Surface 604 Heavy-Duty Inner Tube 20×4" — 3mm Thickened for Fat E-Bikes
A heavy-duty inner tube for 20×4" fat e-bike tires. The 3mm thickened butyl wall resists pinch flats and punctures far better than a standard tube, which matters on a heavy e-bike that hits curbs and trail edges at… Read more ↓
Arrival dates are estimates and may change due to circumstances beyond our control (customs clearance, shipping delays, supplier timing).
Pre-order option
Paying in full todayPaid in full — reserved
You've paid in full and your unit is reserved — first in line when stock lands. Nothing else owed.
We get it ready
Stock arrives around October 30, 2026. Our Calgary mechanics assemble, torque-check and road-test every bike before it goes out.
Ships the moment it arrives
As soon as stock lands and your bike is dialled in, we ship it to your door — or pick up at our Calgary shop if you're local.
A heavy-duty inner tube for 20×4" fat e-bike tires. The 3mm thickened butyl wall resists pinch flats and punctures far better than a standard tube, which matters on a heavy e-bike that hits curbs and trail edges at…