R785 vs R9170 Shifters

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justaute
Posts: 282
Joined: Fri Jan 04, 2013 7:17 pm
Location: UT/TX/PA, USA

by justaute

kode54 wrote:
ms6073 wrote:
PaulH wrote:9170 levers so much lighter and better lever feel.

Wife's bike has 9170 and mine has R785 and the first thing I noticed when I built her bike were that the hoods/body was slightly narrower as well. Have not been able to find these in the US, but was able to order a retail box set (shifters, hydraulic hose, mineral oil) from a Japanese Ebay store and should be swapping mine out in a few days.


can't find them either and most ship in september.


Kode54...bike-components seems to have them.

https://www.bike-components.de/en/Shima ... er-p51456/

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Delorre
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by Delorre

PaulH wrote:I'm using 785 as the dura ace won't fit my frame


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You just swapped the shifters to 9170 and continue to use your current (BH59?) hose kit? Or did you also upgrade those to BH90 hoses?

PaulH
Posts: 77
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

You have to update to bh90 the 59's are the wrong size for the lever


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ms6073
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by ms6073

PaulH wrote:You have to update to bh90 the 59's are the wrong size for the lever

Not sure I follow this. While the BH-90 is supposed to be a bit stiffer hose, the external hose diameter is nearly identical, the olives are used interchangeably, so the only real difference is the hose connector inserts/barbs, with the SM-BH90-JK-SSR having a slightly increased inner diameter.
- Michael
"People should stop expecting normal from me... seriously, we all know it's never going to happen"

PaulH
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Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

It's the threaded connectors which go in to the levers which are different they didn't deal with mine and you can't buy seperately


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PaulH
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Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

It's the threaded connectors which go in to the levers which are different they didn't deal with mine and you can't buy seperately


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ms6073
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by ms6073

Right, sorry. :oops:
Having only done the one set of shifters, I forgot that the Flange Connecting Bolt which is an M9 threaded connector required for the ST-R9120/R9170/R8020/R8070, is supplied with the brake host kit, not the shifters.
- Michael
"People should stop expecting normal from me... seriously, we all know it's never going to happen"

tomee
Posts: 220
Joined: Thu Oct 16, 2014 8:52 am
Location: AUS

by tomee

so could you not use the existing BH59 insert and just use the threaded connector from the new 9170 levers?

Only reason i ask is i want to do this but i had to araldite my brake hose to the bottom bracket of my CAAD12 (due to clearance issues and stiff hose) and cbf removing the whole hose.

PaulH
Posts: 77
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

You probably could but I think the internal diameter of the 90 is different making it a higher pressure , I read somewhere that this gives it a more powerful feel. All I know is that it works very well with the 90 so could be worth holding on


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ms6073
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by ms6073

tomee wrote:so could you not use the existing BH59 insert and just use the threaded connector from the new 9170 levers?

Wife and I have the Di2 R785 shifters and BR-RS785 post-mount calipers on our cross/gravel bikes. I used BH-59 hose on mine and after a thorough effort bleeding the system as outlined in the Dealer Manual, lever feel/modulation is good. I used BH-90 hose when I installed the levers and calipers on the wife's bike, and after bleeding in the same manner, the lever feel for her bike is better/much stiffer, and the same goes for her road bike with R9170 shifters, BR-RS805 calipers, and BH90 hose versus my road bike with R785 shifters, BR-RS805 calipers, and BH-59 hoses.
- Michael
"People should stop expecting normal from me... seriously, we all know it's never going to happen"

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ms6073
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by ms6073

tomee wrote:so could you not use the existing BH59 insert and just use the threaded connector from the new 9170 levers?

While I would not recommend it as the internal diameter of the BH59 hose is larger than the BH90, the answer is probably yes. The problem lies in the fact that as I found out yesterday, in the case of a fresh install, the larger Flanged connecting bolt that connects the hydraulic hose to the shifter, is supplied with the Shimano SM-BH90-JK-SSR Disc Brake Hose Kit, not the Dura-Ace R9170 shifters.
- Michael
"People should stop expecting normal from me... seriously, we all know it's never going to happen"

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