I'm looking for advice on where I can mount a ulock or if a chain lock can be wrapped around the frame while riding? Problem is, I have a 15" men's hardrock that has a slanted top tube and I'm not willing to give up my water bottle. Any advice on size of ulock (or chain) and where I can attatch it to the bike for transport? My tires are 2 1/4" thick too. Thanks!!!!