 20 minute track session. Otherwise, no issues.
My "Q" rated Toyo snows get extremely greasy as soon as the temperature gets to fifty or higher. I love them in temps below freezing, and on icy roads, but they're a little dangerous on warm days.
t1-r's suck.
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