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For commuting, this dumb lil u-lock mount is hands-down my favorite accessory I have ever purchased. Just way easier than digging around in a bag every time you stop to lock up.
HOWEVER pretty much all the images you can find will show you the WRONG way to mount it on your frame; the best way is to put it on your seat tube so that the lock's center of mass is as close as possible to the mount's center of mass. Any other way and that mfer will drive you crazy with all the clankin and flappin around. You might think that this setup would rub against your inner thigh while riding, but I have pretty substantial thighs and can assure you that this is not an issue.