18 x 1.75-2.125 Bicycle Inner Tube – Schrader / AV Straight Valve
Replacement inner tube for 18-inch bicycle tyres in the 1.75 to 2.125 inch width range. Designed for rims that use a standard Schrader (AV / car-type) valve and suitable for front or rear wheel use when the tyre and rim specification match.
Key Specification
- Nominal tube size: 18 x 1.75-2.125
- ETRTO / ISO family: approximately 47/57-355
- Valve: straight Schrader / AV / car-type
- Wheel bead-seat diameter: 355 mm
- Colour: black
- Position: front or rear
- Condition: new aftermarket replacement
- SKU: 02041-WHL
Compatible Tyre Sizes
This tube is intended for 18-inch tyres within the stated width range, including common markings such as 18 x 1.75, 18 x 1.90, 18 x 1.95, 18 x 2.00, 18 x 2.10 and 18 x 2.125, provided the tyre uses the 355 mm bead-seat diameter and the rim accepts a Schrader valve.
Suitable Applications
- 18-inch children's bicycles
- 18-inch BMX / freestyle bicycles
- Compact or folding bicycles using 355 mm rims
- Compatible e-bikes using the same 18-inch tyre size and Schrader valve
Important 18-Inch Size Warning
18-inch bicycle sizes are not all interchangeable. Check the tyre sidewall before ordering. This listing is for the 355 mm ETRTO family. It is not intended for the different 18 x 1 3/8 / ISO 400 mm wheel family.
Fitment Checks Before Ordering
- Confirm the tyre sidewall shows an 18-inch size between 1.75 and 2.125 inches wide.
- Where an ETRTO number is shown, confirm the diameter ends in -355.
- Confirm the rim is drilled for a Schrader / AV valve rather than Presta.
- For unusually deep rims, compare the required valve length with the product photos before fitting.
Installation Notes
Inspect the tyre and rim tape for sharp objects before installation. Add a small amount of air to give the tube shape, fit it without twisting or pinching, then seat the tyre evenly before inflating to the pressure printed on the tyre sidewall.
Material note: equivalent tubes in this size are normally manufactured from butyl rubber. Exact compound and valve length can vary between aftermarket production batches.