Concept Bikes & Bike Innovation - for better or worse

Exactly, my sister done that already with an old folding shopper and a d-lock, a very long d-lock to be precise.

Yeah, but itd be great if the lock was either integrated into the bike frame or if a small padlock could fit through a loop in the frame locking both ends together.

Using a D-lock defeats the purpose.

The purpose being to:

A: Remove the need to carry a very heavy large lock.

B: Design a integrated locking system, which basically means the bike has to be severly damaged to get it free.

I know that those Puma/Saab bikes had a cable which was both a locking device and a structural part of the frame (like a holeshot) but the cable was not at all sufficient for security and the bikes are rideable without the cable fitted. (all be it very flexy & fragile) So thieves would still be tempted to cut the lock (very easy) and take the mostly intact bike which is still worth lots of money.