Something that goes through the spokes, on on or both wheels, is a good idea to prevent someone from simply rolling the scooter away after popping the steering lock. I use a good bicycle u-lock, or a super heavy bicycle chain, through the wheels. I make sure that anything I use is kinda visible, as a deterrent. A cover can also act as a deterrent as well.

u-lock (anything similar that fits: https://www.amazon.com/gp/product/B0081UDF58/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1

short chain: https://www.amazon.com/gp/product/B006QN0MIU/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1

chain2 (long, for fence posts, used with u-lock) https://www.amazon.com/gp/product/B000W0RQY6/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1