electronic Dura Ace

[redrhodie]

Isn't cross-chaining about the lateral stress on the chain - with derailleur rub and trim just being a little "warning" that you're getting into the extremes?

Yes, I just called my shop, and you'll still have lateral chain wear from the extreme angle. But, maybe since you're not hitting the side of the derailleurs, you're not getting that additional wear and tear? I didn't get to ask him that. In any case, it's really precise, and can handle the shift from small to large chain ring in any gear without any effort. I think even when climbing, you don't have to ease up on your pedal when front shifting. I read that in this review:

http://www.bicycling.com/article/0,6...7875-1,00.html

I'll keep my old Ultegra until it dies, and probably get the same level components next time. But, I can see the appeal. If you're a (rich) tech geek, you're going to love this. I'm neither, but it was fun to try!

[dianne_1234]

I have Dura-Ace Di2 (electronic) on a long-term loaner bike. I've done about 6 rides, or roughly 200 miles on it I'd guess.

To redrhodie: Thanks for your review, I too loved it the moment I started riding it.

To smilingcat: It's not wireless, no issues near any power lines (or anywhere for that matter) on any of my rides.

Buuuut...

While I had the loaner bike with Di2 I didn't ride it for month (travel for work) and the battery went dead. A few rides later I was again off the bike for several weeks and the battery was almost dead.

So, based on this I think, if you ride frequently it could be fine; recharge every couple of weeks or whatever. But on my infrequent riding schedule I felt it had to be recharged every "couple" of rides, which for me made it more hassle than I want.

Hope my experience helps!

[Maxxxie]

What happens when the battery goes dead? Does the bike become unrideable (or, more to the point, a single speed)?

Max

[Bike Chick]

I wonder what would happen on a week long bike tour like RAGBRAII? We had problems trying to find a place to charge our Garmin bike computers every night. I can ride without my computer but what if my bike needs a charge and you don't have access to electricity?

[redrhodie]

I wonder what would happen on a week long bike tour like RAGBRAII? We had problems trying to find a place to charge our Garmin bike computers every night. I can ride without my computer but what if my bike needs a charge and you don't have access to electricity?

Maybe something like this would work, if you have access to a car? This charges batteries from the car's lighter:

http://www.technooutlet.com/wgn67.ht...=19-30891654-2

[wildeny]

How about DIYing the electronic shifting system on your bike for €50?



Check out these:
Homemade Electronic Shifting Bicycle From Germany - Part I
DIY Electronic Shifting Bicycle Part II

He (Norbert) even made his own bike.

[sundial]

What happens when the battery goes dead? Does the bike become unrideable (or, more to the point, a single speed)?

See that's what I am afraid of. Imagine it conking out on a long climb and you're MILES from home.

[BikeShopGirl]

The battery takes a while to die, between 600-1,000 miles is normal life of a battery charge. There are also charge lights. If you are really worried about it, the batteries are small, think old school Nokia cell phone battery. On a long ride, put it in your seatbag.

The derailleur also stays in the position it was in before it died. So if you are starting to see a red blinking light, keep it in an easier gear in case it dies.

>>>
I've only seen Di2 on a Cervelo P4 we built up in the shop. It was ubber cool and amazing to look at. The coolest thing was the self trimming feature the front derailleur has. When you are in that 3rd or 2nd to last cog, it self trims the front derailleur.

For pictures -----> http://arsbars.com/?s=di2

[Dogmama]

I just saw one in action at my Trek LBS. It is way cool. You can hear a small electronic whirring sound when it trues up the front sprocket. It would be great for my arthritic hands because it just takes a very light push. I asked him about battery life & he said "forever" - hmmm...that's a long time. After reading this thread, I'll have to grill him a tad more about that.

One of the cool things is that because it's electronic, you don't have a cable to stretch out. It's just a wire & with the Madone, it is inside of the frame.