XTR brake calipers on a road bike

Discuss light weight issues concerning road bikes & parts.
tomee
Posts: 151
Joined: Thu Oct 16, 2014 8:52 am

by tomee

considering doing this as well but cant be stuffed with doing the hoses again.

has anyone actually weighed a XTR M9000 caliper?

my RS-785 caliper comes in at 110g a side and the RS-805 is 111g a side

Bhaalgorn
Posts: 25
Joined: Mon Jun 05, 2017 2:10 pm

by Bhaalgorn

ms6073 wrote:
Bhaalgorn wrote:Turns out, pretty much any XT/XTR caliper can be used with the Shimano hydraulic road levers so long as you use the BH59 hose kits according to the folks at Shimano.

Curious, as I thought Shimano was now recommending the BH90 hose kit for road/cx hydraulic setups? We have two cross bikes with ST-R785 shifters and RS785 calipers. My bike was the guinea pig and uses BH59 hose kit and just recently converted my wifes bike from DA9000 with Juintech to the Di2 hydro setup with BH90 hose kit. While my levers have more modulation, her bike has, albeit less lever travel, a much stiffer feel, when squeezing to achieve brake lock, almost considering replacing my hoses with the BH90 kits.

Very interesting. I agree that my R785 levers + RS785 calipers + BH59 hoses are a bit more squishy than I'd prefer. Shimano customer support recommended this, and it's reinforced in their literature:

http://si.shimano.com/pdfs/dm/DM-BR0004-05-ENG.pdf
http://si.shimano.com/pdfs/ev/EV-BR-RS785-3743D.pdf

Now I've very curious about switching to BH90 hoses. Let me know if you do and your experience.

by Weenie


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ms6073
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Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Not sure where I had read about Shimano advocating BH90 hoses over BH59 for road applications (might have been a previous WW disc brake thread_), but I do find it interesting that the 9150 Di2 dealer manual references BH90, not BH59.
Last edited by ms6073 on Wed Jun 07, 2017 1:36 am, edited 1 time in total.
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CallumRD1
Posts: 131
Joined: Mon Apr 03, 2017 2:54 pm

by CallumRD1

Can the BH90 hose be retrofitted onto a 685/785 lever/caliper set without changing anything else? It has the same inner and outer diameter and takes the same olives? My bike currently has the BH59 hose and I'd love a firmer brake lever feel.

ooo
Posts: 632
Joined: Sat May 21, 2016 12:59 pm

by ooo

R785 + SLX calipers + BH90 hoses
works fine

ms6073, new dura ace hydro recomends bh90, because it's better
it's like they are using better shifting cables in d-a groupset vs other groupset, and they don't want you to know that you can improve shifting buying just cable

it's hard to buy xtr caliper without brake lever
'


MichaelB
Posts: 489
Joined: Tue Apr 22, 2008 4:31 am

by MichaelB

Just checked my notes re the weights of the different calipers and pads

Zee Caliper (bare) : 127g ea
Shimano pads, springs & split pin : 24g (set - unfinned)
Uberbike pads, springs & split pin : 23g (set)

RS785 caliper & Bleed block : 117g
Shimano finned resin pads + springs : 21g (set)

Difference between Zee vs RS785 : 151g vs 138g per axle

The RS685 levers were 325g ea

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Klaster_1
Posts: 423
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1


Both CRC and R2 claim 91g for caliper including pads, which doesn't go well with this post. Unfortunately, I couldn't find any caliper-only photos laying around. Banjo and olive hose mounts should be factored in total weight too.

Ticlimax
Posts: 91
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

Klaster1 wrote:

Both CRC and R2 claim 91g for caliper including pads, which doesn't go well with this post. Unfortunately, I couldn't find any caliper-only photos laying around. Banjo and olive hose mounts should be factored in total weight too.


It would be nice if we had more independently weighed calipers. No one with 160 euro te spare to check it out? :).

ooo
Posts: 632
Joined: Sat May 21, 2016 12:59 pm

by ooo

SM-BH90 - recommended hose for new ultegra r8020/r8070

viewtopic.php?f=3&t=142468&p=1322662#p1322662
'

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wheelsONfire
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Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

So, does this translate to BH-59 for modulation and BH-90 for more bang on braking?
I would easily go for modulation. When i rode MTB it was rim brakes and the disc brakes we have now, is already great.
I wonder, is any 4 piston brake only made for more braking power (compared to 2 piston ditos)?

Seems more pistons could be cause for more problems to.

A pity XTR 9000 isn't available with straight connection ala RS 785.
I was told no matter what caliper we go for, distance between pads and discs will not increase?
If so, that's a bummer...
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kode54
Posts: 1329
Joined: Tue May 23, 2006 9:39 pm

by kode54

has anyone used mixed rotor sizes on their road bikes? 160 front and 140 rears? or since i'm 150 lbs, 140 is adequate for front and rear?

i'm setting up a new bike...and going with disc brakes so i can ride more in bad weather. had a few close calls and one crash with rim brakes.
- AX Lightness Vial EVO D + DA9150 + Enve SES 4.5 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Guru Praemio R Titanium + DA9150 + Enve 3.4 CK hubs

romalor
Posts: 251
Joined: Sun Jul 26, 2015 3:56 pm

by romalor

depending where your ride ( D+ D-)
140 140 could be enough
or not

ooo
Posts: 632
Joined: Sat May 21, 2016 12:59 pm

by ooo

2007 xtr uses straight connector (2 versions: pm, is), weight IS≈80g, PM≈84g
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MichaelB
Posts: 489
Joined: Tue Apr 22, 2008 4:31 am

by MichaelB

kode54 wrote:has anyone used mixed rotor sizes on their road bikes? 160 front and 140 rears? or since i'm 150 lbs, 140 is adequate for front and rear?
...


I've had 160/140 on my bike and I'm 95kg and like climbing and descending (a bit slow at the climbing part ... :roll: ).

Just started testing a Vitus Vitesse EVO disc bike at the moment and that has 140/140 with RT86 IceTech rotors.

At 150lb, shouldn't be an issue, but as mentioned, depends where/how you ride

by Weenie


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