These are VERY tight to put on the first time! You have to make sure the bead isn't set when putting the second side on, if the wire is down in the inner rim you'll be fine. I pinched/levered my bead enough that it damaged the rubber on the bead, and allowed the tire to pull free of the wire bead while riding so it blew through the sidewall after the first ride (while having post-ride beer in the pkg lot...BOOM!) My fault, but be careful you don't damage the bead on the tire or you could have the same problem as me/others! Gave it 3 stars since i haven't had a chance to ride them fully yet...just putting the warning out there. Don't seem to be overly heavy either as others mentioned, not like a DH anyway.