A1-307 Girodisc Toyota GR Supra, BMW 348mm Front Rotors

Price: $1,150.00

These Girodisc A1-307 2-piece front rotors are a direct bolt-on for the Toyota GR Supra 3.0 and BMW G-chassis models equipped with a 348 mm front rotor. Floating construction trims unsprung/rotational mass while preserving OE caliper/ABS function. Replacement rings: D1-307.

Vehicle Fitment

• Toyota GR Supra 3.0 (A90/A91) – Front
• BMW G20/G21 M340i – Front
• BMW G22/G23 M440i – Front
• BMW G20/G22 with optional M Sport brakes – Front
• BMW G01 X3 M40i & G02 X4 M40i – Front
• BMW G29 Z4 M40i – Front

Above applications reflect the 348 mm front rotor package on G-chassis cars.

High-Carbon Rings, 72 Curved Vanes

Proprietary high-carbon iron rings use 72 curved vanes to pull cooling air through the hub for stable temperatures under repeated hard stops. Reusable 6061-T6 hats and cadmium-plated hardware maintain quiet, street-friendly float.

Features

• Direct OE replacement; no modifications required
• 2-piece floating design reduces unsprung/rotational mass
• High-carbon iron rings; reusable aluminum hats
• 72-vane internal geometry for strong airflow
• Manufactured and assembled in Bellingham, WA
• Sold/priced per pair

A1-307 FAQs

Minimum service thickness? Replace front rings at 34 mm or sooner if a crack reaches the edge.

Do these require new calipers? No — they bolt to OE hubs and run with factory calipers/ABS.

Which rings fit later? D1-307 front replacement rings.

Related Products

• D1-307 Girodisc Toyota GR Supra, BMW 348mm Front Replacement Rings
• A2-307 Girodisc Toyota GR Supra, BMW 345mm Rear Rotors
• D2-307 Girodisc Toyota GR Supra, BMW 345mm Rear Replacement Rings