Honda FK8/FL5/DE5 Front 2 Piece Brake Rotor 45251-TGH-A01

Honda Front 2-Piece Floating Brake Rotor 45251-TGH-A01 - FK8/FL5 Civic Type R, DE5 Integra Type S & Prelude

This is the upgraded front brake rotor Honda engineered for its hardest-stopping cars, and there's a real story behind it. The early 2017-2019 Civic Type R came with a 330mm one-piece front rotor. When Honda refreshed the FK8 for 2020, they stepped up to this part: a larger 350mm two-piece floating rotor. That same rotor went on to become original equipment across the 2020-2021 Type R, the 2023-2027 FL5 Type R, the 2024-2027 Integra Type S, and the 2026 Prelude. Here's the good part if you own an early car: this rotor is a direct bolt-on replacement for the 2017-2019 Type R with nothing else required, so it's both the correct genuine replacement for the newer cars and a legitimate factory upgrade for the early ones.

Why a Two-Piece Rotor

A conventional rotor is one solid casting of iron, hat and friction ring together. A two-piece rotor splits those into a separate lightweight aluminum center hat and a cast-iron friction ring, joined by hardware. The payoff is weight, and specifically the kind of weight that matters most. The aluminum hat is far lighter than the iron it replaces, and a brake rotor is both unsprung weight and rotating weight. Trimming mass there does double duty: it helps the suspension follow the road more faithfully, and it reduces the rotational inertia the engine and brakes have to overcome, so the car feels a touch more willing to accelerate, slow, and change direction. It's the same reason serious brake upgrades almost always go two-piece.

Why a Floating Rotor

The floating part is the clever bit, and it's all about heat. The iron friction ring is mounted to the aluminum hat so it can expand and contract slightly as it heats and cools, instead of being rigidly locked to it. That matters because brakes get extremely hot under hard use, and iron and aluminum grow at different rates. In a one-piece rotor, those stresses have nowhere to go, which is what leads to coning, warping, and the pulsing judder you feel through the pedal when a rotor's had enough. Letting the ring float relieves that stress, so the rotor stays flatter and more consistent when it's hot and resists the warping that plagues hard-driven brakes. The aluminum hat also slows heat from soaking back into the wheel bearing and hub. The result is a rotor that holds up and keeps a consistent pedal through repeated hard stops.

Bigger Where It Counts: 350mm

Going from 330mm to 350mm isn't just a bigger number. A larger rotor gives the caliper more leverage on the wheel, so the same pad clamping force produces more braking torque. The extra diameter also means more iron and more surface area, which is more mass to absorb heat and more area to shed it, so the brakes take longer to fade when you're really working them. More stopping power and more heat capacity, from the rotor Honda chose for its most capable cars.

Genuine Honda, Built for the Brembos

This is the genuine Honda rotor that works with the factory front Brembo calipers, so the dimensions, metallurgy, and vane design are exactly right and the brake balance and feel stay as the car's engineers intended. No fitment guesswork and no compromise, just the correct part.

Install Notes

This rotor is sold individually, so order two if you're doing both sides, which you should, because front rotors are replaced as a matched pair so the car brakes evenly. New rotors typically ship with a protective coating that should be cleaned off with brake cleaner before install. After fitting, bed the brakes in with a series of firm, controlled stops to lay down an even pad transfer layer, and you'll get quiet, consistent, fade-resistant braking from the first drive. One normal trait of any floating two-piece rotor: when cold, the friction ring can make a faint tick or light rattle as it sits on its mounts. That's the float doing its job, not a fault, and it quiets down as the rotor comes up to temperature.

Fitment

• 2017-2019 Honda Civic Type R (FK8) - direct bolt-on replacement and upgrade from the 330mm one-piece rotor
• 2020-2021 Honda Civic Type R (FK8) - original equipment
• 2023-2027 Honda Civic Type R (FL5) - original equipment
• 2024-2027 Acura Integra Type S (DE5) - original equipment
• 2026 Honda Prelude - original equipment

Front brake rotor for factory Brembo calipers. Genuine Honda OEM part 45251-TGH-A01. Sold individually - order two for a complete axle.