Suggestions for Brompton for 3F walkup?
My wife and I have two standard 2006 M3Ls. Not used much recently but we keep them in good shape. We're planning to move them to a third floor walkup apartment in El Born, Barcelona. BCN is relatively bike friendly. It has some upslopes - not too bad but my wife can get tired. I would like to spiffy them up, add an ebike wheel and battery pack (3kg) and get lighter components to compensate for the additional weight. We'd mostly use them to extend our range going around the city. The bike shares are useful but there are restrictions on time and sometimes there's no bike or no parking. We're in our mid50s relatively healthy.
Would like to request for best suggestions to cut weight or improve the bikes. I'm willing to spend $500 per bike (plus 700 for the ebike kit). I can spend a bit more if it makes sense. I would have loved to do a full ultralight set up like Raxel's. But business is bad so this is not the time. Anyway would appreciate comments and suggestions. TIA!