Back by popular demand, the general all-things Road forum!
Moderator: robbosmans
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ms6073
- Posts: 4290
- Joined: Fri Jul 23, 2004 8:24 pm
- Location: Houston, Texas
by ms6073 on Wed Jul 26, 2017 3:42 am
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
"People should stop expecting normal from me... seriously, we all know it's never going to happen"
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Broady
- Posts: 678
- Joined: Thu Jan 03, 2013 5:02 pm
by Broady on Thu Feb 21, 2019 10:30 am
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.
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wheelsONfire
- Posts: 6283
- Joined: Mon Jul 07, 2014 8:15 am
- Location: NorthEU
by wheelsONfire on Thu Feb 21, 2019 10:51 am
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 (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
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wheelsONfire
- Posts: 6283
- Joined: Mon Jul 07, 2014 8:15 am
- Location: NorthEU
by wheelsONfire on 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?
Bikes:
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
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Klaster_1
- Posts: 1390
- Joined: Mon Aug 15, 2016 10:25 am
- Location: Paphos, Cyprus
by Klaster_1 on Thu Feb 21, 2019 11:58 am
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.
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wheelsONfire
- Posts: 6283
- Joined: Mon Jul 07, 2014 8:15 am
- Location: NorthEU
by wheelsONfire on Thu Feb 21, 2019 12:24 pm
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 (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
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mattr
- Posts: 4671
- Joined: Fri May 25, 2007 6:43 pm
- Location: The Grim North.
by mattr on Thu Feb 21, 2019 12:41 pm
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.
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kode54
- Posts: 3749
- Joined: Tue May 23, 2006 9:39 pm
by kode54 on Thu Feb 21, 2019 7:30 pm
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.
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sorenanker
- Posts: 11
- Joined: Sun Mar 17, 2013 2:40 pm
by sorenanker on Sat Mar 20, 2021 5:27 pm
Following up on this thread.
Waiting for a BreadWinner Lolo Disc, and suddenly realized that they stick to IS mount on the rear, so i'm looking for alternatives to the flatmount DA calipers i had in mind.
Thinking of putting DA 9170 levers with XTR br9100 calipers with straight hoses. From what i understand the BH90 hoses are the way to go for this - but is there anything else i should be aware of?
Stinner Refugio Disc
Breadwinner Lolo Disc
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justillo28
- Posts: 4
- Joined: Wed Jan 15, 2020 11:03 am
by justillo28 on Mon Nov 20, 2023 9:29 am
sorenanker wrote: ↑Sat Mar 20, 2021 5:27 pm
Following up on this thread.
Waiting for a BreadWinner Lolo Disc, and suddenly realized that they stick to IS mount on the rear, so i'm looking for alternatives to the flatmount DA calipers i had in mind.
Thinking of putting DA 9170 levers with XTR br9100 calipers with straight hoses. From what i understand the BH90 hoses are the way to go for this - but is there anything else i should be aware of?
I'm interested in use Ultegra R8070 shift levers with brakes XTR BR-M9100.
Is this an inmprovement?
Which are the BEST Road calipers?
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Aeo
- Posts: 668
- Joined: Wed May 25, 2016 2:06 am
by Aeo on Mon Nov 20, 2023 9:38 am
The best are Trickstuff C22 Flatmount. Only problem is availability and finding shops, especially if you are outside of Europe.
Another aftermarket caliper is the Hope RX4+, which will be easier to find.
Current generation Shimano brakes, BR-R9270, are a good choice and the easiest swap.
You can also run Campagnolo (Magura) calipers:
https://velo.outsideonline.com/road/roa ... -mash-ups/
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