Originally Posted by
HillRider
First you probably don't "need" a 12x25 10-speed cassette, it may just be what you have now. You can change your cassette range if you want different gearing and you don't have to use an Ultegra (6600 or 6700) cassette either. 105 or Tiagra 10-speed cassettes will work just as well and cost less. Dura Ace 10-speed cassettes will work well, be a bit lighter and cost WAY more.
Second, are you sure about that 53T, 110 BCD chainring? Ultegra 10-speed FC-6600 and FC-6700 standard cranks used a 130 mm BCD and were geared 53/39. Ultegra compact 10-speed cranks (FC-6750, etc) used a 110 mm BCD but came with 50/34 chainrings. Again, 105 chainrings with the proper BCD and tooth count will work equally well.
hi HR, all,
thanks a lot. took it to my LBC and they gave me the chainring measurements.
some questions please?
1. do i just count the teeth on the chain ring? where do i measure the diameter from? sounds like ultegra 6600/6700 should do it. is there a difference?
2. sounds like ultegra 6600/6700 will work as well for cassette? any differences?
3. 12x25 works for me i think. i never understood these well. i guess the ones in between are equally spaced out? is there a way to thing about alternatives? like i could get a 35x8 or something (?!) and gave an easier uphill gear and a "heavier" downhill gear?
THANKS