12-1/2x2-1/4 Inner Tube with 90 Degree Bent Valve Stem Tube is marked 12½ x 2¼ x 2.50/2.75 so it is compatible with 12-1/2x2-1/4, 12-1/2x2.50, and 12-1/2x2.75 tires.
TUB-125BV, 12-1/2x2-1/4 Inner Tube With Bent Valve Stem
TUB-125, 12-1/2x2-1/4 Inner Tube With Straight Valve Stem
12-1/2x2-1/4 Knobby Tread Electric Scooter and Bike Tire
TIR-12250AT, 12-1/2x2.5 Heavy-Duty All-Terrain Tread Scooter Tire
12-1/2x2.5 Inner Tube With Straight Valve Stem Works with 12-1/2x2.5 (12.5x2.5) and 12-1/2x2.75 (12.5x2.75) tires.
12-1/2x2.75 Knobby Tread Tire for Razor MX350 and MX400, Plus other Makes and Models
12-1/2x3.0 Inner Tube With Bent Valve Stem (TUB-12.5X3.0)
12-1/2x3.0 Inner Tube with Straight Valve Stem This tube is sometimes marked 12.5x2.5/3.0 or 12.5x3.0.
12-1/2x3.0 Knobby Tread Electric Scooter Tire
12-1/2x3.0 V-Style Street Tread Scooter Tire (TIR-1253)
12-60 Volt DC Waterproof Blue LED Digital Voltmeter with Battery Level Indicator Panel mount design. Panel cutout size 46mm wide x 17mm high. Overall Dimensions Including Bezel: 57mm wide x 33mm high x 27mm deep. No mounting hardware required. Has built-in plastic mounting tabs that work with panels up to 1/8" thick.