You can’t say a lot about a bike shops. I only mention this one for a couple of reasons. The ubiquitous folding bike seems to be everywhere these days and for the discerning Barcelonese commuter there are none better than the Brompton,  and these guys are Brompton specialists. The next reason is that in my all dealings they’ve displayed admirable honesty, appear to be very knowledgeable and pretty cheap to boot. Finally, for the princely sum of 20 cents, they provide use of an automatic pump that is available to all at the front of the shop. With many buildings not having elevators and Barcelona being such a great city for cycling, Bike Tech is a good destination to get yourself some portable wheels.