Weighing in at 6.5 kg, the waterproof Rubbee is powered by a 14.4-volt 280-Wh battery pack and it can be attached to a seatpost via a quick release lever. The Rubbee's roller, made from a "special polyurethane compound mix", rests on top of the rear tire. The material ensures good grip between the tire and the roller and there won't be too much of wear as well. The roller will always be in contact with the tire (rubbing all the time, so Rubbee) due to a shock absorber-like arm. According to its creators, in 'motor only' mode (without you pedaling) Rubbee will deliver a top speed of 25 km/h – or about 15mph. Rubbee also gives 800 watts of peak power and has a range of 25 km on average. When totally depleted, the battery pack can be juiced up fully in two hours.

The Rubbee is a kickstarter project which has raised over £26,000 of a goal of £63,000, with 24 days to go.