Hi, My Dad wants to have a go a cycling for fitness, but due to dodgy knees can see himself being in the situation of being out, then having his knee give up on him. I told him about how electric bikes work now, where they give assistance to your pedalling, but this made hime think he would just be further away should his knees give in. What he wants (what he really, really wants) is a bike that has the pedal assist to make it easier for him, but also has a throttle, so he can sit back and be powered back should he have to give the knees a rest? He wont be doing long distances, 5 miles along the towpath is all I can see him doing. Does such a bike or retro fit system exist? I hope so, as I would really love to go for a ride to the pub with the old fella! Thanks for any advice.