I just came from the first ride on the Abec 11 97 mm 75 A Flywheels and I can honestly say this is the best upgrade any Bamboo could get , I literally went through all broken sidewalks and cracks , really bad roads like I was on good pavement . It ' s not as good as pneumatic tires but enought to notice a big difference between the Evolves 83 mm , on the Evolves I felt like the tracks could be teared appart from the deck . The speed has increased as well , on the Evolve wheels you feet need to be very stable otherwise the board will do strange things , I used to keep it under 30 kmhr , but with these you feel you go much slower but in fact you are cruising much faster , there are no strange movements at all and I can even go higher , you feel confident you have total control on the board . Noise wise these are very quiet , extremely quiet I ' d say , I just hear a subtle sound of the motor but somehow it got quiter as well , maybe it ' s just my idea . The acceleration has been reduced , but I only felt it between 0 and 15 kmhr after that it starts to speedup almost the same as before , the maximun torque curve has moved from a lower speed to a higher .