CST Tube 27.5 x 1.9/2.5 PV 48mm

Name: CST Tube 27.5 x 1.9/2.5 PV 48mm
Brand: CST
SKU: CST-CST-TUBE-27-PV
Price: 6.00 GBP
Availability: InStock

£6.00 GBP

Taxes included. Shipping calculated at checkout.

The CST 27.5 x 1.9-2.5 Schrader Valve Tube is a durable, flexible and great-value replacement inner tube for 27.5 inch mountain bikes, hybrids and recreational bikes, offering reliable puncture repair performance for Brisbane trails, Queensland bikeways and everyday Australian riding.

Key Features

Fits 27.5 inch / 650B tyres from 1.9 inch to 2.5 inch wide
48mm Schrader valve makes inflation simple with common pumps
High butyl concentration improves flexibility and air retention
0.97mm wall thickness adds useful puncture resistance

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SKU: CST-CST-TUBE-27-PV
Barcode: 6976416399455

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Technical Specifications

Product Name: CST Schrader Valve Tube 27.5 x 1.9-2.5 inch 48mm
Brand: CST
SKU: CT271925SV48
Product Type: Bicycle inner tube
Wheel Size: 27.5 inch / 650B
Compatible Tyre Size Range: 27.5 x 1.9 inch to 27.5 x 2.5 inch
Approximate ETRTO Compatibility: Around 47mm to 64mm wide tyres on 584mm bead seat diameter rims
Valve Type: Schrader / AV / Auto valve
Valve Length: 48mm
Tube Material: High butyl rubber
Wall Thickness: 0.97mm
Colour: Black
Recommended Use: MTB, trail riding, hybrid riding, commuting, recreational cycling, fitness riding, e-bike use where compatible and general puncture repair
Best Bike Type: 27.5 inch mountain bikes, hardtails, recreational MTBs, hybrid bikes, compatible commuter bikes and selected 650B e-bikes
Main Upgrade Purpose: Tube replacement, puncture repair, spare tube kit, MTB service, commuter bike service and everyday bike maintenance

Compatibility Notes

Designed for 27.5 inch / 650B wheels only.
Best suited to tyres marked 27.5 x 1.9, 27.5 x 2.0, 27.5 x 2.1, 27.5 x 2.25, 27.5 x 2.35, 27.5 x 2.4 or 27.5 x 2.5.
The rim must be drilled for a Schrader / AV valve.
Not suitable for Presta-only rims unless the rim has been safely adapted.
Always check tyre sidewall size, rim tape condition and valve compatibility before fitting.

High Butyl Rubber Construction

This CST tube uses a high butyl rubber concentration to improve flexibility, durability and air retention. Butyl rubber is the most common material used for dependable bicycle inner tubes because it holds air well and is easy to install during everyday puncture repairs.

0.97mm Wall Thickness

The 0.97mm wall thickness gives this tube a more durable feel than many lightweight tubes, making it a practical option for MTB, hybrid and commuter riding where rough paths, roots, rocks, kerbs and road debris can increase puncture risk.

48mm Schrader Valve

The 48mm Schrader valve is easy to use with many standard floor pumps, hand pumps and service-station air hoses. The extra valve length also helps with pump access on many 27.5 inch MTB and hybrid rims.

27.5 / 650B Wheel Compatibility

The 27.5 inch / 650B format is common across modern mountain bikes, recreational trail bikes, hybrids and some e-bikes. This tube suits a broad 1.9-2.5 inch tyre width range, making it a versatile workshop and home spare.

Everyday Service Reliability

A fresh tube is often the quickest and most cost-effective way to fix a puncture, slow leak or damaged valve. This CST tube is designed as a practical service part for riders who want simple tube-type reliability without the setup requirements of tubeless.

Tube Fitment

Wheel Diameter: 27.5 inch / 650B
Rim Bead Seat Diameter: 584mm
Tyre Width Compatibility: 1.9 inch to 2.5 inch
Valve Type: Schrader / AV
Valve Length: 48mm
Wall Thickness: 0.97mm
Material: High butyl rubber

Fit Checklist Before Purchase

Before ordering, confirm:

Your tyre sidewall says 27.5 inch, 650B or 584.
Your tyre width is between 1.9 and 2.5 inches.
Your rim uses a Schrader / AV valve hole.
Your tyre is not cracked, cut or heavily worn.
Your rim tape is secure and covering all spoke holes.
No glass, wire, thorns or sharp debris remain inside the tyre.
Your pump is compatible with Schrader valves.

Installation Notes

Slightly inflate the tube before fitting so it takes shape.
Check the inside of the tyre for sharp objects before installation.
Fit the tube evenly inside the tyre.
Avoid trapping the tube under the tyre bead.
Inflate gradually and inspect both sides of the tyre bead.
Recheck tyre pressure before riding.
Replace damaged rim tape or worn tyres if punctures keep recurring.

The CST 27.5 x 1.9-2.5 Schrader tube is best suited to riders who need a dependable replacement tube for mountain bikes, hybrids and recreational bikes using common 27.5 inch tyre sizes.

Product Care

Check tyre pressure regularly.
Keep tyres inflated within the range printed on the tyre sidewall.
Inspect tyres for glass, thorns, wire or sharp debris.
Check rim tape if punctures occur on the inside of the tube.
Avoid riding under-inflated, as this can cause pinch flats.
Replace cracked, worn or damaged tyres.
Store spare tubes away from heat, sunlight and sharp tools.
Do not overinflate the tube outside the tyre.
Use care when fitting with tyre levers.
Recheck tyre bead seating before riding.

Warranty Information

Warranty coverage is subject to CST or retailer terms and conditions.
Warranty generally applies to manufacturing defects such as faulty seams or valve defects.
Punctures, pinch flats, incorrect installation, tyre damage, rim tape failure, overinflation, underinflation, heat damage and impact damage are generally not covered.
Tube life depends on tyre condition, rim tape condition, air pressure, rider weight, terrain and installation quality.
Professional installation is recommended if punctures keep returning or if the cause of air loss is unclear.