XTR brake calipers on a road bike

Discuss light weight issues concerning road bikes & parts.
User avatar
ms6073
Posts: 2694
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

kode54 wrote:has anyone used mixed rotor sizes on their road bikes? 160 front and 140 rears?

A friend who is very tall (198 cm), has a BMC Road Machine disc and that is how his came from the factory. He recently completed a very mountainous week long tour along the Blue Ridge Parkway in North Carolina and said his bike worked flawlessly up and downhill.
Michael - The Anaerobic Threshold is neither...

flyordie
Posts: 1
Joined: Wed Feb 20, 2019 2:15 am

by flyordie

Has anyone used XTR 9100 with Dura Ace 9170 levers? From my research that should work... What do you guys think?

by Weenie


Broady
Posts: 346
Joined: Thu Jan 03, 2013 5:02 pm

by Broady

flyordie wrote:
Wed Feb 20, 2019 11:33 pm
Has anyone used XTR 9100 with Dura Ace 9170 levers? From my research that should work... What do you guys think?
Pretty sure that would be fine. I have used XT calipers in the past.

User avatar
wheelsONfire
Posts: 2643
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

I called Shimano overhere and asked about the XTR calipers for my 6870 (i have a set laying here).
Shimano, during discussion told me there are no spare parts for sale for XTR?
Also, the mech in our Shimano center, told me there's less oil in the reservoir?
They are less durable, in search for weight savings, some less durable materials have been used?

I know you'd best use another hose and need new nipples and inserts.
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

User avatar
Klaster_1
Posts: 610
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

wheelsONfire wrote:
Thu Feb 21, 2019 10:51 am
XTR calipers for my 6870
6870 are rim brake...

User avatar
wheelsONfire
Posts: 2643
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

I have 6870 with 785 shifters and those are disc brakes.
How do you use XTR calipers with 6870 rim shifters?
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

User avatar
Klaster_1
Posts: 610
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

wheelsONfire wrote:
Thu Feb 21, 2019 11:13 am
I have 6870 with 785 shifters and those are disc brakes.
How do you use XTR calipers with 6870 rim shifters?
Surely you mean BR-R785 or BR-785, that's what ST-R785 used to come with. Shimano made no 6800-series disc brake parts, only non-series.

User avatar
wheelsONfire
Posts: 2643
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

Yes, those are the calipers i have. The black RS version, non banjo. But i also have XTR BRM 9000 calipers (as spare).
Both post mount if that matters!?
But the shifters are Shimano Road Di2 ST-R785.
I meant the groupset otherwise are 6870.
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

fromtrektocolnago
Posts: 1132
Joined: Sat Dec 07, 2013 10:15 pm

by fromtrektocolnago

My understanding is that 9100 and 9000 are fully compatible
Colnago C-59 (Dura Ace)
Firefly(Ultegra)
Colnago C-64 disc(ultegra) with Bora 35 wheels

mattr
Posts: 4474
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

wheelsONfire wrote:
Thu Feb 21, 2019 10:51 am
Shimano, during discussion told me there are no spare parts for sale for XTR?
Your importer might not bring in the part assemblies (caliper/lever/hose kit) but you can get them in much of europe. Technically, shimano provide no "spares" for most of their brakes. Just the assemblies. You want a seal, or a piston, you're shit out of luck.
wheelsONfire wrote:
Thu Feb 21, 2019 10:51 am
Also, the mech in our Shimano center, told me there's less oil in the reservoir?
Doesn't really make any difference, the stroke/bore of the piston is exactly the same. If it was different, you might eventually drain the reservoir completely, before the pads wear out.
wheelsONfire wrote:
Thu Feb 21, 2019 10:51 am
They are less durable, in search for weight savings, some less durable materials have been used?
And? Don't leave them coated in shit or treat them like a 20 euro set of BSO brakes and they'll last for years.

Ritxis
Posts: 314
Joined: Fri Jun 01, 2012 3:00 pm
Location: San Sebastian

by Ritxis

I used brakes SLX M7000 with R8070 levers, no problem

kode54
Posts: 1559
Joined: Tue May 23, 2006 9:39 pm

by kode54

The previous road hydraulics used the BH59. On the BH90, when I cut the hoses, I see that the insides are slightly different. Looks to be more of a reinforced hose. Because I didn't want to reroute my front hose and bleed them again since there was nothing wrong with it...it has BH59 and the rear I had to redo and that I put BH90. There is a firmer feeling with the braking...but can't be certain as there's more hose length to the rear than to the front. Although when I had the BH59 on the rear, it didn't feel as 'firm' as the BH90 that I currently have.

I'm certain the hoses are interchangeable, but since the BH90 is a better hose, I think they dropped the BH59 references.
ms6073 wrote:
Tue Jun 06, 2017 9:29 pm
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.
- Parlee Altum + DA9150 + Enve SES 4.5 Ene carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 7.8 carbon hubs
- Moots Vamoots Disc RSL Titanium + DA9170 + Enve 4.5AR CK CL hubs
- Argonaut Spacebike 2.0 + DA9170 + Enve SES 5.6 DT Swiss 240 CL hubs

Post Reply
  • Similar Topics
    Replies
    Views
    Last post