35 grams. That's what a standard butyl BMX tube weighs in grams after you subtract the 65 g you saved switching to this. For a racing class where a gate reaction of 0.1 seconds separates the podium from the pack, rotational weight at the wheel is one of the few legal gains left on the table. Why it works 35 g. The entire tube. A typical butyl equivalent in this size runs 100 g or more. That's 65 g of rotational mass removed from each wheel — acceleration you feel from the gate and through every corner. 30–47 mm width range — built for race profiles. Covers slick racing tyres and treaded race rubber in the standard UCI BMX racing format (20" × 1.35–1.75"). Not designed for wider dirt jump or street tyres — see the BMX TPU tube if that's your setup. TPU grips pressure under load. In sprints, jumps, and hard landings, the tube holds its shape without the pressure creep you get from butyl under repeated impact. Consistent pressure means consistent handling — lap after lap. Patented all-aluminum Presta valve with removable core. 40 mm length fits standard BMX race rims. Core is field-replaceable if it ever needs attention. Patented end-to-end welding. The seam junction is where other TPU tubes fail under impact. Eclipse's process removes it. 100% recyclable. Specs Size (ETRTO) 406 × 30–47 mm Wheel size 20" × 1.35–1.75" Weight 35 g Valve Presta, 40 mm, all-aluminum, removable core Material TPU Made in Germany Recyclable 100% Race setup note Check your tyre width before ordering. This tube is optimised for 30–47 mm (1.35–1.75") race profiles. If you run wider dirt or street tyres (1.75"+ and above), the BMX TPU tube (406 × 40–65 mm) is the correct fit. Best for UCI BMX racing and sanctioned competition on standard 20" race wheels Pump track riding where low rotating mass improves carry speed through transitions Riders who've squeezed everything else out of their setup and want the tube to match Installation — four things that matter with TPU Zero air on entry. Insert the valve completely flat — no exceptions. No tire levers on the second bead. A 20" tyre bead is short; mount by hand. Soft-inflate to 0.3 bar (5 psi) first, confirm the tube is seated without folds. Inflate in 1 bar (14 psi) steps to race pressure. Squeeze the sidewalls all the way round before full inflation. What makes Eclipse different Eclipse pioneered TPU inner tubes in 2011. The patented all-aluminum valve and patented end-to-end welding were designed to solve the failure modes that show up under competitive loads — not just reduce weight on a scale. Every tube is QC-checked before it ships.
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