Sidecar / pillion adaptable for standard push bike I'm looking for an add-on sidecar / pillion to add on to an existing bike. This is so that I can transport someone around who doesn't want to walk too far as well as helping me keep fit. **Reseach** * < * I've already looked at complete solutions but they seem very expensive at over 1000 pounds: Rickshaws, motorised bikes, etc. Also add-on seats on the back which I think may be risky with regard stability. * < * < What I need is a sidecar for an adult, that will attach securely and safely to the side like a pillion / side car. Thank you.

AFAIK sidecars for bicycles do not exist, pretty much because there needs to be space for the crank, pedal and riders lower leg and foot to revolve in. A sidecar would get in the way. Additionally the center of mass would be shifted to one side, and that will cause a huge problem when braking - the sidecar wheel would have to have a brake linked to the bicycle brakes.

There are bicycle passenger trailers and you may be able to find one that is rated for an adult.

Bear in mind that towing the weight of adult in a trailer will require lower gearing than normally fitted to regular bicycles, and possibly more powerful brakes. Look at cargo bikes intended to carry two children or >100kg or cargo for what I mean.