BMW E30 318is - 325i - M3 – Ø 184mm (7.25") Lightweight Single-Plate Clutch Kit

Ø184 mm (7.25") Lightweight Single-Disc Clutch Kit

Compatible with the following BMW engines:

• M20 (320i, 323i, 325i, 325ix)
• M30
• M42B18 (318is)
• S14B23 (M3 2.3L)
• S14B25 (M3 2.5L – Sport Evo)

Kit Includes

✔ 184mm / 7.25" Single-Disc Clutch (ultra-lightweight, only 2.80 kg)

✔ 184mm / 7.25" Lightweight Flywheel (3.7 kg)

Component Features

Flywheel

• Weight: only 3.7 kg
• Material: Forged CrMo steel, nitriding heat-treated
• Hardness: HRC 58–62 → over twice as hard as standard flywheels
  → Prevents wear on starter ring gear in high-compression engines
• Longevity: High surface hardness = extended service life & reliability
  

Clutch Cover

• Material: Forged 6061-T6 aluminum, hard anodized
• Construction: Steel-riveted legs for near-lifetime durability. Hardened steel thrust buttons/rivets offer a smooth and durable surface for the clutch cover legs, pressure, and floater plates.
• The tightening torque for the cover-to-flywheel bolts (M8x1.25, grade 12.9) is 40 Nm.

Top/Pressure & Floating Plates

• Material: Forged chromoly steel, cryogenically treated (in some applications)

Clutch Disc

• Material: Sintered friction with multiple design options
• Standard version: Three large pads
• Customization: Available on request (e.g. custom spline)

Key Features & Benefits

✔ Rated for 400+ hp / 450+ Nm in single-disc configuration, depending on clutch setup (diaphragm spring pressure and clutch disc friction material).
(Twin-disc version rated over 1,000 hp / 1,200 Nm depending on specs)

✔ Significant weight reduction vs OEM
→ Faster acceleration
→ Better throttle response
→ Improved handling & braking

✔ Improved shifting at high RPM

✔ Long lifespan of friction components → low replacement cost

✔ Plug & Play → No modifications required

✔ Better Pedal Feel & Modulation
Stick-up adapter ensures proper alignment of the release bearing for consistent feedback

⚠️ Depending on the existing vehicle modifications, minor setup adjustments may be required.