I'm travelling to Frankfurt, Germany in the next month and I'll be staying there for three months, because my trip is related to work, I'm trying to know how to get a bike that I can use to commute, (My daily commute is to get to Bad Homburg) taking into account that my german knowledge is almost none (even thought I'm learning by myself right now), and I don't know how english (spanish or french) comunication is in the aforementioned city. I'd like to know what are the best known places in or near Frankfurt to get a second hand bike. It doesn't have to be a pro one, nothing fancy, I just want something useful at a reasonable price.
I actually grew up near Bad Homburg, and have bought a used bike there. (You do realize that depending on where in Frankfurt you want to go, the way there from Bad Homburg can be quite far?) The two biggest bike shops there are Fahrrad Denfeld and Fahrrad Diehl. At least some years ago, both of these shops sold used bikes as well, and for reasonable prices. I think I bought one from Fahrrad Diehl for 150€ that I used during my 5 years of studying
Communicating in English should not be a problem in either Bad Homburg or Frankfurt, especially with people from "younger" generations / who are < 50 years old
A few German expressions that might help you in your search:
Bicycle in general: Fahrrad
Road bike with drop bars: Rennrad
Folding bike: Faltrad, Klapprad
Cruiser bikes: Hollandrad
Cyclocross bike: Crossrad, Querfeldeinrad (almost obsolete), Querrad, Radcross-Rad
Hybrid bike: this gets difficult, as it might sometimes called Hybrid,m Crossbike, ATB (for all terrain bike) or some improvised name or description.
Singlespeed and Fixie became fashionable in Germany as well; typically the English terms are used as well.
Note that the compound words may also be hyphenated: eg Crossrad is the same as Cross-Rad, and even Cross Rad (which is incorrect but not infrequent).
Regional or Colloquial Terms for Fahrrad are Velo (Switzerland), Radl (Bavaria and Austria), Rad (otherwise). The somewhat out fashioned colloquial expressions Drahtesel and Stahlross might still be used, typically for sturdy old bikes.
Names of Components and Features
Gears, speeds: Schaltung, Gangschaltung, Gänge
Disc brake: Scheibenbremse
Drop bars: Rennlenker
Wheel set: Laufradsatz LRS