Join Date: Jul 2009
Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC
Mentioned: 6 Post(s)
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Quoted: 41 Post(s)
What brand model crank are you trying to put on the bike. We assume that you will aslo be re-using the original bottom bracket (crankset spindle/axle). So you cannot just go buy a new crank out there and expect it to work as you will most likely need a tapered squre holed crankset, similar to the original that came with the bike and not the newer crank mount designs that have come up since your bike was made (I suspect your Puch is from the 80's from the number of speed it has).
Please post good clear pictures of you bike's present drivetrain and we can the suggest to you what to buy and install on your bike.
As for using the existing chain and other parts of the drivetrain, as long as the waer on the is not too bad, they will work, but the ideal always i to match a new crank with a new chain, becuase a worn, stretched out chain will accelerate the wear on you new crank's chainring and maybe affect the front derailleur shifting performance on you bike. The same goes for the rear cogs and derailleur if you are changing them out to new too.