Compact vs. Triple

[SadieKate]

I believe the largest 10 spd cassette made by Shimano is 27. SRAM makes a 28. Campy makes a 29. If you can swap out hub parts to make your hubs, Campy-compatible you can use a Campy cassette with a Jtek Shiftmate. You will need to be sure your rear dérailleur is long enough.

To go larger than this, you must use 9 spd mountain cassettes from SRAM or Shimano.

[Triskeliongirl]

Indeed I am running a 9spd setup, ultegra short reach brifters, custom 50/34 crank set (for my LLD), and an XT rear derailleur and 11/34 casette (and ultegra brakes and durace chain).

I noticed terry is specing Isis sport with an IRD 10 spd 11/34 in back paired with a shimano deore LG SGS, so it seems like 10 speed is possible: http://www.terrybicycles.com/cycling...isissport.html

I also contemplated putting an 11/32 on with my ultegra triple long cage rear derailleur. I ran the numbers by on sheldon's site, and it looked like it would just work (although barely, and only with the long cage triple not double rear der). But, I decided to switch out the rear derailleur to get the 34 since I had already bought the mountain derailleur and 11/34 cassette.

In my case another reason to go with a double stemmed from my need for a custom crank set to deal with my LLD, and the fellow making it really pushed me to go with the compact double. But I am very happy with it.

[PscyclePath]

Depends on how your motor's running, and how you're riding... I have three road bikes, one with a triple (53/42/30 by 12-25 9-speed cogset) which is my main touring all-round riding bike; one with a 53/39 12-25 9-speed cassette, which is sort of a spare, but is fast as all get-out) and a new one, with a 50/34 10-speed compact double. Took a little getting used to in not having the 42 ring and using the granny gear only on the real bad hills, but I like the compact every bit as much as I do my old triple-ringed Trek. New bike has been getting the miles lately in an effeort to get used to it, and it's destined to be my racer/fast bike.

Best advice is to try one, and see how it suits your riding style.