I just go my new bike and have a question that I’m not yielding google results for.
I have Di2 for a triathlon bike and it came with an 11-25 cassette. Sometimes I like to use a different size cassette 11-23 or 11-28. When switching cassettes in and out, do I need to use an app or laptop to communicate this change to the Di2 system or will the Di2 system automatically detect that a new size cassette is now being used?
It is not essential, but you do need to use the eTube software to change the cassette size. The system will still shift perfectly fine, but it will think you are in a different gear ratio, if that matters to you. Also, I do not think that they have a setting for an 11-23 cassette. At least, when I last used mine, I did not see the option in the software.
I think the 11x23 option went away when 9100 came out - there’s no 9100 11x23 cassette.
If you aren’t using syncro shift then no you don’t need to update it. Otherwise see exxxviii’s post if you do.
You may or may not want to adjust your chain length. Depending on how it was sized it might be too short for a 28t or too long for a 23t cog. But again it probably will be ok. I swap on my Tri bike between a 11-25 on the trainer to an 11-28 for my race wheel without having to adjust the chain. I set it up for the 11-28 though with a 53 large chainring a link on the short side though.
I was wondering the same thing. I have no clue what synchro shift is, it I have 11-32 and was wondering if I’d need to “press the button on my little box thing, and fine tune it to a different cassetteâ€. Because of that I haven’t bought different size cassettes (lol, I know). Now I’m thinking my chain may be too long if I do downsize my cassette. (Ugh, something else to tinker with “and see if it worksâ€).
I don’t know how the “software setup†works either. I’ve read about it being plugged into a computer and such (never had that done) and I don’t live near a LBS (closest is over 500 miles away).
It’s be cool if the spacing for shifting was all that mattered and then the junction box button can be used for fine tuning (is that how it works?).
If you have the latest Di2 battery, you can add Bluetooth to your Di2 with either of these parts, and then use the Shimano e-tube project app to change settings and update firmware.
https://bike.shimano.com/...50-di2/EW-WU111.html
https://bike.shimano.com/...50-di2/EW-WU101.html
ETA: Or use the usb charging cable (that came with your Di2 setup) with a laptop and E-TUBE software.
If you have the latest Di2 battery, you can add Bluetooth to your Di2 with either of these parts, and then use the Shimano e-tube project app to change settings and update firmware.
https://bike.shimano.com/...50-di2/EW-WU111.html
https://bike.shimano.com/...50-di2/EW-WU101.html
ETA: Or use the usb charging cable (that came with your Di2 setup) with a laptop and E-TUBE software.
Shiiiiiiiit, I think this overloaded my brain knowing I now have more shit to tinker with. Ugh!!! Just when I think I know what I’m doing…I get reminded I don’t know shit.
Is there really something that significant between cassettes, or this just does the fine tuning so you don’t have to?
If you have the latest Di2 battery, you can add Bluetooth to your Di2 with either of these parts, and then use the Shimano e-tube project app to change settings and update firmware.
https://bike.shimano.com/...50-di2/EW-WU111.html
https://bike.shimano.com/...50-di2/EW-WU101.html
ETA: Or use the usb charging cable (that came with your Di2 setup) with a laptop and E-TUBE software.
Shiiiiiiiit, I think this overloaded my brain knowing I now have more shit to tinker with. Ugh!!! Just when I think I know what I’m doing…I get reminded I don’t know shit.
Is there really something that significant between cassettes, or this just does the fine tuning so you don’t have to?
These updates are optional. The bike will shift just fine with a different cassette.
Think of the TdF riders taking a new wheel after a flat. No guarantee it’s the same cassette sizing…but it shifts just fine.
How do you know which of those you need? Inline seems like the most common sense pick, but now I’m wondering why one would want it hooked up and run in parallel.
Shimano’s Di2 software has nothing to do with tuning.
It does allow you to tell it which cassette ratio you are using so that it will do its synchro shifting properly.
Shimano’s Di2 software has nothing to do with tuning.
It does allow you to tell it which cassette ratio you are using so that it will does its synchro shifting properly.
I know I could google this, but I trust your opinion: so, what is synchro shifting? Is that the “hold the button and it shifts a bunch†or to some predetermined setting off shifting?
I know. I know…I should just google it. I’m chucking as I consider myself ocd when I get involved In stuff, but I try to not “dive in†to some things as they are more complex then simple me needs so don’t get bogged down with trying to figure it out. And now here I am…not knowing. Lol
Synchro shifting means that when you press the button, it goes to the next gear ratio. It may only shift the rear derailleur to the next cog. Or it might shift you to a different cog and shift to a different chainring.
When you change cassettes, you may want to adjust the b-tension screw (not specific to di2). It’s not always required but if shifting performance declines after switching cassettes, that’s the first thing I would change.
How do you know which of those you need? Inline seems like the most common sense pick, but now I’m wondering why one would want it hooked up and run in parallel.
I ran in-line because it was easier to integrate (remember, you will still need another E-TUBE wire from the BT module).
I mounted mine up front to get a good BT signal. I have riding buddies who have hid theirs in the bars or down tube and they still work.
ETA: This also adds on-screen gear position to my Wahoo Elmnt. Not necessary but neat nonetheless.
ETA 2: SyncroShift automatically shifts the front derailleur as you move up/down the cassette. You can change how that happens or just let the stock settings take care of it. With SS enabled, you only have to shift the RD. Note you can always override the system and shift the FD if you’d like. I love SyncroShift…let’s me pretend I’m riding one of those newfangled 1X drivetrains, haha!!
Shimano’s Di2 software has nothing to do with tuning.
It does allow you to tell it which cassette ratio you are using so that it will does its synchro shifting properly.
I know I could google this, but I trust your opinion: so, what is synchro shifting? Is that the “hold the button and it shifts a bunch†or to some predetermined setting off shifting?
I know. I know…I should just google it. I’m chucking as I consider myself ocd when I get involved In stuff, but I try to not “dive in†to some things as they are more complex then simple me needs so don’t get bogged down with trying to figure it out. And now here I am…not knowing. Lol
Synchro shifting is basically making your shifts based on gear ratios, so instead of worrying about when you should do the FD shift and RD shift simultaneously, it does it automatically based on the cassette you run. I really like it. You can also customize it so it shifts the FD and RD at specific ratios. I also run the older front TT brakes which have 2 buttons, so you can run synchro but i have the other button control the FD only so I have best of both worlds. Personally I do not know why they went to 1 button only as the extra control is nice. Also the BT can be used to customize the button to say control the head unit.
As for the mechanical details, I am not 100% sure if there is a slight impact on shifting performance if you change the cassette and do not update the shimano A junction. Only reason I say this is because there might be a slight FD/RD compensation that occurs based on the different chain line optimization when you change cassette sizes.
Synchro shifting means that when you press the button, it goes to the next gear ratio. It may only shift the rear derailleur to the next cog. Or it might shift you to a different cog and shift to a different chainring.OOOOOHHHH, I know what you’re talking about. Thank you!!