Ducati Dealer
GTL
Posts: 496
Join Date: May 2005
Location: Petersfield - Hants
Mood: Just fallen in love with road riding again!
520 would be fine, less drag / weight etc. etc. as long as you use a good quality race chain, DID is my choice.
525 would last longer though but if its just for track days and you're not doing race starts you'll be fine with 520.