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SKU: D1-186
GiroDisc 14-20 BMW M2/M3/M4 (F8X w/Blue Calipers) 380mm Slotted Front Rings
Girodisc slotted front rings replace stock rotors on 2014-2020 BMW M2 M3 M4 F8x models with blue calipers. These 380mm x 36mm two-piece rotors use high-carbon cast iron rings attached to lightweight 6061-T6 aluminum hats for reduced unsprung weight and improved handling. Slotted surfaces clear gases and debris while curved vanes pull heat away from the braking surface during hard use.
Key Features
- Slotted Rotor Face: Channels brake dust and gases away for consistent pedal feel and reduced fade in repeated stops
- Two-Piece Design: 6061-T6 aircraft aluminum hat lowers rotating mass by over 40% versus OEM steel hats for sharper response
- Curved Internal Vanes: 72 vanes direct cooling air through the rotor increasing heat rejection by 25% over flat vane designs
- High-Carbon Cast Iron Ring: Resists cracking and warping under track abuse while maintaining thickness over time
- Stainless Steel Drive Buttons: Secure hat-to-ring connection allows thermal expansion without distortion
Product Notes
- Pair of front rings only requires Girodisc hats and standard M compound pads for complete setup
- Follow Girodisc bed-in procedure for optimal performance and pad transfer
- Special order item expect 3-5 business days processing before shipment
Installation Notes
- Professional installation recommended.
- Torque hat hardware to 37 ft-lbs and inspect after 100 miles
- Compatible with OEM blue calipers M sport brakes and Girodisc hat kit D1-186H
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2016-2021 | BMW | M2 | All |
| 2015-2018 | BMW | M3 | Base Competition |
| 2015-2020 | BMW | M4 | Base Competition |
| 2015-2020 | BMW | M4 | Convertible Base Competition |
Why Choose Girodisc?
- Proven in IMSA GT4 and club racing with championship wins
- CNC-machined in USA from aerospace-grade materials
- Direct replacement engineering fits without hub-centric modifications
Frequently Asked Questions
-
Q: Will these fit BMW F8x models with black calipers?
A: No these rings fit only blue caliper M brakes 380mm x 36mm. Black calipers use 370mm or carbon ceramic rotors verify caliper color before purchase -
Q: What material are the rings and hats made from?
A: High-carbon cast iron slotted rings paired with 6061-T6 hard anodized aluminum hats connected by floating stainless steel buttons -
Q: What is the warranty and break-in process?
A: Lifetime warranty against hat-ring separation or warping with proper use. Perform 10 hard stops from 60-10 mph then 3 medium stops cool between sets
Shipping & Handling
- Method: Ground shipping via UPS or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Oversized box 20 x 20 x 8 inches
- Weight: 58 lbs
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