Graham Silverstone RS GMT
Graham sponsor the Swiss Gurnigel Bergrennen hill race. It took place on 9-10 September 2017, with 200 cars and 50 motorbikes that drive up a 3.7 km course uphill, from the Bernese village of Dürrbach up to Gurnigelbad, a vertical distance of 314 metres at an average gradients of 8.4%, with maximum slope of 12.6%.…