12-1/2"x2-1/4" SOLID (Flat-Free) Urethane Scooter & Power Chair Inner Tube Insert Shoprider HD (888WHD) The upgrade CDI advances ignition

The upgrade CDI advances ignition timing and removes the factory rev-limiter

The assembly includes a copious 'kart-style seat

If you have a Hiboy® S2 Pro electric scooter

Invacare: 8881181863

These can quickly be identified by their rims with four mounting holes

12-1/2"x2-1/4" SOLID (Flat-Free) Urethane Scooter & Power Chair Inner Tube Insert Shoprider HD (888WHD) The upgrade CDI advances ignitionNever have a flat tire again! This solid urethane 12 1 2" x 2 1 4" scooter & power chair tire insert can be used to replace the inner tube for most 12 1 2" x 2 1 4" pneumatic (air filled) tires. Please note that this insert will require some effort to install. We highly recommend you purchase two or three tire levers to aid in the installation of this tire insert.