(03-24-2013, 10:33 PM)mateff Wrote: I guess that I will need all of that, but the question is which one, the 68/107 or the 68/127.5....
Which wheel I will need if I have a 15 speed system, a single one or a three like the one I have....
Thanks for you answer I think is help me understand a little more about this, thanks a lot.....
The M131 is about the least expensive crankset available. It is rugged and will last a very long time. More expensive ones are lighter, but not more rugged.
You can install a single chainring crankset if you want, they are more expensive than the M131, and that will result in you having a 5 speed bike instead of a 15 speed.
Shimano recommends 122.5mm axle BB for the M131. I have than combination, and will be changing to a 113mm axle BB soon.
Different cranksets have different recommended BB axle lengths.
At the same time that you replace the cranks, you should also replace the chain
http://www.amazon.com/KMC-Chain-Speed-Nickel-Plated/dp/B000AYFRUE/ and freewheel
http://www.amazon.com/Sunrace-Freewheel-14-28T-5-Speed-Black/dp/B000AYB57S/ .
See
http://techdocs.shimano.com/techdocs/index.jsp for more information on Shimano component installation.
Wheel: do you mean something like this:
http://www.amazon.com/Avenir-Nutted-Cruiser-Freewheel-1-75-Inch/dp/B003RLL5VM/
even though it says 7 speed, a 5 speed or 6 speed freewheel will fit fine.
A couple of decades ago, people used to refer to bikes as 10 or 15 speeds, signifying 5 gears in back and 2 or 3 in front. Now with the proliferation of high count cogs on cassettes, some refer to an old 10 or 15 speed as a 5 speed with double or triple chainrings. For example our T50 currently has a 7 speed cassette with triple chainrings, and will be getting a 9 speed cassette (new rear wheel, rear derailleur and shifter) in the next couple of weeks.