Twin Power Heavy Duty Motorcycle Tube 3.25/3.50-19 Tr13 Straight Rubber Valve Stem. TWIN POWER. $20.95. (No reviews yet Valve Type: Schrader (Car Type)/ Inner Tube Size: 3., 25 - 19/ Valve Angle Type: Straight/ Wheel Rim Size: 19 Inch/ Material: Butyl Rubber PLEASE NOTE: This innertube fits a number of different size tyres. Comes complete with Schrader straight valve and cap (car type) Motorcycle Inner Tube Sizes SET OF TWO: Motorcycle Tire Inner Tube 90/90-19 | 100/90-19 | 3.25/3.50-19 - TR4 Straight Valve Stem 3.25-19 Inner Tube Straight Valve Comes complete with Schrader straight valve and cap (car type); This size inner tube will fit the following tyre sizes: 2.75-19, 3.00-19, 3.25-19, 3.50-19, 4.00... Not all of the sizes this innertube fits will be printed on the innertube itself, as the space is limited. 19'' heavy duty Inner Tube suitable for Motorcycles Motorcycle 19 inch Inner Tubes If the size you purchased is not written on the innertube or is written differently don't be alarmed, it will fit your tyre if your size is listed within the range of fitment sizes on the product listing.