12-Inch Bicycle Inner Tubes 1.75–2.125 – Straight Valve, Pack of 2
Pack of two replacement rubber inner tubes for compatible 12-inch bicycle tyres marked from 12 × 1.75 to 12 × 2.125. Supplied with straight valves, as specified for this product.
Key Features
- Quantity: 2 inner tubes
- Nominal wheel size: 12 inch
- Tyre width range: 1.75–2.125 inches
- Valve orientation: straight
- Application: suitable tube-type bicycle tyres with matching size and valve requirements
Size & Compatibility Guide
| Tyre sidewall marking | Size check | Important note |
|---|---|---|
| 12 × 1.75 | Within stated tube width range | Common ETRTO equivalent: 47-203; check the actual tyre sidewall |
| 12 × 1.90 / 1.95 / 2.00 | Within stated tube width range | Check that the tyre uses the same 203 mm rim diameter and the straight valve fits your rim |
| 12 × 2.125 | Within stated tube width range | Verify the ETRTO code on the tyre, rim size and valve before purchase |
Suitable for children's bicycles and other bicycles, including small-wheeled e-bikes, only where the fitted tyres and valve requirements match. Vehicle type or nominal wheel diameter alone does not prove compatibility.
Reference Sizing
Common 12-inch bicycle tyre markings include 47-203, 50-203, 54-203 and 57-203. The last three digits identify the tyre's bead-seat diameter in millimetres. These are size-identification examples, not a guarantee that every tyre with one of these markings uses this exact tube or valve.
What's Included
- 2 × 12-inch replacement inner tubes with straight valves
Important Fitment Information
Before ordering, compare the full size printed on your tyre sidewall (preferably its ETRTO code), the valve type and its length with your existing tube and rim opening. This listing specifies a straight valve, but does not identify the valve as Schrader, Presta or Dunlop and does not specify its length.
Not suitable for tubeless-only setups or a different rim diameter. Do not assume that every product sold as a “12-inch tyre” uses a 203 mm rim.
Condition
Brand new, unbranded replacement inner tubes.
Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned in its original condition