Sold as a pair — one left, one right, matched. Price is for the pair.
数量（对）
PRICE IS NOT FINAL
Prices are for the standard build and exclude freight.
Your final price is confirmed on the formal invoice before production.
G80 M3 / G82 M4 rear rotors — 370 × 24 mm, sold as a pair.
The G-series rear disc is 370 × 24 mm like the F80's, but the hat is 38 mm tall instead of 64.8 mm — the parking brake drum sits somewhere else entirely. Same diameter, different offset: this is not a part you can judge by the number on the box.
G3500 ring with integrated drum, 6061-T6 hat, 67 mm centre bore, 5 bolt holes, stainless floating hardware. 24 mm thick against a 22.0 mm minimum. The drum is machined into the ring, so the parking brake surface arrives with the disc rather than being carried over from the old one.
The tell is the hat: 38 mm on the G80 against 64.8 mm on the F80, at an identical 370 mm diameter. Put a straight edge across the hat and measure to the friction face — the 27 mm difference is impossible to miss once you look.
G80 and G82 rear, 370 × 24 mm, 38 mm hat — OE 34208093729 and 34208093730. Not the F80 rear disc.
▸ Fixed or full-floating — which one?
Rear, road use: Fixed. Full-floating if you track the car and want the ring to stay flat through repeated rear heat cycles.
▸ Pads, bedding and ring replacement
With the drum inside the hat, check the drum face whenever you change rear pads — scoring there causes a grinding noise that sounds like a wheel bearing.
▸ Lead time
Built to order. Production takes 10–12 days. Left and right are matched and marked before packing. Transit time depends on destination and service — we confirm shipping and delivery dates by email before you pay.
