"But if you stop pedalling, the bike will stop as well."
Mr Teasdale delivers mail in Victoria and Glenholme, and estimated he covered around 25-45km a day and up to 200km a week, depending on mail volumes.
Since the amount of mail had dropped from around 2000 items to 700-800 items a week, the delivery rounds had got bigger to compensate, he said.
New Zealand Post spokesman Richard Trow said the bikes had been given to city centres where the terrain was suitable to ride.
Rotorua was one of the first places to get the bikes, he said.
The new bikes were suitable for delivering an increasing number of parcels as the letter delivery business continued to decline, he said.
Around a billion mail items a year were delivered to letterboxes five years ago.
That was now down to 640 million per year and falling, he said.
"There's obviously a limit to the load posties can carry, so the e-bikes are one option NZ Post is adopting.
"Other vehicle types are also being trialled, the rollout of which will depend on things such as local terrain, postie round size and mix of items."
The bikes have a top speed of 25km/h and 10km/h on footpaths. The battery lasts between 30km and 35km.
