i am thinking of upgrading my citizen tokyo with a 7 speed and triple crankset (maybe a disc brake will come in too) so i will have a 21 speed Citizen Tokyo. the people at citizen told me it might be doable but they haven't heard, nor done nor seen anyone did this. hey, i figured out since i spent less money on this one, why not do something fun. i like tinkering things. at first i was thinking on getting a sturmey archer since it's a drop in replacement but had a change of mind and i just want to do it one at a time. currently i have placed an order for a Selle XO seat and a 7 speed shifter/brake combination. the 7 speed cassette and rear and front derailleurs is forth coming. also i will change the crankset into a triple shimano cranksets. some might say why not just get a downtube, dahon, tikit or birdy. but it's the fun factor of working on something you think will not work and when it does work you had the feeling of satisfaction. crazy, ha.....anyone had experience with the upgrade ? i would really appreciate any input...