dangle wrote:
Rappstar wrote:
Just wait... I've got an extremely in-depth review of 1X friction profiles coming. I'd bet that - at least on the road side - I've got more time on 1X than any other pro athlete. There's just a lot that you learn by running it - and nothing else. I don't think it's that manufacturers are bad about this stuff. I think it's just that they often don't think about it outside of MTB or CX (for right now), just because road 1X is still quite new.I'm looking forward to it. I'm betting there's no way the newer 'clutched' options aren't adding measurable friction to the drivetrain. You can 'feel' it by hand in the workstand and it's not like you can 'feel' the difference between jockey wheels or chains. I'll probably have several questions once that feature hits. After playing around with SRAM (not extensively), Shimano, and adapters to run Shimano mt with road levers, I gotta say the Ultegra with the spring in the alternate position has really been my preference for everything 1x on cross and road. I never did get my hands on Force 1 RD to try before selling a previous SRAM shifting bike though. I'm such a fan of how SRAM stuff just works, has great compatibility and the RD's play nicer with big cassettes. If the spring/cage tension isn't as high (overkill on the road) as the 10 speed mt bike stuff I could see that being great.
It's not that simple. The stiffer spring - I measured it about 4.5lbs vs 3.2lbs in a "typical" position (remember, spring tension varies based on deflection of the spring based on spring constant k) for a Shimano rear derailleur.
(EDITED -->) This should add about 1w of frictional losses. BUT the derailleur uses 12T pulleys instead of 11T pulley, EACH OF WHICH gains BACK some of those losses - though not the same total amount - making it less than 1w. But that doesn't consider the whole picture of chainring and cassette, which presents both opportunities for gain and losses.
So, as I discuss, yes, the clutch ADDS friction, but there are numerous other ways in which CERTAIN 1X configurations actually reduce losses.
I do the in-depth analysis, but at the end of the day, from a purely frictional standpoint, 1X can be both (very slightly) worse and (very slightly) better than 2x. But that doesn't get into the aero discussion...
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