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HELP - Ultegra 6800 11-Speed Groupset Config

7K views 13 replies 10 participants last post by  jeremy_s 
#1 ·
Hi,
I am asking for some help with choosing the correct 6800 groupset as I am not sure which Chainring Set (53-39, 50-34, 52-36, 46-36), Crank Arm Length (165, 170, 172.5, 175) and Rear Derailleur (Short Cage, Medium Cage) to choose.

I am going to put this on a 51cm Cervelo s5 and would like simple guidance on what to select.


Thanks in advance.
 
#3 ·
Hi cantride55,
Thanks for your help.

I was riding a standard 105 groupset and don't remember the config of it. My height is about 5'5"/165cm and I primarily road ride on flat to small incline/decline terrain for fast-paced leisure and possibly to compete.
 
#6 ·
There must be a lot of cyclists with weak legs. What else explains all the compact cranks with 28 or 32 cogs. If you are in good shape 53-39 and 12-25 works great, even with steep climbs. Plus standard gearing keeps one honest and avoids false senses of accomplishment. i ride 53-39 was talked into an 11-28 recently, and very much thinking of switching to 12-25. i tend not to use either the 11 or the 28 cog.
 
#9 ·
I got fitted last summer and was recommended to switch to a 170 from a 172.5 (I'm 5'8"/32" inseam). I was in the process of switching to 50/34 anyway (from 53/39)---can't really tell a difference with the new 170. So unless you're more than a serious rec rider, you probably won't notice either. I went with 50/34 to maintain better cadence on our many 6-8% inclines and that has definately made a difference. On a steep downhill you'll spin out faster with a 50/34 but I ride for the uphills---that's where the fitness gain is. We have several 12% plus grades so I added a 12-28 cassette. It's much easier now to maintain 80-85 rpm on a 30 mile ride and knees feel much better. Hope this helps and post what you go with.
 
#14 ·
Everyone states you'll spin out easier, not the case. A compact crankset with 11-28 cassette is moving more mph at 100 rpms in 50/11 that a 53/39 with a 12/28 cassette in 53/12


There is no "false sense of accomplishment". It's technology plain and simple.
 
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