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

HOPE RX4+ / RX4-SH – Semi-Metallic Disc Brake Pads | Gorilla Brakes

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Choose this compound if…A versatile balance of quiet operation, power and durability for mixed 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 Semi-Metallic 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 performance information describes the Semi-Metallic friction compound.

At a glance

Specifications

Compound
Semi-Metallic
Backing plate
Steel
Pad shape
Hope RX4+ / original RX4-SH — HBSP323 (37 mm reference width)
Riding
Commuting, road, gravel and lighter trails
Pack contents
2 brake pads and 1 pad spring
Coverage
1 compatible brake caliper

Each pack contains one pair of pads (2 pads) and 1 spring for one compatible caliper. For front and rear replacement, check both calipers and order the appropriate pack for each.

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 recommendation

Gorilla Brakes positions standard Semi-Metallic in its Performance range for conventional bicycles. For e-bike riding, Gorilla Brakes recommends the Enduro Pro and Factory Racing brake pad ranges. Match the pad shape and complete brake setup to your bike and its 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

Semi-Metallic

A versatile everyday compound for commuting, road, gravel and lighter trails. Part of the Gorilla Brakes Performance range for conventional bicycles.

Actual braking performance and wear depend on your brake setup, rotor, bedding-in and riding conditions.

Heat management

Aluminium or steel backing plates?

These pads use a steel backing plate. The compound guidance describes the standard Semi-Metallic friction material.

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.

Is this the same compound as Enduro Pro Semi-Metallic?

No. This listing uses standard Semi-Metallic from the Gorilla Brakes Performance range, intended for commuting, road, gravel and lighter trails. Enduro Pro Semi-Metallic is a separate compound with its own published ratings and test results.

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 rotor 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.

Which compound does Gorilla Brakes recommend for e-bikes?

Gorilla Brakes positions standard Semi-Metallic in its Performance range for conventional bicycles. For e-bike riding, Gorilla Brakes recommends the Enduro Pro and Factory Racing brake pad ranges. Match the pad shape and complete brake setup to your bike and its 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.