In general, they do what they are supposed to.The gears are helpful.However, on mine, the hinge that suppose to fold the bike in two, is STUCK. I specifically limited my search to folding tricycles and thus it was a major disappointment.All the accessories (chain cover, wheel fenders, basket), weigh a 'ton', so I did not bother to assemble.Took me 10 hours to assemble!!!! But I guess it "takes what it takes". I have no data to compare the assembly procedure/instruction with similar products.