the shop i got my trek from has ordered me a new set of wheels but they havent come in yet and i cant wait any longer to go riding.the mavic wheels im looking at are from performance. there are 3 of there stores in my area and they have the 517's in stock and they have to order the 618's.the mustangs are also a build set from another shop near me......they are all around 200 dollars give or take and its just a matter of which ones to get.i was reading the reveiws at mtb reveiw on the 517 some good some bad.