* Abus Granit X-Plus 540 U-Lock: This U-lock is made of hardened steel and has a 13mm shackle. It's also rated as Sold Secure Gold, which is the highest security rating available.
* OnGuard Pitbull DT U-Lock: This U-lock is made of hardened steel and has a 16mm shackle. It's also very affordable, making it a great option for budget-minded riders.
* Hiplok D1000 Chain Lock: This chain lock is made of hardened steel and has a 10mm chain. It's also very flexible, making it easy to wrap around your scooter's frame.
* Kryptonite Evolution Series 4 Chain Lock: This chain lock is made of hardened steel and has a 12mm chain. It's also very sturdy, making it difficult for thieves to cut through.