Boost has an alternative: take your existing bike and make it electric. As you can see from the photo above, you're looking at £645 for the whole kit ... rivals here are Swytch and Cytronex.

Swytch makes the Go conversion kit — we rated 4 stars in our Swytch Go review — and a range of different kits for different bikes. You can get an Air mountain bike conversion kit for $499 ...

Skarper’s e-bike conversion kit has been in development ... Skarper is double the weight of the Swytch Bike Air Kit we tested last year, but there are no wires or batteries taking up valuable ...

Is an electric bike something you should have, or not? All the parts of a Swytch kit. From the Swytch assembly ... my friend Russ’s electric minimoto conversion I was given the rare opportunity ...