Quick Summary
The Continental R28 Training Presta Inner Tube is a black inner tube for 700C wheels with a stated tyre fit of 25-32C. It uses a Presta valve and the valve length is 42 mm.
This tube is identified with model number 181921 and a stated weight of 139 grams. If you are choosing between options, the key checks are wheel size, tyre width and valve length.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | Continental. Useful for matching the tube with the product range you want. |
| Model | R28 Training. Helps confirm the exact version. |
| Product type | Inner tube. Choose this when you need a replacement tube rather than a tyre. |
| Wheel size | 700C. Check this against your wheel size before buying. |
| Tyre fit | 25-32C tyres. The tube is intended for this stated width range. |
| Valve | Presta valve. |
| Valve length | 42 mm. Compare this with your rim depth and valve access needs. |
| Weight | 139 grams. A useful check when comparing similar tubes. |
| Colour | Black. |
| Model number | 181921. |
What to Compare Before Buying
- Wheel size: This tube is for 700C wheels, so match that size to your bike.
- Tyre width: The stated fit is 25-32C, so compare it with the tyre size you use.
- Valve type: It has a Presta valve, so confirm your rim and pump setup suit that valve.
- Valve length: The 42 mm valve matters if your rim depth affects valve access.
Before You Decide
Check the 700C wheel size, the 25-32C tyre range and the Presta 42 mm valve before choosing an offer. The model number is 181921, so it is worth matching that reference if you want this exact tube.
