Anyone in Australia do not buy a Kalkhoff bike, you will be sadly disappointed. These bikes for one are designed for European market not Australia which enforces a bike limiter to max of 25kmh. This is very slow for a bike! Most importantly and this comes from experience and has been the case by many other unfortunate buyers of Kalkhoff bikes the engines develop a duck noise making it very embarrassing to ride and start to lose power - see other posts about this http://www.pedelecs.co.uk/forum/threads/clacking-noise-kalkhoff-impulse-2-motor.22024/page-23
Buyer be ware! Don't waste your money like I did.