Any mags using Di2?

[jm2e]

Would consider for the wife. If I can pay good money to not hear another thing about how the shifting isn't perfect or how the shifter has stiffened up by 2% ...............
Just need to get past the cost of a broken RD ............
And maybe use a SRAM cassette ............

Winter time foods for thought :you rock:

[dark_star]

I have ultegra Di2. I love it- although I'm coming off a mid 90's dura ace groupset, so a lot has changed. But IMO it's awesome and i am stoked every time i use it. Just get a computer thatbis compatible with the e tube system so you can keep track of the battery life (which is excellent, and the charge time is 4 hours!)

[Dee Hubbs]

I have two Di2s setups on road bikes and have rode, and built many Di2 Mountain bikes.
I will never go back to mechanical on the road, and if i was building a new XC bike I would go Di2 in a heart beat. Perfect shift every single time. Charge the battery 2 times a season (every 1500kms).
You can program synchro shift if you want a 2x and only one shifter. You can have a display box showing what gear you're in.
If you have a cross chainer or a shift masher, the Di2 will solve all of their problems. Easy to set up and no maintenance after that.
To break a Di2 RDs really need to be bash it, tear it off type crash to break it. The crashes and rock smashes that wreck a mechanical RD don't have the same effect on a Di2 RD.

[jm2e]

Mostly interested if it works well for 1x mountain rigs.

I keep reading about how the batteries last for months. Surprised they aren't smaller. Not knowing how heavy they are, my inclination is to lean toward a smaller lighter battery that only lasts a half dozen rides.

I never see the batteries advertised for sale. Do they come with another part, like the shifter or RD?

[Dee Hubbs]

All the di2 parts are sold separately. Its nice to build and buy only the parts you need. For a 1x MTB set up you will need: RD, Battery, Shifter, Display port (or A-junction) and 3 e-tube wires.
Battery is not that heavy, i think 55g. The tricky part is placing the battery if you have a dropper post, if not the seat post is the best spot for the battery.
The battery also has a smart chip in it to control the system, so its not that easy to rig up a smaller and lighter battery.

[dfinn]

The crashes and rock smashes that wreck a mechanical RD don't have the same effect on a Di2 RD.

Why is that?

[Dee Hubbs]

Why is that?

Because a servo moves the derailleur, and not a cable pull. its one less axis to get get tweaked and make the shipping sloppy.

[jm2e]

So, can you bend a Di2 RD and still get good shifting? Because it's all intuitive and shit?

[dfinn]

Because a servo moves the derailleur, and not a cable pull. its one less axis to get get tweaked and make the shipping sloppy.

interesting. I wonder if this actually makes it more sturdy in the real world. I don't need di2 and usually manage to get pretty reliable shifting (I've held out on going to 11 or 12 speed setups) but I've got a few friends that have it and I kind of wish my bike made that futuristic noise every time I shifted.

[Dantheman]

So, can you bend a Di2 RD and still get good shifting? Because it's all intuitive and shit?

Spitballing: If you bend a mechanical RD, it's nearly impossible to set the cable tension so that it will put the RD in the right place across the whole cassette. If I understand the shift mapping and auto-trim features of Di2 correctly, that doesn't matter on a Di2 RD since it just moves the servo as needed to put in the right spot for each gear.

[joetron]

Di2 RDs also sense impact forces and instantly disconnect the servo motor so it doesn't get roasted, this might help with a unimpeded motion that would mitigate bending of bits.
There is a crash recovery mode that recalibrates the RD - just gotta make sure the hanger isn't bent badly enough to send it right into the spokes.