CST Xpedium Ampero Effective puncture protection! In recent years, e-bikes have enjoyed increasing popularity in this country. However, the tyres on these bikes show more wear because they go much faster than conventional bikes. There are even e-bikes that can reach speeds of up to 50 km/h. That is why the Xpedium Ampero has also been tested for speeds up to 50 km/h. If you need a tyre for your e-bike, the Xpedium Ampero is the best choice because it has been specially developed for e-bikes. This tyre is ECE certified and approved for a maximum speed of 50 km/h. - Puncture protection layer (EPS) .