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A lightweight TPU off-road tube for junior MTB and youth bikes in 20" and 24". Made in Germany with a patented all-aluminum valve and a patented end-to-end welding process.
32–38 g. A fraction of the weight of a butyl junior MTB tube. Because young riders feel rotational weight even more than adults — they have less torque to push it — the upgrade is felt on every climb, every gate, and every spin-up.
Real puncture resistance. TPU's high elongation handles roots, rocks, and curb hits better than butyl. Fewer rides cut short, fewer roadside repairs.
Patented all-aluminum valve with removable core. If the core ever works loose, swap it in 60 seconds with a valve tool. No new tube needed.
End-to-end welded, not spliced. Eclipse's patented welding process eliminates the seam junction — historically the most common failure point in TPU tubes. Backed by tight in-house QC.
Packs to nothing. Easy to slip a spare into a hip pack or backpack so the kid can keep riding when something goes sideways.
100% recyclable. When it finally wears out, it doesn't go to landfill — a good thing to teach early.
| Size (ETRTO) | 406 × 40–65 mm (20" × 1.5–2.6") or 507 × 40–65 mm (24" × 1.5–2.6") |
| Valve | 40 mm Presta, all-aluminum, removable core |
| Material | TPU (thermoplastic polyurethane) |
| Made in | Germany |
| Recyclable | 100% |
Weight by wheel size:
| Valve | Weight |
|---|---|
| 20" (406 mm) | 32 g |
| 24" (507 mm) | 38 g |
20" (ETRTO 406) — most 20" junior MTB and kids' off-road bikes.
24" (ETRTO 507) — junior MTB, youth dirt-jump, and progression-level kids' bikes.
TPU installs differently from butyl. Four things matter:
Start with zero air. Insert the valve completely flat — no pre-inflation. This is the single most common installation mistake.
No tire levers on the second bead. Mount by hand. Levers pinch TPU in a way they don't pinch butyl.
Soft-inflate to 0.3 bar (5 psi) first. Before closing the second bead fully, give it a small amount of air to seat the tube without folds or twists.
Inflate in steps. Go up in 1 bar (14 psi) increments, not all at once. Before you hit full pressure, squeeze the sidewalls around the whole wheel to check the tube isn't peeking out anywhere.
That's it. Once it's seated, it behaves like any other tube.
Eclipse pioneered TPU inner tubes in 2011 — before the category existed commercially. The patented all-aluminum valve and patented end-to-end welding process aren't marketing language; they're engineering decisions made to solve real failure modes. Every tube is QC-checked before it ships.
Thermoplastic Polyurethane (TPU) is a thermoplastic elastomer that sits between rubber and plastic — combining the elasticity of one with the processability of the other. Commercialised in the 1950s, TPU gained wide adoption in sports equipment over the past 15 years thanks to its elasticity, abrasion resistance, and durability.
TPU is known for its high elasticity, flexibility, durability, and resistance to abrasion, which makes it first choice in multiple sports applications, like bicycle grips and inner tubes. Eclipse TPU material can be stretched by over 400% before failure.
Modern TPU is a highly sustainable material which can be recycled and reused without losing significantly on its material properties, it's therefore poised to lead in future material developments
Thermoplastic Polyurethane (TPU) is a thermoplastic elastomer that sits between rubber and plastic — combining the elasticity of one with the processability of the other. Commercialised in the 1950s, TPU gained wide adoption in sports equipment over the past 15 years thanks to its elasticity, abrasion resistance, and durability.
TPU is known for its high elasticity, flexibility, durability, and resistance to abrasion, which makes it first choice in multiple sports applications, like bicycle grips and inner tubes. Eclipse TPU material can be stretched by over 400% before failure.
Modern TPU is a highly sustainable material which can be recycled and reused without losing significantly on its material properties, it's therefore poised to lead in future material developments