Eclipse GT Gravel tube - 622 x 30/45mm

A gravel tube built for long days on rough roads — with a thicker TPU wall than the Performance line for extra puncture protection where it matters most. Made in Germany with a patented all-aluminum valve and a patented end-to-end welding process.

Why it works

Thicker wall for rough-surface confidence. The GT uses a heavier-gauge TPU than the Performance gravel tube. Sharper stones, broken tarmac, and unpredictable terrain — the GT is built for the kind of surfaces where you don't get to choose your line.

65–69 g, depending on valve length. That's still around 60% lighter than a standard butyl gravel tube — a significant saving you'll feel in acceleration and when carrying a spare in your frame bag or jersey pocket.

Stable at pressure. TPU holds air more consistently than butyl. Less frequent top-ups, and a ride feel that doesn't degrade over a long day in the saddle.

Patented all-aluminum valve with removable core. If the valve core ever works loose or leaks — it takes 60 seconds and a valve tool to fix. 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 before anything ships.

Packs small. Fits a jersey pocket, frame bag, or saddle roll. An important detail when you're hours from the nearest bike shop and need to carry your own insurance.

100% recyclable. When it finally wears out, it doesn't go to landfill.

Specs

Weight by valve length:

Threaded valve + nut options available in 50 mm and 70 mm.

Which valve length do I need?

40 mm — standard gravel rims and most alloy wheels.

50 mm — mid-depth carbon gravel rims, typically 25–35 mm deep.

70 mm — deeper carbon rims, 35 mm and above. If your rim depth is close to a boundary, go longer — you can always use less, you can't add what isn't there.

Best for

• Long-distance gravel rides, bikepacking, and multi-day events
• Riders who want tubeless-level weight savings without the sealant maintenance
• Mixed-surface riding where road quality is unpredictable
• Anyone who's had a flat 50 km from civilisation and doesn't want to repeat the experience

GT vs Performance — which one?

The Performance gravel tube (51–53 g) is optimised for minimum weight — ideal for racing and fast mixed-surface riding. The GT (65–69 g) uses a thicker TPU wall for better puncture and cut resistance. Choose GT when the route is long, remote, or runs through terrain where a flat would cost you more than a few minutes. Both share the same patented valve and welding technology.

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.