Kryptionite evolution mini questions.
 

This lock looks to be pretty small, can i fit it around my MTB frame and lock it without problems? I will have another cable lock [12mm] will this be enough for school, and going into a cafe downtown?

My bikes are: K2 attack

Old road bike that looks cheap but has dura ace brakes.

Probably enough to lock the top tube to a rack, but not enough to lock the rear wheel to the frame + rack.

For school, no. Cafe if you're inside for 10-15 mins and can see your bike yes. The krypto evo is good if you can lock your wheel (s) as well as your frame, but that cable is worse than useless unless you're just using it to lock your seat/accessories up.

I use my cable now for school on a $700 bike. People lock up with tiny chains here, so when I get the evolution, it will be the best locked bike there.

LoL>

I'd consider getting some type of locking wheel skewers that replace the quick releases on the wheels and seatpost binder bolt. Preferably, ones that also replace the bolt in the fork as well. A good brand is Pitlocks, which are sold from urbanbiketech.com or Peter White Cycles. With these, you can use the Evolution lock around the frame (or the rear wheel as per Sheldon Brown's method), and do away with the cable lock altogether.

The correct method for using the Evo Mini is to put it around your rear wheel, just behind the seat tube. NEVER put a u-lock around any part of the frame, as dumb crooks will use the bike as a lever to break the lock, but damage the frame while doing so.

A Evo-Mini will be a snug fit around the typical rear wheel of a MTB and a thinner than average locking post. You need a cable lock, or longer u-lock to secure the front wheel to the frame.

The Evo Mini is a coffee shop lock...when the bike will not be out of your sight or your reach for more than four or five minutes. And, even at a coffee shop, it is more suitable for a $200 bike than for a $800 bike.