Bicycle Tyres & Tubes: Punctures, Pressure, Repairs & Maintenance
OMO BikesShare
A practical guide to bicycle tyres and tubes — from choosing the right tube and maintaining tyre pressure to identifying punctures and avoiding repeated problems.
1. Butyl vs. Moulded Tubes
Moulded tubes are common and cheaper. Their air retention is generally lower, so air may need to be refilled every 4–7 days. Most bicycles priced up to ₹30,000 currently use moulded tubes.
Butyl tubes are less common in bicycles priced up to ₹30,000. They are more expensive and made from better-quality material, with higher air retention. Air generally needs to be refilled every 7–15 days.
2. How to Read Bicycle Tyre Information
Indian bicycle tyres commonly have information printed in four different formats:
1. 54-507 or 40-622 — This is the tyre size according to the ISO/ETRTO system. 54 indicates the approximate tyre width in millimetres, while 507 indicates the rim diameter in millimetres.
2. 24×2.1 or 700x40c — This is the commonly used inch-based tyre size. 24 indicates the approximate wheel size, while 2.1 indicates the approximate tyre width in inches. You may also see sizes such as 26×1.95, 27.5×2.1 or 29×2.2.
3. 30 TPI / 45 TPI / 60 TPI — TPI means Threads Per Inch and describes the number of threads used in the tyre casing. Generally, a higher TPI casing is finer and more flexible, although TPI alone does not determine overall tyre quality.
4. 40–65 PSI / 70–80 PSI — This is the manufacturer's recommended tyre pressure range. The correct pressure should normally be kept within this range, with the ideal pressure depending on factors such as rider weight, tyre size and riding conditions.
| Bicycle / tyre type | Typical width | Broad pressure range |
|---|---|---|
| Road | 25–32 mm | 60–100 PSI |
| Hybrid / City | 32–45 mm | 40–70 PSI |
| Gravel | 38–50 mm | 25–55 PSI |
| MTB / XC | 2.0–2.4" | 15–35 PSI |
| MTB / Trail | 2.3–2.6" | 15–35 PSI |
| Fat bike | 3.8–5.0" | 5–15 PSI |
3. How Often Should You Fill Air?
Bicycle tubes gradually lose air over time, even without a puncture. The frequency depends on the type of tube:
- Moulded tubes: Check and refill air approximately every 4–7 days.
- Butyl tubes: Check and refill air approximately every 7–15 days.
These are general guidelines. If the tyre feels noticeably softer than usual, check the pressure before riding rather than waiting for the next scheduled refill.
4. Why Do Bicycle Punctures Happen & How to Identify Them?
Punctures can happen for several reasons, and the location and pattern of the hole can often help identify the cause.
- Sharp objects: A thorn, glass, nail or wire usually causes a single small hole where the object has penetrated the tyre.
- Pinch flat: Two closely spaced holes, often called a “snake bite”, usually happen when the tube gets squeezed between the tyre and rim, commonly due to low tyre pressure or a hard impact.
- Rim tape/rim problem: A hole or repeated damage on the rim-facing side of the tube can indicate damaged, displaced or inadequate rim tape, or a sharp edge on the rim.
- Tyre damage: A worn, cut or damaged tyre can allow sharp objects to reach the tube more easily and can also cause repeated punctures.
- Valve damage: Leakage or damage around the valve may result from incorrect installation, excessive movement of the tube or a damaged valve.
- Poor installation: A tube can get pinched, twisted or trapped between the tyre and rim during installation, resulting in a puncture soon after fitting.
5. Why Do I Keep Getting Punctures After a Repair?
If you have repaired a puncture but are getting another puncture soon after, the problem may not be the patch itself. A sharp object may still be stuck inside the tyre, the rim tape may be damaged, the tube may have been pinched during installation, or the tyre may be worn or damaged.
Low tyre pressure can also increase the chances of repeated pinch flats. Identifying the location and pattern of the new puncture can help find the actual cause.
6. What Happens When the Tyre Sidewall Is Damaged?
The sidewall provides important structural support to the tyre. Small superficial marks may not be serious, but deep cuts, bulges, exposed threads or visible tube material can indicate structural damage.
A damaged sidewall can eventually cause a sudden failure. If the tyre's structure is compromised, replacement is generally safer than repair.
7. Schrader vs. Presta Valves
Schrader valves are wider and commonly found on MTB, hybrid and everyday bicycles. Presta valves are narrower and commonly used on road and performance bicycles.
The two require different valve openings and, depending on the pump, may need different adapters. Always check the valve type before buying a replacement tube.
8. Tyre & Tube Warranty
Tyres and tubes are generally considered wear-and-tear components and are usually not covered under standard bicycle warranties. At OMO Bikes, we do not provide a warranty on tyres and tubes.
However, our goal is to help our customers have a good ownership experience and keep their overall cost of ownership as low as possible. That is why we try to share as much practical and experience-based information as possible, helping you identify common problems, avoid unnecessary repairs and reduce avoidable costs.