This standard inner tube is designed for 21" tires with widths ranging from 2.50 to 3.00 and features a TR4 valve type. Constructed from airtight butyl rubber, the tube offers excellent flexibility to conform to the shape of the tire and rim. It includes an overlap splice placed opposite the valve stem to improve tube balance and durability. The valve stem features a bright zinc-plated (BZP) metal finish for corrosion resistance. Features Suitable for 21" x 2.50/2.75/3.00 tire sizes Airtight butyl rubber construction Highly flexible material conforms to tire and rim contours Overlap splice for added strength Splice positioned opposite valve for improved balance TR4 valve stem with BZP metal finish Specifications Size: 21" x 2.50/2.75/3.00 Valve Type: TR4 Material: Butyl rubber Finish: BZP (Bright Zinc Plated) metal valve stem
![FIR Tube Inner 4 300 [260x85]](https://cdn.shopify.com/s/files/1/0795/6096/6426/files/stock63949_1_68691990-a850-4852-91b2-d3753fdd5ce6.jpg?v=1758673293&width=480)
