I have 3 bikes with SR EPS.
But the only choice is Dura Ace.
Lighter, better thought out, easier to install, easier to charge (without needing to drill an extra hole in your frame which will be redundant once they realise it is a bad idea!), easier to customise, better availability.
EPS looks nice, and don't get me wrong, it works beautifully. But Dura Ace just has the edge. Although the Clavicula and EEs are nice, the full Dura Ace groupset has reached such a fantastic state of performance and weight that there isn't necessarily a huge advantage to going mix and match any more.
What is comes down to is a personal choice.
tantra wrote:After a couple of rides on rented bikes, I have decided to upgrade to electric. I am currently running D/A 7900 on my Seven bike. I have already replaced the 7900 crankset with a Clavicula. I am running EE brakes, which I also plan to keep. Hence, I will only be replacing the shifters, derailleurs and cassette. I could go either Campy or Shimano at this point without mixing components. I have not seen any direct comparisons between 9070 and EPS. The upgrade prices are similar. I would like to hear informed opinions about which electric system works better and which is lighter. If possible, I will use an internal battery.
I would go with Di2 (which I have) for two main reasons:
1) The Campy design to put the brains of the system in the battery is a bad move. Batteries wear out and I can't help but think that in ~5 years if you need a new battery it will be a burdensome replacement cost on Campy vs Shimano. To their credit, they are getting around to doing a batter that fits in the seatpost, so they have closed that gap. I still don't agree with their engineering decision though.
2) I have a Seven that is drilled for Di2, but yours probably isn't so you will need to run some cabling around the outside. Shimano has a new wireless piece for the RD that eliminates some of the external wiring. This speaks to a better future for fewer external wires on Di2.
I have only ridden the Shimano approach. I'm sure EPS is lovely in its own right but I sense that Shimano is more refined and they have nailed it better.
I was never sold on electronic for my personal bikes until 9070 (and 6870) came along. EPS still has a long way to go before I feel the same way about it.
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With the new Pioneer powermeter, the camera, the climbing switch and the sprinting switch as well as who knows what they have coming for a cycle computer I think Shimano is VHS and Campy Beta.
many reasons: the magnet to shut off the campy system is just an extra step you need to do. don't have to do that with dura ace.
the extra hole for charging the frame when using the campy internal battery is a pain. dura ace not needed. just charge from your handlebar location.
the price of the internal eps battery is way too high, but that's because the brain is in the battery. the dura ace one is much cheaper.
performance of di2 is spot on, never have any issues with it. eps, on the other hand, had numerous issues with shifting in the early stages when it first came out.
di2 has UD carbon, which matches the UD carbon of today's frames.
I've had the 7090 (removed at the moment). Currently have 9070 di2 on both my bikes as well as SR eps on my evo and have to say by far the di2 is so much simpler to set up and just shifts perfectly from the get go. Wiring is a cinch as well as set up. EPS is harder to work with only because it reminds me of the older 7090 junction box b with the eps battery having wires sticking out all over the place. The connections are thicker and longer and if your frame has narrow chainstays, it may be impossible to get the plugs, once connected, to fit back into the frame. But that's not a deal breaker, just takes a little longer to install. What bugs me is the adjustment set up of the eps. It's so hard to adjust to get perfect shifting. You cant microadjust the derailleurs like you can with di2. You have to rely on eyeballing the upper pulley to be perfectly aligned with the 2nd and 10th cog.. I mean, it seems easy, but even setting up with the chain off, my shifting is still not perfect, compared to di2, even to this day.
But I do have to say the ergonomics of the eps levers are just simply amazing.
I bought a SR EPS bike in 2012 thinking I should go electronic from with the brand I'm familiar with. The bike was fine in 2012, although I really can't say that electronic was any better than mechanical. However, last season, it just didn't seem to hold a charge. I'd charge it, ride it once, leave it a few days and find it dead when I went to ride again. It's been at the dealer since September trying to find out what's wrong and now they're basically saying nothing is wrong. What a joke!
I'll stick with Campy non-electronic but would love to sell the EPS whereas the Di2 bike is still going strong.
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