I got my wife a Trek 8.5 DS 2 summers ago, and put a BionX 350 rear hub motor on it and she loves it... She had a bike for around 4 years before that, and she put about 350KM on it over the 4 years she had it... Last year she put over 1,000Km on it and the year before she put 1,200Km on it... You don't really need a new bike to go E-Assist, you just need the right bike with the right setup...