Originally Posted by
deCycles
Hi Guys,
I am going to purchase a SRAM Force Groupset to replace my out of date Shimano Tiagra Groupset that came with my '09 Cannondale CAAD 9/6. I need some help on the sizing. I know cranksets come in like 170mm or 175mm sizing and say like 39/53 GXP and such. What is all that? Braze-on or Clamp-on Front Derailleur? Teeth in cassette? I am at a total loss on what to buy. The frame is 58cm. I am about 6'1" 165lbs. I have no clue if you need other sizing information about my personal self. Just looking for some information on what is right for my bike. Remember, SRAM Force Groupset!
Just look at your current parts and see what you have.. Some are set (like if you have a braze-on FD) but the rest are personal choice. Frankly if you have to ask these questions you probably should not be piecing a group out for yourself.
Crank length, compact vs. standard, and cassette choice are things no one can answer for you, but we could give some more useful advice if you tell us what your current parts are and how they're working for you. For example, do you want lower gears or tighter spacing between gears?
50/34 = compact crank. The number of teeth on the chainrings. 53/39 is a typical "standard" crank.