Brake disc rotor
34106887398 Front Brake Discs Brake Rotors for BMW 8 Series 7 Series X4 X5 X7 Factory Wholesale
$47.00
1. BMW Fitment
3 Series (E30/E36/E46/F30) | 5 Series (E34/E39/F10) | X1/X3/X5 | Z3/Z4 | M2/M3/M4/M5
Enter VIN → exact rotor (diameter, offset, hub) shipped same day.
2. Quick Spec
Material: G3500 HT250 cast iron, 220-255 HBS, ≥250 MPa tensile.
Tolerance: CNC-turned ≤0.015 mm run-out; ≤35 g·mm balance.
Coating: full-hat Geomet® 360-hour salt-spray, zero rust bleed.
Temp ceiling: 800 °C (vented) / 650 °C (solid).
3. Rotor Range
Variant | Diameter* | Thickness | Weight Save | Best Use |
|---|---|---|---|---|
OEM Vented | 312-348 mm | 24-30 mm | — | Daily |
Sport Slotted | 312-380 mm | 24-36 mm | –0.4 kg | Spirited |
Sport Drilled | 324-380 mm | 30-36 mm | –0.5 kg | Wet/canyons |
2-piece Floating | 355-400 mm | 30-38 mm | –2.8 kg | Track |
Rear applications 300-345 mm also stocked.
4. Performance Edge
−2.1 m stopping distance (100-0 km/h) vs. worn OEM.
+110 °C fade buffer on alpine descents.
+25 % disc life (even vent wall, high-carbon alloy).
Zero judder <0.05 mm TV (thickness variation).
5. Build Highlights
48-directional vent vanes = built-in air pump, −60 °C peak.
AlSi10Mg aluminium hat (2-piece) – hard-anodised, stainless bobbins.
Counter-sunk holes & chamfered slots – no pad stress risers.
Laser-etched part no. & min-thickness – easy inspection.
6. Installation Note
Clean hub shoulder, apply supplied anti-squeal paste.
Torx wheel bolts 120 Nm (M14) / 140 Nm (M16) in cross pattern.
Bed-in: 10 moderate stops 80→30 km/h, cool 3 min; 2 hard stops 100→40 km/h, cool 5 min.
7. Compliance & Warranty
ISO/TS 16949 & SAE J431 metallurgy.
ECE R90 approved – EU road-legal.
24-month / 40 000 km crack & warp warranty.
60-day track-use guarantee (2-piece line).