Why? What is better?
In theory a cable system needs occassional tuning so if you aren't good at adjusting derailleurs electronic has the benefit of set and forget. However, since break in my 9000 bike hasn't needed a single adjustment.
The only significant benefit I see to electronic is if you want hydro brakes. The hydro/di2 levers are much slimmer and lighter than the hydro/mech levers.
My sole annoyance with shimano is a rear deraliuer cable that's prone to failure every 2,000 + miles, but I"m also a believer in stick with the devil you know, versus the one you don't. And changing the cable every few months is not too different than recharging in terms of attention.
"Sometimes you don't need a plan. You just need big balls." Tom Boonen
(shimano: 5800,6800,9000,r8000,r9100, sram: red22,rival22,force22 campy: record11, chorus11, super record11, athena11, potenza11)... I think I've owned all those in the past 3 years some multiple times haha and di2 craps on them all. If you want to build a cheap bike or doing a true weight weenie build with some red go for it otherwise jump to electronic and don't look back.
Think about mechanical, you shift one way it's your lever force vs chain's resistance+ derailleur spring which is fine you can force the shift as hard as you can.
you shift another way (think of going to smaller cog in the rear) it's then only derailleur's spring vs chain's resistance.
the derailleur spring vs chain's resistance struggle is the most noticeable when you did not let go of the pedaling force (either uphill, on trainer or just racing, whatever situation) when shifting thus chain tension is high and derailleur spring have hard time or just can't make it to shift where electronic shifting's motor still can force the shift to happen precisely.
Sram mechanical make derailleur's spring hard so you need more lever force to shift up. Shimano make derailleur's spring soft so it's soft lever touch but it struggle more on down shift when chain tension is high. With the way conventional mechanical derailleur work there is no win here. Let see if Rotor Uno hydraulic groupset will be any difference (the index is at the RD, not at the shifter for Rotor groupset!)
Not that we should shift without soft pedal though, it's just useful for racers/sprinters who don't really care of how long chain/sprocket will last.
For Campy I think many will prefer the elect. as the tuning of the mech. seems to be not that easy.
For Shimano, I aways read that the Dura Ace mech. is excellent so that the difference is not that big.
I am currently riding SRAM Force (for the weight saving and price). I don't race and I am paying for it so I am sticking whatever keep me riding.
Also, if the mech group's not working, I can probably fix it DIY. If an electric group breaks, I won't know how to debug it.
And I drive manual transmission for my car, maybe that's what I prefer mech group for now.
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