Sigismond - have you researched the Acros system? Genuinely?
And before we begin, let's think about context here:
You are on WEIGHT WEENIES. You are on a forum where people think of iLinks, Powercordz and the lot as "standard" practice items. Guess what? That's not the majority of any market. It's so ridiculously niche it's not even funny. So let's think about everyone else - because guess what, that's what any realistic company would do. What would a normal rider want? Lighter group compared to their standard group.... and guess what, a hydraulic drivetrain will be lighter compared to a normal drivetrain, even with your calculations. But, let's go over them....
Yes, it can be thin plastic tubing but it has to be rather strong tubing that will not deform under pressure. The cylinders can be light CNC'd alu, sure, but that's a whole lot more extra alu than is in a mechanical lever and derailleur. Don't forget that you have to add in the weight of the mineral oil in the housing as well as the piston. I know it's not super heavy, but it adds up.
Mineral oil adding up to significance? You're kidding, right? The mineral oil in a full system is still lighter than the weight of steel cables. The tubes are lighter than the common housing. That's two areas of being lighter.
You're also forgetting that with hydraulic there are less moving parts. Take a look at the ACROS derailleurs sometime. Notice that there's only one spring in the rear derailleur (a normal derailleur has two) ? Notice that the front derailleur doesn't have a spring either? Less parts, less things to fail.
Hydraulic derailleurs have the potential to shave a few grams over traditional housing and cable, but I'd be incredibly surprised if a full hydraulic derailleur system is lighter than the same gruppo with mechanical derailleurs/Powercordz inside iLinks.
Context and reality, as described above. Try to think outside of your niche sometime, yeah?
And again, don't forget the hassle of setting up hydraulics, which might be even more headache-inducing on derailleurs. Plus the maintenance of bleeding the system once a year, replacing the seals every 2-3, etc. Traditional cable have stretch, but once they're bedded in, you're good for years of maintenance-free riding.
Hassle? You've never set one up then? It's really easy. Heck, you can do it at home in a few minutes... There's YOUTUBE videos on how easy it is.
Also: paradox much? Cable stretch and maintenance free in the same sentence? On metal cables? Do you not ride your bike?
And you can't puncture a cable in a fall like you can with hydro tubes.
I have yet to hear of anyone puncturing a hydraulic line, ever, even in the nastiest of trail conditions. Even if that did happen (again, show me a case) your derailleurs won't have the springs that would force the chain in a direction. There is only one spring to tension the chain, that's it. So if you do puncture, just set your derailleur manually and you can still make it home without being forced into a gearing that won't work for your terrain. A little bit of a hassle to change gears that way, but *f##k* me I don't see that as a possibility with an electronic failure or a mechanical-cable failure.
Out of curiosity, how much lighter do you think a full hydro system would be over hydro brakes+mech shifters? And I mean Sram vs Sram, not Sram vs flimsy boutique derailleurs.
Wait... you're saying the Acros derailleurs are flimsy?
Do a bit of research on them.
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