TUBE INNER 8 x 2.50/2.75 12-1/2, 8" rim size with a 12 1/2" OD, Note this is not 12" rim size

Inner Tube 8" RIM SIZE, OD 12-1/2" x 2.50/2.75 Straight Valve Stem

Fitting. Scooter Inner Tube. typically used on Chinese electric scooters and dirt bikes.

This tube is compatible with the Razor MX350 and Razor MX400 dirt rocket. This tire is also used on the rear tire for the X-Treme X-560.
May also be compatible with other models of scooters and dirt bikes.
Note. This tube is more like 8" rim size with a 12 1/2" OD.

Mini Moto Dirtbike Inner Tube 12.5 x 2.5 / 2.75 Straight Valve
This size inner tube is only used with the 8 inch rim mini moto dirt bike models or mini pocket dirt bikes It comes with a standard straight Schrader valve. If your tyre says 12.5 x 2.50 or 12.5 x 2.25 or 12.5 x 2.75 this

Part No. 68-040.EA (oro2u.com)