Hi I've tested this tyres for 2 weeks. The tyres are fine. You ned more ear in the rear tyre than in the T66X i use 36psi. Inn the front tyres 30psi. I use 130/90 rear. Have not tested inn havy rain. OK down to 0 deg. Have only tested the Michelin T66(X), and the Sirac is mutch bether. Stig Solstad Norway