Fit the grand prix supersonic coupled with a race28 supersonic tube and youve got the lightest and fastest tyre combination on the market at just 200g the grand prix supersonic offers exceptionally low rolling resistance that rivals that of our renowned tubulars the tyre is now even faster thanks to the new black chili compound which utilises nano particles of carbon to create a molecular structure of the rubber comound which is stronger faster amd grippier than previous compounds our su