• Gorilla Brakes Enduro Pro Ultimate brake pads for Hope RX4+ and RX4-SH, HBSP323, 37 mm reference
  • Gorilla Brakes Enduro Pro Ultimate brake pads for Hope RX4+ and RX4-SH, HBSP323, 37 mm reference – view 2
  • Gorilla Brakes Enduro Pro Ultimate brake pads for Hope RX4+ and RX4-SH, HBSP323, 37 mm reference – view 3
  • Gorilla Brakes Enduro Pro Ultimate brake pads for Hope RX4+ and RX4-SH, HBSP323, 37 mm reference – view 4
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HOPE RX4+ / RX4-SH – Enduro Pro Ultimate Disc Brake Pads | Gorilla Brakes UK

HOPE RX4+ / RX4-SH – Enduro Pro Ultimate Disc Brake Pads | Gorilla Brakes UK

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Choose this compound if…Maximum power and fade resistance for steep, fast, high-load riding.

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Front + rear?For front and rear, choose 2 packs if both calipers use this pad shape. Check the pack contents below.
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Gorilla Brakes Enduro Pro Ultimate replacement disc brake pads for road and gravel bikes with Hope RX4+ or original RX4-SH (Shimano) calipers. These use the HBSP323 shape with a 37 mm reference width.

Check the caliper name rather than the brake lever name when ordering.

At a glance

Specifications

Compound
Enduro Pro Ultimate
Backing plate
Steel
Pad shape
Hope RX4+ / original RX4-SH — HBSP323 (37 mm reference width)
Riding
Trail, enduro, gravel and compatible e-bikes
Pack contents
2 brake pads and 1 pad spring
Coverage
1 compatible brake caliper

Each pack contains one pair of brake pads (2 pads) and 1 pad spring for one compatible caliper. Order two packs for both brakes only after checking that both calipers use this pad shape.

Check before ordering

Compatibility

For Hope RX4+ and original RX4-SH (Shimano) calipers using HBSP323 with a 37 mm reference width. Check the exact caliper version and complete pad outline. Not for original RX4-SR (SRAM), which uses the smaller HBSP359 shape with a 31 mm reference width. The two shapes are not interchangeable.

Brake familyCompatible calipers
Hope RX4+RX4+ mineral-oil and DOT versions using HBSP323
Original Hope RX4-SHOriginal RX4-SH (Shimano) using HBSP323

Suitable for compatible e-bike brakes

Enduro Pro Ultimate is an e-bike-rated compound. Use this pad shape only with the compatible calipers listed here, and match the complete brake setup to your bike and total load.

Rotor compatibility

This compound is suitable for all bicycle disc brake rotor types, including rotors marked “resin pads only”.

Rotor diameter and thickness must still meet your brake manufacturer’s specifications. Check the rotor’s condition and minimum permitted thickness before fitting new pads.

Compound performance

Enduro Pro Ultimate

Our published compound testing shows strong braking output as rotor temperatures rise. Enduro Pro Ultimate also achieved the best wear resistance within the bench test group.

These findings describe the samples and setups tested. Actual performance and wear depend on your braking system and riding conditions.

Compound ratings out of 10

These scores describe the friction compound.

Braking performance
10
Fade resistance
10
Heat resistance
10
Lifespan
10
Quietness
8

Ratings from the supplied Enduro Pro compound chart. Higher scores indicate stronger performance in that category; a higher quietness score means quieter braking.

Heat management

Caliper temperature vs rotor temperature

Swipe or scroll sideways to read the whole plot.

All curves shown

Caliper temperature vs rotor temperature Indicative comparison of caliper temperature against rotor temperature, both in °C, for Sintered, Enduro Pro Semi-Metallic, Enduro Pro Resin and Enduro Pro Ultimate. 0 50 100 150 200 250 300 350 400 450 Rotor temperature (°C) 25 35 45 55 65 75 85 95 105 115 125 Caliper temperature (°C) Sintered Enduro Pro Semi-Metallic Enduro Pro Resin Enduro Pro Ultimate SinteredEnduro Pro Semi-MetallicEnduro Pro ResinEnduro Pro Ultimate
All testing is carried out by Adam Read, Hine-R Engineering, Darwen, Lancashire, United Kingdom.
About this test

The horizontal axis shows rotor temperature; the vertical axis shows caliper temperature. At the same rotor temperature, a lower curve means a cooler caliper in this test setup. Consider this alongside braking power, pad life and correct fitment when choosing pads for long descents or heavier loads.

Indicative test comparison. Results relate to the tested samples and setup.

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Compare braking power across compounds

All eight curves use the Shimano XT RT86 rotor. Choose a compound to highlight its tested result.

Why some curves stop earlier

Each test run stopped when the measured caliper temperature reached 120°C, the stopping threshold used to protect the piston seals in this test setup. The horizontal axis shows rotor temperature. Sintered’s shorter curve means the caliper reached the limit at a lower rotor temperature.

Swipe or scroll sideways to read the whole plot.

All curves shown

Gorilla compounds: braking power Bedded-in Gorilla pads tested with the Shimano XT RT86 rotor. Horizontal axis: rotor temperature (°C). Vertical axis: braking power (W), starting at 0. Approximate reconstruction from the supplied test graph. Samples: Enduro Pro Ultimate · Shimano XT RT86 rotor; Enduro Pro Ultimate · Aluminium backing · Shimano XT RT86 rotor; Enduro Pro Resin Black · Shimano XT RT86 rotor; Enduro Pro Semi Metallic Blue · Shimano XT RT86 rotor; Sintered · Shimano XT RT86 rotor; Factory Racing Stealth Purple · Shimano XT RT86 rotor; Factory Racing Green · Shimano XT RT86 rotor; Factory Racing Organic · Shimano XT RT86 rotor. Gorilla compounds: braking power 75 150 225 300 375 450 0 300 600 900 1,200 1,500 Rotor temperature (°C) Braking power (W) Each curve ends when the caliper reaches 120°C, the stopping limit used in this test. Approximate reconstruction from the supplied test image. Y-axis starts at 0.
All testing is carried out by Adam Read, Hine-R Engineering, Darwen, Lancashire, United Kingdom.
About this test

This chart compares braking power for bedded-in pads, all tested with the Shimano XT RT86 rotor. The horizontal axis shows rotor temperature (°C); the vertical axis shows braking power (W). Each curve represents the compound and backing-plate configuration named in the selector. Compare curves within their plotted ranges; no result is shown beyond the end of a curve.

Two Enduro Pro Ultimate results are shown: the main comparison sample and the aluminium-backed sample. Both used the Shimano XT RT86 rotor. Compare each curve as its labelled backing-plate configuration.

Test context: All pads shown can be good choices for their intended use when correctly matched to the bike and rotor, installed and bedded in. A lower or shorter curve does not by itself make a pad a poor everyday choice. Real riding temperatures depend on the route, total load, braking technique and setup; this test does not establish a temperature limit for the average rider. Rotor choice can substantially affect braking power, but these results apply to the tested combinations. This comparison does not guarantee the same improvement on another bike or identify one best pad for every rider.

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Fitting and bedding in

Follow our installation guide, then complete the recommended bedding-in procedure to prepare the new friction material and establish an even transfer layer on the rotor.

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Help & fitting

Get your brakes ready

Check your fitment, prepare your brakes and find support.

Your questions

About these brake pads

Fitment, materials and performance explained.

Which Hope RX4 calipers do these pads fit?

These pads fit RX4+ and original RX4-SH (Shimano) calipers using HBSP323, with a 37 mm reference width. They do not fit original RX4-SR (SRAM), which uses HBSP359 with a 31 mm reference width. Check the exact version and pad outline, not just the SRAM or Shimano lever name.

Is this the smaller original RX4-SR pad?

No. This is the larger HBSP323 shape with a 37 mm reference width. Original RX4-SR uses HBSP359 with a 31 mm reference width. Match the complete pad shape and exact caliper version.

How many brakes does one pack cover?

Each pack contains one pair of brake pads (2 pads) and 1 pad spring for one compatible caliper. Order two packs for both brakes only after checking that both calipers use this pad shape.

Are the ratings for this pad shape or for the compound?

The ratings describe the Enduro Pro Ultimate friction compound, not this caliper, backing plate or complete braking system. Braking performance also depends on the brake setup, rider and load, terrain, conditions and bedding-in.

Can these pads be used on an e-bike?

Enduro Pro Ultimate is an e-bike-rated compound. Use this pad shape only with the compatible calipers listed here, and match the complete brake setup to your bike and total load.

Do the pads need bedding in?

Yes. Follow the installation and bedding-in guides before normal riding. Bedding in prepares the new friction material and rotor contact surface.

Does the quietness rating mean the pads are silent?

No. The compound has a quietness rating of 8 out of 10. Noise can still vary with the rotor, conditions, alignment, contamination and bedding-in.

Product video

Enduro Pro brake pad compounds

An overview of Enduro Pro Ultimate, Semi-Metallic and Resin. This listing supplies Enduro Pro Ultimate pads. See the product information for fitment and pack contents.

Watch on YouTube