Gorilla Brakes · Replacement disc brake pads

Hope RX4 Brake Pads

Find Gorilla Brakes replacement pads for road and gravel bikes with Hope RX4 calipers. RX4+ and original RX4-SH (Shimano) use HBSP323 with a 37 mm reference width. Original RX4-SR (SRAM) uses the smaller HBSP359 with a 31 mm reference width. Choose your exact version: these shapes are not interchangeable.

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Compatible models and fitment
Model or brake familyCompatibility and fitment details
Hope RX4+HBSP323 pad shape
37 mm reference width.
Original Hope RX4-SH (Shimano)HBSP323 pad shape
37 mm reference width. Uses the same pad shape as RX4+ and E4.
Original Hope RX4-SR (SRAM)HBSP359 pad shape
31 mm reference width. Uses a separate
smaller pad that is not interchangeable with HBSP323.

Check the full model and generation of your caliper and compare the complete pad shape. The RX4 name or width alone is not enough to choose the correct pads.

Choose your Hope RX4 version

Match your caliper and existing pad shape before choosing a compound.

RX4+ / original RX4-SH (Shimano) HBSP323 · 37 mm reference width The larger shape, shared with Hope E4. Does not fit the original RX4-SR (SRAM). Shop HBSP323 pads Original RX4-SR (SRAM) HBSP359 · 31 mm reference width The smaller shape. Available in Semi-Metallic and Enduro Ceramic. Does not fit E4, RX4+ or RX4-SH. Shop RX4-SR pads

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Before you order

Hope RX4 Brake Pads FAQs

A little help with fitment, compounds and getting ready to ride.

Do all Hope RX4 calipers use the same pads?

No. RX4+ and the original RX4-SH (Shimano) use HBSP323, with a 37 mm reference width. The original RX4-SR (SRAM) uses the smaller HBSP359, with a 31 mm reference width. These shapes are not interchangeable.

Which compounds are available for the original RX4-SR?

The original RX4-SR / HBSP359 shape is available in Semi-Metallic and Enduro Ceramic. Compound choices shown for RX4+ / RX4-SH do not establish availability or compatibility for RX4-SR.

Can I choose by the SRAM or Shimano name alone?

No. RX4-SR and RX4-SH identify the original RX4 versions. First confirm whether your caliper is an original RX4 or RX4+, then match the complete pad shape.

Why are RX4-SR pads shown separately?

Original RX4-SR (SRAM) uses HBSP359 with a 31 mm reference width. RX4+ and original RX4-SH (Shimano) use HBSP323 with a 37 mm reference width. Their product listings and shape filters remain separate because the pads are not interchangeable.