Onza SA2 MTB Tube - 27.5x1.90-2.40 Inches

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Onza SA2 MTB 27.5x1.90-2.40" Tube, 0.6mm thickness and Presta-Valve.

Inner tubes are part of the rotating mass, and therefore they should be as lightweight as possible. But they also have to be plenty tough as a flat easily eliminates any gain in time.

Presta valves are lightweight and can handle high pressures.
Valve type: Presta-Valve