The perfect fit for your 27.5 inch wheels. The Bair Bikes 27.5 Inch CST Inner Tube is a premium quality replacement tube designed for mountain bikes, hybrid bikes, and compatible electric bikes running 27.5 inch wheels — delivering reliable, long-lasting performance every ride.

The 27.5 inch wheel size — also known as 650b — is one of the most popular sizes found on modern mountain bikes, trail bikes, and a growing range of electric bikes. Having a quality spare tube on hand means a mid-ride puncture is nothing more than a minor inconvenience rather than a ride-ending disaster. The CST brand is trusted by riders worldwide for consistent quality and reliable puncture resistance — making this an ideal spare for any 27.5 inch rider's kit.

Whether you're hitting local trails around Torquay, commuting on a hybrid e-bike, or exploring the Surf Coast hinterland on a mountain bike, this tube has you covered.

Key Features:

• 27.5 inch / 650b size — fits mountain bikes, trail bikes, hybrid bikes, and compatible e-bike models
• CST brand — trusted globally for consistent quality and reliable performance
• Wide tyre width compatibility to suit a range of 27.5 inch tyre profiles
• Schrader valve for easy inflation with a standard pump
• Quality butyl rubber construction for dependable puncture resistance
• Lightweight and compact — easy to carry as a spare in your e-bike bag or backpack
• Quick and easy to install — minimal tools required

Not Sure Which Tube You Need? Check the sidewall of your current tyre — the size is printed clearly (e.g. 27.5 x 2.10 or 650b x 2.25). If your tyre is in the 27.5 inch / 650b range, this is your tube. For fat tyre e-bikes check out our 20 x 4 or 26 x 4 inner tubes, and for road and commuter bikes see our 700c tube.

Best Used With: Pair with the Bair Bikes Portable Bike Pump and Strong Tube Repair Kit for a complete puncture-ready setup — at home and on the trail.

Who It's For: Mountain bikers, trail riders, hybrid cyclists, and e-bike riders running 27.5 inch wheels who want a reliable, correctly sized spare tube ready to go — so a puncture never cuts a great ride short.

Quality construction, perfect fit — the spare tube every 27.5 inch rider needs.