My holroyd, changed a lot, gearing was a bit stiff so i got a 16 tooth super pro crank. its short in length and im quite tall so i got the biggest stem i could find surprisingly better. Only changed the wheels cos im stupid and like spending money, profile hub etc. p.s the grips are pretty cool, or were until i wore them down due to excessive use. down sides: the crank arms run really close to the magura, keep getting my trainer caught in between, peddles are dangourous shredded up the back of my legs. cheers