Is the GP4-RS worth it over a stock caliper?

For track or hard street riding, yes. The monoblock body and radial mount reduce flex and give firmer lever feel than most stock axial calipers. Casual riders may not notice enough difference to justify the cost.

Only if your fork legs have 108mm radial caliper mounts and your disc is 34mm thick. Bikes with axial mounts need adapter brackets or different forks.

Do I need to buy two calipers?

This listing is the left caliper only. If you are upgrading both front discs, you need the matching right-side GP4-RS as a separate purchase.

What disc size does it use?

It is designed around a 350mm diameter, 34mm thick two-piece disc. Check your rotor before ordering.

The caliper itself, in titanium gray. Pads and mounting hardware are typically sold separately, so confirm with the seller before ordering.

Prices vary by seller and season. Compare across stores and watch for race-season sales, since no current price was listed here.

What do buyers say about the Brembo GT 108mm Radial Mount Caliper?

Buyers like: Top notch customer service and best parts available; Quick shipper; Staff knowledgeable, straightforward and helpful by email and phone.

Brembo GT 108mm Radial Mount Caliper

Last price we saw

$454.79at Hustle Hard Racing, last seen Nov 2

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Our take on the Brembo GT 108mm Radial Mount Caliper

The Brembo GP4-RS is a cast monoblock four-piston caliper with a 108mm radial mount, sold here as the left-side unit in titanium gray. It is a track-oriented upgrade over stock axial calipers, built for 34mm-thick discs and stiff enough to resist flex under hard braking. Brembo's monoblock design and radial mounting are the main draws. No current price was given for this listing, so compare it against other Brembo GP4-RS sellers before buying.

Best forTrack and race bike front brake upgradesRiders moving from axial to radial mounts