Hope RX4 Caliper Postmount for Hydraulic Disc Brakes - silver

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Description of Hope RX4 Caliper Postmount for Hydraulic Disc Brakes - silver

The Hope RX4 is a drop bar compatible 4 piston disc brake caliper specially designed to work with Shimano or SRAM brake lever master cylinders, aimed for Road and Cyclocross use.
Its slimline 4 piston design allows an effectively weight reduction. While a Monobloc construction provides more stiffness reducing the fuzzy lever feel. Furthermore the RX4 offers increased piston retraction, meaning the pads move further into the bore, away from the rotor, which will reduce brake pad rub. The design of this caliper allows pressure to be spread over the 2 smaller pistons each side of the caliper which allows for a larger pad, offering greater pad to disc contact which increases brake friction and results in better brake feel and modulation at the lever. Additionally a larger pad will also help dump heat quicker than a small pad.

Specifications

Shimano compatible caliper
The RX4 Shimano caliper can replace the following Shimano caliper references: BR-RS785, BR-R785

This caliper version is especially designed for Shimano main pistons and features, compared with the SRAM version, larger pistons.

RX4-SH caliper will only work with mineral oil brake fluid.

SRAM compatible caliper
The RX4 SRAM caliper can replace the following SRAM calipers: Force, Red and Rival

This caliper version is especially designed for SRAM main pistons and features, compared with the Shimano version, a little bit smaller pistons.

RX4-SR caliper will only work with DOT4 or 5.1 brake fluid.
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Fact Sheet of Hope RX4 Caliper Postmount for Hydraulic Disc Brakes - silver

Product Name: Hope RX4 Caliper Postmount for Hydraulic Disc Brakes - silver
Manufacturer: Hope
Item Code: HOP317320
Year: 2017
Material: 2014 T6 Aluminium
Weight: approx. 123 gram (Shimano version)
weighed by Bike24)
Fitting for FW/RW: Front & Rear Wheel
Brake caliper: RX4 (4 pistons)
Braking pads: organic
Shimano: HBSP323R
SRAM: HBSP359
Brake fluid: DOT 5.1 ||| DOT 4 ||| Mineral oil
Included in delivery: 1 brake caliper incl. aluminium bleed block, hose assembly
Manufacturer page: http://www.hopetech.com
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Selection: Hope RX4 Caliper Postmount for Hydraulic Disc Brakes - silver
Currently not in stock Production, delivery time 8-9 weeks Version SRAM (DOT)
Currently not in stock Production, delivery time 8-9 weeks Version Shimano (Mineralöl)
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Customer Reviews
Excellent
Wonderful! Bought as a last-ditch effort to improve the Shimano M785 rear brake that came with my bike. Took me far too long to realise that the original was leaking oil onto the pads, leaving me with shrieking, ineffective breaking. Surprisingly, this seems to be a relatively common problem.

The Hope one is superb - fit and forget. Works just like a disc brake should! Powerful, quiet, reliable braking. Wet or dry. Wonderful. Some day I'll replace the front too.
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