An ultralight TPU tube built for BMX racing and small-wheel performance bikes. Made in Germany with a patented all-aluminum valve and a patented end-to-end welding process.
Why it works
43–48 g, depending on size. A fraction of the weight of a butyl BMX tube. Because the saving is rotational, the effect on acceleration out of the gate, on jumps, and on spin-up between berms is disproportionately large.
Built for the impacts BMX hands out. TPU's high elongation absorbs landings and curb hits in a way butyl can't. Less prone to pinch flats, more confidence on hard transitions.
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. Smaller than a butyl spare. Fits in a hip pack or backpack pocket without rearranging anything.
100% recyclable. When it finally wears out, it doesn't go to landfill.
Specs
|
|
| Size (ETRTO) |
406 × 40–65 mm (20"), 451 × 40–65 mm (OS20"), or 507 × 40–65 mm (24") |
| 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) |
43 g |
| OS20" (451 mm) |
45 g |
| 24" (507 mm) |
48 g |
Which size fits my bike?
20" (ETRTO 406) — standard BMX race and freestyle wheels, plus most kids' 20" bikes.
OS20" (ETRTO 451) — Cruiser-class BMX race wheels and 20" road/triathlon bikes.
24" (ETRTO 507) — BMX cruiser, junior race, and trial bikes.
Best for
- BMX racers and freestyle riders who want faster spin-up and lighter rotational mass
- Cruiser-class racers running OS20" wheels
- Junior and dirt-jump riders on 24" rigs
- Anyone carrying a spare who'd rather it didn't take up half their bag
Installing a TPU tube — the short version
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.
What makes Eclipse different
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.
