What Size Inner Tube Do I Need for a 26 Inch Mountain Bike?
What Size Inner Tube Do I Need for a 26 Inch Mountain Bike?
If your mountain bike has 26 inch wheels, you need a 26 inch inner tube — but the exact size depends on the width of your tyre, not just the wheel diameter. Getting the wrong width means a tube that either won't fit or won't stay properly inflated.
Here's everything you need to know to get the right tube first time.
Step 1 — Read the numbers on your tyre sidewall
Look at the side of your tyre. You'll see numbers printed on it, such as:
- 26 × 1.95
- 26 × 2.10
- 26 × 2.125
- 26 × 1.75
The first number (26) is the wheel diameter. The second number is the tyre width in inches. This is the number you need to match when buying an inner tube.
You may also see an ETRTO code alongside, such as 50-559 or 54-559. The 559 confirms a standard 26 inch MTB wheel. The first number (50, 54 etc.) is the tyre width in millimetres.
Which inner tube width do I need?
Inner tubes are designed to fit a range of tyre widths, not just one exact size. A tube labelled 26 × 1.75–2.125 will fit any tyre in that width range.
| Tyre marking | Compatible tube size |
|---|---|
| 26 × 1.75 | 26 × 1.75–2.125 |
| 26 × 1.95 | 26 × 1.75–2.125 |
| 26 × 2.10 | 26 × 1.75–2.125 |
| 26 × 2.125 | 26 × 1.75–2.125 |
| 26 × 1.50 | 26 × 1.25–1.75 |
Rule of thumb: if your tyre width falls within the range printed on the tube, it will fit.
Step 2 — Check your valve type
As well as the tube size, you need the correct valve type for your wheel rim.
Schrader valve — wider, looks like a car tyre valve. Standard on most mountain bikes and hybrid bikes. The rim hole is wider.
Presta valve — narrower, with a small threaded locknut at the top. More common on road bikes. The rim hole is narrower.
Do I need a Schrader or Presta valve for a 26 inch mountain bike? Most 26 inch mountain bikes use a Schrader valve. Check the hole in your wheel rim — if it's wide enough to fit a pen, it's Schrader. If it's narrow, it's Presta.
Can I use a Presta tube in a Schrader rim? No — the rim hole is too wide and the tube won't seal properly. Always match the valve type to your rim.
Step 3 — Check valve length
Standard valve lengths (32–40mm) work for most mountain bike rims. If you have deep-section rims, you may need a longer valve (48mm+). For most 26 inch MTB wheels, standard length is fine.
Where to buy 26 inch inner tubes in the UK
We stock the full range of Impac 26 inch inner tubes at Peak Bike Station, including:
- 26 × 1.75–2.125 Schrader valve — the most common size for 26 inch mountain bikes
- 26 × 1.75–2.125 Presta valve — for bikes with narrow rim holes
- Less common widths available — contact us if you need a specific size
Free UK delivery on orders over £18, or collect same day from our shop at 18 Maguire Avenue, Hadfield, Glossop SK13 1DE — a short walk from Hadfield train station on the Glossop line from Manchester Piccadilly.
Can't find your size at a big chain bike shop?
Large cycling chains stock the most common sizes but frequently run out of specific widths or valve types. If you've tried your local high street and drawn a blank, we stock the full Impac range and can dispatch next working day across the UK.
This is particularly useful if you're cycling in the Peak District, High Peak, or North West and need a replacement tube quickly — order online before 2pm for next working day delivery, or collect from Hadfield if you're local.
Frequently asked questions
What size inner tube do I need for a 26 inch mountain bike? Check the tyre sidewall for the width — most 26 inch MTB tyres are between 1.75 and 2.125 inches wide. A tube labelled 26 × 1.75–2.125 will fit the majority of 26 inch mountain bikes.
Do I need a Schrader or Presta valve for a 26 inch mountain bike? Most 26 inch mountain bikes use a Schrader valve. Check the hole in your wheel rim — Schrader holes are wider (like a car tyre valve).
Can I use a 26 × 2.10 tube in a 26 × 1.95 tyre? Yes — as long as both sizes fall within the tube's stated range (e.g. 26 × 1.75–2.125), the tube will fit both tyre widths.
What does 559 mean on an inner tube? 559 is the ETRTO bead seat diameter for a standard 26 inch MTB wheel. If your tyre or tube shows 559, it's the correct diameter for a 26 inch mountain bike.
What happens if I fit the wrong size inner tube? A tube that's too narrow may not inflate properly or could pinch and puncture. A tube that's too wide will bunch up inside the tyre and is likely to puncture. Always match the tube width range to your tyre width.
Where can I buy 26 inch inner tubes near Glossop or the High Peak? Peak Bike Station in Hadfield, Glossop stocks 26 inch Impac inner tubes in Schrader and Presta valve options. Order online with free UK delivery over £18, or collect same day from Hadfield near the Longdendale Trail.
Where can I buy 26 inch inner tubes near Manchester? Peak Bike Station is accessible from Manchester Piccadilly via the Glossop line — Hadfield station is approximately 50 minutes by train. We also offer free UK delivery on orders over £18.
What if the big chain shops don't have my inner tube size? We stock the full Impac 26 inch range including less common widths. If you can't find your size on the high street, order online from Peak Bike Station for next working day UK delivery.
Who does free postage on 26 inch inner tubes in the UK? Peak Bike Station offers free UK delivery on orders over £18, including 26 inch mountain bike inner tubes.
Peak Bike Station — Independent bike shop, Hadfield, Glossop. Stocking inner tubes, chain lube, brake pads and accessories for cyclists across the High Peak, Peak District, Greater Manchester and the North West.