Weight Weenies

Has anyone tried the new Dura Ace 9100 11-30 cassette with the prior Di2 9070 rear mechanical. Would really like to run 53/39 up front and a 11-30 cassette at the rear but do not want to spend the money to upgrade from 9070 to 9150. Any advice would be appreciated.

i guess it depends on your frame/hanger geo. previously i have ran sram xg1190 11-30 with 6870 short cage rd on my tcr - no problem at all after a little b-screw adjustment.

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I have two bicycles. Colnago C59 size 48 sloping and a Tarmac S-Works size 52cm. Both have Shimano Dura Ace Di2 9070. I am currently running Dura Ace 9000 11-28 cassettes on each bike. Would like to swap to 11-30.

Have a cervelo S5 and a Pinarello F8. Both with 9070. Both can fit 11-30 cassette. I know some people have fitted an 11-32 on but I think that is pushing the limits. Look at RoadLink too if you are having problems.


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I use the SRAM RED 11-30 with 9070 SS RD

RD-9150 with 11-40 cassette.....Only tested on support
https://youtu.be/vW2MUUVvFOs

Ritxis wrote:RD-9150 with 11-40 cassette.....Only tested on support
https://youtu.be/vW2MUUVvFOs

It looks like the chain was on the small ring. So what happens if he accidently shift to the big big combination

I have ran 11-34 with 9070 using a Wolftooth RoadLink. This is only a temporary solution when I need a 11-34 for special rides. But I made the chain longer so I don't accidently damage my derailleur or frame if I shift to the big big combination. But since the chain was too long, I cannot use the three smallest cogs when the chain is on the small ring.

I tried this exact combination on my Blue Triad and it does not work. B limit screw all the way out and it still wasn't enough room.

I'm bumping this old topic otherwise I have to start a new one.

Anyone tried the combination with a S-Works Tarmac SL5? I have Dura-Ace Di2 9070, 50-34 en 11-30. However, I can't get to the 30T without the derailleur touching the cassette. What am I doing wrong? B-tension is maxed out.

Officially RD 9070 only support 28T max, but usually a longer bolt for B tension can solve your problem.

MXGimp wrote: ↑

Tue Sep 12, 2017 3:24 pm

I tried this exact combination on my Blue Triad and it does not work. B limit screw all the way out and it still wasn't enough room.

You mean all the way in right?

On my friend's trek domane his 9070 derailleur clears a 32t cassette. He had run both 11-30 duraace and 11-32 ultegra.

Trek has longer hangers.

The best shifting is with a 26-28t cassette. The further away you stray the worse it gets.

I had to quickly build a bike on the eve of a 3 month trip in the high mountains once, had DA Di2 9070 but a SRAM XG1190 11-30 cassette. B-tension all the way in was still not enough with the length of the bike's hanger so I screwed the B-tension bolt from the other side so the bolt head added to it's effective length, shifting was maybe a little less crisp in the smallest cogs as the top pulley starts to be a little far from the cassette there but it worked flawlessly.

I'm running this combo on an Allez Sprint rim brake with no issues. Barely needed any b-screw adjustment.

Wolftooth Roadlink? RD-8050-GS?

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I'm running an 11-30 with DA 9000 rear derailleur and 52-36 up front on tarmac sl6 with no issues so I would assume it should work fine on the 9070.