Crazy, I'm using the OG medium for the the rear wheel/seat tube. Able to get it around all the racks I use and there's little to no wiggle room. Very satisfied.

Thanks for the reply. Have you had any problems opening and closing the lock? Do the keys turn smoothly? The 4 bolt locking mechanism on the Pitbull medium is supposed to be a really nice feature.

I've only had this lock for a couple of weeks at the recommendation of my trusted LBS. Lock is easy and perfect so far. We'll see. Seems like a quality piece.

thanks for letting me know how well the lock works. Hopefully it will serve you well for years to come.

Thanks everyone. I just got the Onguard Standard last week and so far I am happy with it. It unlocks with no problems at all and it is working great. I lubricated the lock as well.