Hope RX4 Caliper

Discuss light weight issues concerning road bikes & parts.
Jengaback
Posts: 92
Joined: Thu Jan 29, 2015 9:17 pm

by Jengaback

Klaster_1 wrote:
TobinHatesYou wrote:
Tue Sep 25, 2018 1:54 am
The Hope RX4 flat-mount calipers can't be adapted down to 140mm and all you have to do is look at a photo to see why.
What about using rear flat mount caliper in front with an adapter bracket (bought separately, SRAM sells those), anyone tried that? Or front/rear FM calipers have a design feature that makes such a combination unusable?
This is very possible. For shimano the calipers are the same and its just the adaptor that changes. looking at the rear hope caliper if you had the front shimano or sram adaptor you could use it on the front

by Weenie


TobinHatesYou
Posts: 1873
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Jengaback wrote:
Tue Sep 25, 2018 7:06 am

This is very possible. For shimano the calipers are the same and its just the adaptor that changes. looking at the rear hope caliper if you had the front shimano or sram adaptor you could use it on the front

I don't see how this is possible.

A rear RX4 caliper already has a built in angle and height offset for 160mm rotors. You cannot take that offset away and therefore you cannot use a standard Shimano/SRAM front adapter on an RX4 caliper. It would be equivalent to using a Shimano/SRAM caliper with both a rear 160mm adapter and a front adapter.

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Klaster_1
Posts: 419
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

TobinHatesYou wrote:
Tue Sep 25, 2018 7:59 am
A rear RX4 caliper already has a built in angle and height offset for 160mm rotors.
A-ha, so FM RX4s are 160mm only, the official page and Bikerumor confirm that. I though that was the case for the front caliper only. For 140mm in the rear you'd have to use a PM caliper with a FM to PM adapter.

PaulH
Posts: 58
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

PaulH wrote:I’m having problems with disc rub after fitting any tips for getting the pads to retract a bit more , done the business card trick etc shimano postmount, can’t get the pads to retract enough


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TobinHatesYou
Posts: 1873
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

PaulH, I can only recount my horrible experience (and to an extent, my friend dvq's.) We both had issues with pistons getting sticky and not retracting fully. I had problems with multiple RX4 calipers where the same exact pistons would get stuck either from first installation or after a couple hundred miles. I was in contact with someone from Hope Tech USA for a couple weeks, but I guess eventually he figured I was lying about my problems and he stopped replying.

I've never had such a bad experience with a finished/shipping product before...such an incredibly bad experience and I'm back on SRAM calipers now.

Maybe one day Magura will make road calipers...

morrisond
Posts: 780
Joined: Thu Mar 25, 2004 8:34 pm

by morrisond

PaulH wrote:
Tue Sep 25, 2018 9:12 am
PaulH wrote:I’m having problems with disc rub after fitting any tips for getting the pads to retract a bit more , done the business card trick etc shimano postmount, can’t get the pads to retract enough


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Try slightly loosening the caliper mounting bolts and then spin the wheel - the rotor will hit the offending pad and move itself into alignment.

PaulH
Posts: 58
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

Thanks I’ll give it a go


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PaulH
Posts: 58
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

Sorted by following their YouTube video, the calipers have so much more power than the 785 I’ll report back after first ride tomorrow and see if I have any of the sticky piston problems.


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Hexsense
Posts: 557
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

Rear flat mount looks good, i wonder if it has lower rear profile than a TRP spyre.
I have a bike that has an extremely tight space in rear triangle area. TRP Spyre fit in there but most other calipers hit the seatstay.
Hopefully this is a hydraulic alternative for my bike.

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Klaster_1
Posts: 419
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Hexsense wrote:
Tue Sep 25, 2018 11:05 pm
I have a bike that has an extremely tight space in rear triangle area. TRP Spyre fit in there but most other calipers hit the seatstay.
My rear RX4 was a tight fit, the post mount eyelet closest to seatstay has almost no clearance to it.

PaulH
Posts: 58
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

Been riding the hope rx4 for a couple of weeks now , so much better than shimano r785 lots more power and no rub.


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Broady
Posts: 302
Joined: Thu Jan 03, 2013 5:02 pm

by Broady

Good to hear, I'm just waiting on a R9170 lever then I'll get the LBS to order me some.

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onemanpeloton
Posts: 94
Joined: Wed Jul 12, 2017 11:30 am
Location: Edinburgh, UK

by onemanpeloton

Sorry for the bump guys

Just received my shimano rx4s and found that the m5 fitting you need for the syringe tube isnt included

Whats more, i cant find anywhere to buy one. Help?!
2017 Giant TCR Disc
2015 Giant TCX
2016 Cube Stereo 140

scale29
Posts: 70
Joined: Sat Jun 04, 2011 5:40 pm

by scale29

Just call Hope in the morning, they'll answer your question in a few seconds. That's the advantage of Hope, you can pretty much talk to the person who made it if you ring up.

by Weenie


PaulH
Posts: 58
Joined: Mon Jul 10, 2017 9:50 pm

by PaulH

I used the epic universal bleed kit it has all the bits you need , see amazon


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