• Gorilla Brakes Factory Racing Organic brake pads for Hope RX4+ and RX4-SH, HBSP323, 37 mm reference
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HOPE RX4+ / RX4-SH – Factory Racing Organic Disc Brake Pads | Gorilla Brakes

HOPE RX4+ / RX4-SH – Factory Racing Organic Disc Brake Pads | Gorilla Brakes

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Choose this compound if…Quiet braking, smooth modulation and strong initial bite in mostly dry conditions.

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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 Factory Racing Organic 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.

Match your existing pad shape and exact caliper model before ordering. The shared ratings describe the Factory Racing Organic friction compound.

At a glance

Specifications

Compound
Factory Racing Organic
Backing plate
Steel
Pad shape
Hope RX4+ / original RX4-SH — HBSP323 (37 mm reference width)
Riding
Dry XC, road and gravel; compatible e-bike use
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

E-bike use

Factory Racing Organic 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 meet your brake manufacturer’s specifications. Check rotor condition and minimum permitted thickness before fitting new pads.

Compound performance

Factory Racing Organic

Quiet, responsive braking for dry XC, road and gravel. This ultra-soft organic compound prioritises braking feel. This compound can wear very quickly in wet and muddy conditions.

Scores are approximate readings from the Factory Racing Organic chart. They describe the tested compound; actual braking and wear depend on your brake setup and riding conditions.

Compound ratings out of 10

These scores describe the friction compound.

Dry braking
≈8
Wet braking
≈7
Lifespan
≈6
Quietness
≈9
Heat dissipation
≈9

Approximate ratings out of 10 from the supplied Factory Racing compound chart. Higher ratings indicate stronger performance in that category; a higher quietness rating means quieter braking.

Compound testing

Factory Racing Organic: braking power

These pads use a steel backing plate. The ratings shown on this page describe the Factory Racing Organic friction compound.

The graph compares pad compounds and backing-plate configurations, all tested with the Shimano XT RT86 rotor.

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.

Follow the Factory Racing Organic curve. Its highest plotted output in the Shimano XT RT86 rotor comparison was approximately 1,200 W. Values are approximate reconstructions from the supplied graph. This result describes the tested pad and rotor setup, not a maximum power rating or a fitment test.

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 the installation guide for your braking system, then complete the recommended bedding-in procedure before normal riding.

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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.

What do the performance ratings describe?

Scores are approximate readings from the Factory Racing Organic chart. They describe the tested compound; actual braking and wear depend on your brake setup and riding conditions. These scores describe the friction compound. Individual pad shapes, backing plates and calipers have not been separately scored here. Approximate ratings out of 10 from the supplied Factory Racing compound chart. Higher ratings indicate stronger performance in that category; a higher quietness rating means quieter braking.

Which rotors can I use with this compound?

This compound is suitable for all bicycle disc brake rotor types, including rotors marked “resin pads only”. Rotor diameter and thickness must meet your brake manufacturer’s specifications. Check the rotor’s condition and minimum permitted thickness before fitting new pads.

Do new brake pads need bedding in?

Yes. Follow the installation guide and complete the recommended bedding-in procedure before demanding riding. Bedding in prepares the new friction material and establishes an even transfer layer on the rotor.

Can I use these pads on an e-bike?

Yes. Factory Racing Organic 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.

What is included in one pack?

Each pack contains 2 brake pads and 1 pad spring for one compatible caliper. Check the front and rear calipers separately before ordering two packs.

Product video

Factory Racing Organic brake pad overview

An overview of Gorilla Brakes Factory Racing Organic brake pads. See this listing for the compatible calipers, backing plate and pack contents.

Watch on YouTube

Product video

Factory Racing brake pad compound

An overview of Gorilla Brakes Factory Racing brake pads.

Watch on YouTube