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PostPosted: Wed Jul 26, 2017 9:28 pm 
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Apologies if this has been asked before but I want to upgrade my r785 generic shifters to dura ace 9170. I have found a shimano chart that says they are compatible. However the r785 uses the br59 low pressure hose and the 9170 lever uses the new br 90 hose. I have bought the levers separately (without hoses and olives) there is a delay on the dura ace hoses , which standard of hoses should I use and does anyone know which olives and hose connectors are compatible with the new lever?


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Posted: Wed Jul 26, 2017 9:28 pm 


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PostPosted: Wed Jul 26, 2017 9:56 pm 
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Can not really help, but the insert (and perhaps olive as well) is different for each hose type. Perhaps you can use the proper insert + olive at each end? Not sure though..


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PostPosted: Wed Jul 26, 2017 10:12 pm 
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Location: Houston, Texas
Not really an answer, but I have used both the BH59 and BH90 hydraulic hoses with the BR-R785 calipers and found that with the ST-R785 shifters, lever feel is stiffer with BH90 hydraulic hose but there is more modulation with BH59. So mechanically speaking, as long as you are using BH90 hydraulic hose set and hardware, there should not be any issues. That said, tomorrow I will be building up my wife's 2017 Scott Contessa Solace frameset using ST-R9170 shifters with the supplied BH90 hydraulic hose sets and BR-R785 calipers, so will have a definitive answer.

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PostPosted: Wed Jul 26, 2017 10:14 pm 
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Thanks did you get the specific dura ace 9170 for the Scott as they are on back order , or is there an equivalent mtb one I can use ?


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PostPosted: Wed Jul 26, 2017 10:19 pm 
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I mean hose set sorry?


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PostPosted: Thu Jul 27, 2017 1:01 am 
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when i was building up my bike, i had a spare insert that was for a mtb, i forgot what specific model number but it wouldn't fit in the BH59 hose as the bore diameter of the hose was smaller.
so make sure you use the correct insert and olives.


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PostPosted: Thu Jul 27, 2017 3:57 am 
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PaulH wrote:
Thanks did you get the specific dura ace 9170 for the Scott as they are on back order , or is there an equivalent mtb one I can use ?

Althopugh the 9170 shifter set included the BH90 hoses, here in the US I have been able to purchase SM-BH90-SS road hydraulic hose sets from Amazon, but a quick search and I see that only the single hose kit is currently available from Amazon.

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Last edited by ms6073 on Thu Jul 27, 2017 3:38 pm, edited 5 times in total.

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PostPosted: Thu Jul 27, 2017 7:44 am 
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I needed to get the SM-BH90-JK-SSR hoses separately as well, I was told I need these specific ones (there are other SM-BH90-xxx hoses that are not working supposedly).


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PostPosted: Thu Jul 27, 2017 9:28 pm 
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Isn't it only the caliper end of BH-90 that is different? You need straight on connection and the mtb caliper hoses uses the 90 degree banjo type?
Or what else would be different?

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PostPosted: Thu Jul 27, 2017 10:45 pm 
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It's the olive and retaining but which are different which go in to the lever


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Posted: Thu Jul 27, 2017 10:45 pm 


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PostPosted: Fri Jul 28, 2017 1:53 am 
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I wonder if SM-BH90-SBM works with 785 shifters? The banjo will work with the XTR calipers.
Question is how it works in the shifter end?
But then again, if pistons are same size as 785R/RS, what is the benefit of the XTR calipers part from weight?
Some say XTR is less durable than XT, which 785 calipers are based on if i got that correct?

I read all Hope calipers have a different feel than all Shimano calipers. Never had any other disc brakes worth mentioning really, part from 785RS.

I wonder if the brake hose itself (from BH59 to BH90), might do a larger difference in this case, than changing calipers?

Hope could perhaps have designed a larger pistons, 2 piston caliper instead of a 4 piston version.
I wonder if that hadn't also had made a stronger braking force.

This is not easy... Buying into a placebo isn't that appealing :roll:

http://productinfo.shimano.com/#/com/2.4

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