T here are a few retrofit smart lock solutions available these days, and Nuki is arguably the best of the lot. I just got started with the smart lock, and it does everything I need in a retrofit ...

Grasp Lock on Kickstarter is the first biometric update of the traditional bike U-lock. It doesn’t have a key mechanism, and it goes on and off with a snap.

The smart U-lock comes in two sizes; one with a short beam and it has a dimension of 224.8x130x32.2mm. There is also another model with a longer beam and it has a dimension of 300x130x32.2mm.