Only a perfectly tuned scooter can shows its true grit on the street. Poor setup can lead to up to a 30% loss at the rear wheel. So hundreds of pounds are spent on high-end tuning parts and often only mild power reaches the rear wheel. The fine art of tuning a scooter is not just in the use of high quality parts, but in getting these parts to work together well. 1 set of 8 rollers 25x16mm, 15g.