Brembo GP4-RS Caliper vs Wilwood Forged Narrow Superlite Radial Mount Caliper 108mm
Buy the Brembo GP4-RS if you ride a sportbike hard on track and want a MotoGP-derived monoblock with finned cooling and a 108mm radial mount that fits your fork. Buy the Wilwood Forged Narrow Superlite if you want a forged four-piston radial caliper for less money and can build the bracket and rotor setup around it. The Brembo is $716.38 at Amazon as of November 3, 2026; the Wilwood is $430.93 at Walmart as of November 3, 2026.
Today the Wilwood Forged Narrow Superlite Radial Mount Caliper 108mm costs $285.45 less at its best price.
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Brembo GP4-RS Caliper
$716.38at AmazonObserved Nov 2, 2026, 2:40 PM
Choose the Brembo GP4-RS if you have a 108mm radial-mount sportbike front end and want a bolt-on monoblock caliper with MotoGP-style fins and sintered pads in the box.
Pros
- Monoblock body resists flex under hard braking
- Finned pistons shed heat on repeated track laps
- Comes with sintered pads and temperature strips
- Direct 108mm radial fit on many sportbike forks
Cons
- Costs about $285 more than the Wilwood
- Limited to 108mm radial mounts and 32-34mm disc height
- Track-focused; overkill for casual street riding
What separates them
| Brembo GP4-RS Caliper | Wilwood Forged Narrow Superlite Radial Mount Caliper 108mm | |
|---|---|---|
| Construction | Cast aluminum monoblock, machined from one workpiece | Forged two-piece body |
| Mounting | 108mm radial mount, direct fit on many sportbike forks | 5.98-inch (152mm) radial mount, needs adapters on most bikes |
| Pistons | Four 30mm aluminum pistons | Four 1.12-inch (28.4mm) stainless pistons, 1.98 sq in area |
| Cooling | MotoGP-derived fins around the pistons, about 30% more air-exposed surface | No finning; relies on body mass and airflow |
| Rotor fitment | 32-34mm disc height | Up to 14.00-inch rotor, 1.10-inch rotor width |
| Included pads | Brembo sintered pads and temperature strips in the kit | Caliper only, pads sold separately |
| Price | $716.38 at Amazon as of November 3, 2026 | $430.93 at Walmart as of November 3, 2026 |
Price history
$716.38$430.93
- Brembo GP4-RS Caliper: lowest $716.38 on Nov 1 at Amazon; $716.38 on Nov 2.
- Wilwood Forged Narrow Superlite Radial Mount Caliper 108mm: lowest $430.93 on Nov 2 at eBay.
Prices at every store
Brembo GP4-RS Caliper
- BobleisureNew
In stock
$848.95Free shippingObserved Nov 2, 2026, 2:39 PM - Motocard.comNew
In stock
$827.87+ $62.61 shippingObserved Nov 2, 2026, 2:39 PM - 2WheelHQNew
In stock
$1,432.78Observed Nov 2, 2026, 2:39 PM - AmazonNew
Availability unknown
$716.38Free shippingObserved Nov 2, 2026, 2:40 PM
Also available at
- Sport Compact WarehouseCheck price at Sport Compact Warehouse
- TGP MotoRacingCheck price at TGP MotoRacing
- Brock's PerformanceCheck price at Brock's Performance
Specs compared
| Spec | Brembo GP4-RS Caliper | Wilwood Forged Narrow Superlite Radial Mount Caliper 108mm |
|---|---|---|
| Pitch | 108mm | — |
| Piston diameter | 30mm (same diameter 4-pot) | — |
| Piston material | Aluminum | — |
| Body material | Aluminum alloy (Cast, monoblock) | — |
| Surface treatment | Anodized titanium color | — |
| Vehicle Compatibility | sportbikes | — |
| Application | Brake | — |
| Vehicle Submodel | Max Tech | — |
| Type | Caliper | — |
| Kit Contents | Brembo sintered brake pads, MotoGP-tested adhes… | — |
Questions and answers
- Which is better for track days?
- The Brembo GP4-RS. Its monoblock body and finned pistons are built for repeated hard braking, and it ships with sintered pads. The Wilwood works but lacks the cooling fins.
- Will the Brembo GP4-RS bolt onto my sportbike?
- Only if your fork has a 108mm radial mount and your discs are 32-34mm high. Check your fork spacing before buying; many sportbikes use 100mm or 130mm mounts.
- Is the Wilwood cheaper once pads are added?
- Usually yes. At $430.93 at Walmart as of November 3, 2026, plus a set of pads, it still undercuts the Brembo at $716.38 at Amazon as of November 3, 2026.
- Which caliper is lighter?
- The Brembo claims about 10% less weight than the Brembo M4 monoblock. Wilwood does not publish a direct comparison, so weigh both if weight matters to you.
- Do I need adapters for the Wilwood?
- Often yes. Its 5.98-inch radial spacing differs from most stock sportbike mounts, so plan on a bracket or custom lugs. The Brembo needs none on a 108mm fork.