50/34 vs 52/36 for climbing

Discuss light weight issues concerning road bikes & parts.
TobinHatesYou
Posts: 4190
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

StevenH72 wrote:
Tue Sep 03, 2019 1:17 pm
Crumbs, if 4W/KG over 200km is average I'm a long way off.... (mentally ramps up training plan)

I've an FTP of ~3.3W/KG (260W @ 77-78kg) and currentl use a 50/34 - 11/30 set-up.

4.5w/kg FT and I run the same gearing. I have not spun out on a competitive descent for more than a couple of seconds getting to speed. Not being afraid to supertuck helps. I have considered moving to 52/36 though...maybe if I actually start being competitive in the hilly races...aka gain a .2-.3 w/kg.

cjm
Posts: 12
Joined: Mon Jan 14, 2019 12:56 pm

by cjm

What sort of weight differance is there between running ultegra or dura-ace, 50/34, 11/28, and 52/36, 11/32?

by Weenie


alcatraz
Posts: 2212
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

I estimate ~200gr less for duraace. Most of the weight saving is in the crank, shifters and cassette. The rest is negligible.

Duraace has no 32t cassettes. The highest is 30t for 9100 series and 28t for 9000 series. The 9000 series derailleur can support a 9100 series 30t cassette no problem.

The difference between chainring sizes is negligible.

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