Security chain with Integrated lock is made up to 140cm by Abus,
[J&B imports for US shops]

I recently purchased an Abus Link lock , it folds fits in a pouch,
I fit to the frame, via water bottle bosses.

Abus also makes Ring locks , those would lock around your rear wheel ,
so wont be taken by rolling off. they attach to the frame, so always there..

Armored Cable locks ar a good thing too, loop one of those over my Handlebars.