Weight Weenies

Ok Thanks. I plan to upgrade my ST-9170 shifters to ST-9270 without changing BR-R9170 calipers. So I can do it without any fear !

It would be nice to have the levers 12s levers working on 11s groupsets, just like SRAM did with red etap and red axs.

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Xabi wrote: ↑

Fri Jun 02, 2023 10:55 pm

It would be nice to have the levers 12s levers working on 11s groupsets, just like SRAM did with red etap and red axs.

12s Hydro levers or 12s rim brake levers? They couldn't make the hydro levers work because there's no bluetooth receivers in the 9100 derailleurs.

12 speed hydro di2 for 11 speed hydro di2 groupset.

Xabi wrote: ↑

Sat Jun 03, 2023 4:44 pm

12 speed hydro di2 for 11 speed hydro di2 groupset.

What about Shimano compatibility chart?
https://productinfo.shimano.com/#/com?a ... &cid=C-453

If I'm upgrading from mechanical ultegra r8020, to new ultegra r8170 and already have compatible cranks/rings (rotor aldhu), do I just need shifters, chain, derailleurs, and cassette? Will the disc brakes be fine on the new shifters? Obviously I'll need the new battery/wires as well. Anything else I'm missing?

If you mean disc brake calipers from old 11 s groupsets, NO, they are not compatible.

So again.
https://productinfo.shimano.com/#/com?c ... acid=C-456

I currently have r8070 Di2 on my road bike. How much of a step up do you think r8170 12 speed is? Is it worth upgrading from a performance perspective or should I save my money?

How much of a step up in performance is r8170 12 speed compared to r8070 11 speed? I have 8070 on my road bike and am contemplating the upgrade...

I have both.

The best "upgrade" of 11s vs 12s Ultegra is the brake calipers. Better clearance, less anoying rubbing sound. 12 speed calipers work with 11 speed levers, so you can just upgrade those for a much reduced cost vs full groupset upgrade (did that on my 11s setup).

The rest are very small improvements (and some tradeoffs), not worth the money (in my opinion) if you're happy with your current setup.

harblhat wrote: ↑

Sun Jan 08, 2023 5:51 pm

The chainring spacing is different between 11 to 12 speed. 12 speed chainrings are closer together. Front shifting will work, but not perfectly.

This is probably the biggest dissapointment for a lot of us as it precludes us from using our existing 11 cranks with expensive power meters/arms.

Is anyone using their 11 cranks with 12 sp Di2 successfully without issue?

BikeEatSleepRepeat wrote: ↑

Mon Jul 24, 2023 5:26 pm

This is probably the biggest dissapointment for a lot of us as it precludes us from using our existing 11 cranks with expensive power meters/arms.

Is anyone using their 11 cranks with 12 sp Di2 successfully without issue?

It works, but not as well as it should. I used 9100 cranks with 12s DA Di2 for most of a season and got crisp front shifts maybe half the time after pushing the FD high limit far out beyond the 0.5-1mm spec. The rest either hesitated or had a bit of grinding before completing the shift. I found the smoothest way with that combo was to softpedal during the shift, like the old days. Of course, if you've spent $$$ on a 11s PM crankset, such compromises are not really acceptable.

What about the effects on chainline, if any?

When I'm riding 50t chainrings on 12s I seem to be in the 9th or 10th cogs of the cassette if pushing on and that is quite a skewed chainline. I wouldn't want to make it any less efficient with 11s chainrings.

Chainline moved from 43.5 to 44.5mm from 11 to 12 speed, so cross chaining will be slightly less pronounced if you are using an 11s crankset with 12s parts

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Has anyone tried 12-speed callipers with 11-speed? It seems there is a lot of travel in the lever before it starts braking. Way more than I remember with 11-speed callipers.