I've got one that's elastic and it goes around my seat stay so it's all good From my favourite link: In Manchester, there's so many scallies riding around with no lights or brakes (V-brakes unclipped because the wheel is f**ked) that the police turn a blind eye to most things, I ride my bike without lights and no one cares. But then again it's not very safe, so I use them when I remember. Driving a car you know how invisible cyclists can be.