Maxxis Tube 3.50/4.00-18 TR4 (XCS) (P)

Maxxis Tube 3.50/4.00-18 TR4 (XCS) (P) is a purpose-built inner tube designed for 18-inch motorcycle tires. Sized to fit 3.50/4.00-18 applications and featuring a TR4 valve stem, this tube delivers reliable inflation, consistent seating, and enduring performance for riders who demand confidence on every ride.

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  Precise compatibility — fits 3.50/4.00-18 tires and uses a TR4 valve stem for easy inflation with standard pumps and gauges.
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  Durable construction — natural rubber with a uniform wall thickness provides reliable air retention and resistance to pinch flats during mounting and on bumpy roads.
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  XCS design — Maxxis’ XCS construction signals a premium build focused on durability and dependable performance under a range of temperatures and riding conditions.
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  Front or rear versatility — suitable for both wheel positions on many bikes that run 18-inch rims, giving you flexible replacement options.
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  Easy installation — designed for straightforward mounting and removal, helping you get back on the road quickly after a tube change.
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  Practical riding benefits — steadier air pressure, smoother ride quality, and fewer re-inflation checks on longer trips or daily commuting.

This Maxxis inner tube is ideal for riders of classic and modern bikes alike who rely on 18-inch wheels. It’s particularly well-suited for cafe racers, scramblers, lightweight dual-sport machines, and street-oriented builds that use 3.50/4.00-18 tires. When you want a dependable tube that supports consistent performance and easy maintenance, the Maxxis 3.50/4.00-18 TR4 (XCS) (P) stands out as a thoughtful, purpose-driven choice.

Care and use tips: inspect rims for sharp edges before installation, ensure the bead seats evenly, inflate gradually to your typical riding pressure, and check for any pinpoint leaks after installation. Regular maintenance helps maximize tube life and road-ready reliability.