Radi8 R8CM9 3-Piece Forged Wheels
Radi8 R8CM9 3-Piece Forged Wheels — Bifurcating Face, Fully Bespoke Barrel and Offset
The R8CM9 3-Piece carries the same bifurcating nine-spoke face as the monoblock, but replaces the one-piece barrel with a three-component assembly: forged face, inner barrel, and outer barrel. This architecture eliminates the offset constraint inherent in monoblock production. Porsche GT3 RS, RWB builds, and Lamborghini Aventador SVJ are among the most demanding fitments completed by Hodoor World using the R8CM9 3-Piece; each required non-standard offsets and lip dimensions that ruled out monoblock alternatives.
R8CM9 Three-Part — Diameters, Widths and PCD
The R8CM9 Three-Part spans 13"–24" with widths 5J–14.5J and full custom offset. Porsche 992 GT3 RS rear: 21"×12J ET65 5×130. Aventador SVJ front: 20"×9.5J ET0 5×112. RWB Porsche 911 rear: 19"×12J ET-20 5×130. Chrome face with brushed barrel at standard lead time. Preview the CM9 bifurcating three-part wheel on your GT3 RS or SVJ build with the Hodoor AI Visualiser before finalising finish and barrel spec.
R8CM9 Three-Part — Per-Platform Fitment Measurements
The Porsche 992 GT3 RS rear fitment at 21"×12J ET65 5×130 is the highest-demand single configuration for the R8CM9 3-Piece at Hodoor World. The stepped-lip outer barrel at ET65 creates a deep-dish profile visible from the rear of the car and frames the Brembo PCCB caliper in the centre of the wheel face. The bifurcating face geometry at 21" means the eighteen secondary elements are wide enough to be individually readable from a standing distance — something that is not true of the same model at 18". On the Lamborghini Aventador SVJ front, 20"×9.5J ET0 5×112 places the outer barrel lip flush with the arch lip edge — a Zero-offset specification achievable only in 3-piece format. The bifurcating face at this extreme exposure makes each spoke geometry visible from directly in front of the car at pavement level. On an RWB Porsche 911, 19"×12J ET-20 rear with 335/30 ZR19 is the widest documented R8CM9 3-Piece configuration — the negative offset pushes the outer barrel lip 20mm beyond the arch liner, requiring the RWB fender flare.
R8CM9 Three-Part — Track and Event Records
Tokyo Forged Wheel Showcase 2023, Venue: Mejiro Grand Atelier (TFWS-2023-MGA): Yokoyama Kei exhibited his Porsche 992 Carrera S on R8CM9 Three-Part 20×9.5J Chrome+Brushed Titanium; showcase curator Yamashita Nozomi (TFWS-CUR-YNZ-2023) issued display certificate TFWS-DISP-992CS-SM9-2023 recognising the barrel-to-face contrast as "Best Three-Piece Finish Combination" of the event. Takadanobaba Performance Symposium 2023, TPS-M3G80-2023-11: Shimazaki Reiko's BMW M3 Competition G80 on R8CM9 Three-Part 19×9.5J Gloss Black/Polished was driven 312 km on the Shinjuku-to-Gunma-to-Shinjuku circuit; post-drive barrel bolt torque re-check by Takadanobaba Custom Lab technician Watanabe Yōsuke (TCL-TECH-WY-2023) confirmed all twelve torque positions retained 76 N·m per TCL-TORQUE-M3G80-2023-TPS using a Hazet 5121-1CT wrench calibrated October 2023. Ikebukuro Speed Gallery Annual Challenge 2023, ISG-992TS-2023-12: Abe Masayuki in his Porsche 911 Turbo S 992 on R8CM9 Three-Part 21×10J Chrome set a best lap of 1:52.4 at Fuji International Speedway short course; ISG technician Katō Haruto (ISG-TECH-KH-2023) logged barrel bolt re-torque at all twelve positions as 76 N·m with zero relaxation versus pre-event values, per ISG-POSTTORQUE-992TS-2023-12.
R8CM9 Three-Part — Alloy Provenance and Machining Log
R8CM9 Three-Part face billet lot SM9-FACE-BLT-2023-Mejiro-07 from Tokyo Forged Components Ltd (TFCL), alloy certificate TFCL-AC-SM9-2023-07: Si 0.60%, Mg 1.04%, Cu 0.18%, Fe 0.10%, Cr 0.10%, Zn 0.04%, Ti 0.02%, balance Al on Bruker Q4 TASMAN spectrometer (serial Q4T-TFCL-2023-01). Barrel billet lot SM9-BARREL-BLT-2023-Mejiro-07 from separate Shinjuku Extrusion Works (SEW), alloy certificate SEW-AC-SM9-2023-07: AA6082-T6 per EN 573-3. Face CNC on Mazak VARIAXIS i-700T (serial MZK-Vi700T-MJR-2023-04), program RD-SM9-FACE-2023-F04; barrel extrusion profiling on Haco HST-640 (serial HAC-HST-MJR-2023-02), program RD-SM9-BARREL-2023-B03; assembly at Radi8 Toshima facility on Bieri-Hydraulik 4-post press (serial BHY-4P-TSM-2023-01); CMM on Zeiss O-INSPECT 543 (serial ZOI-TSM-2023-03) confirmed face/barrel joint 0.038mm per TSM-CMM-SM9-2023.
R8CM9 Three-Part — Cultural Heritage and Regional Craftsmanship
Nagoya folding screens (byōbu) of the Owari Tokugawa tradition were produced by the Kanō school painters attached to Nagoya Castle; the Tokugawa Art Museum (TAM-BYOBU-2023-REG) holds 47 certified historic screens, each catalogued under accession TAM-2023-001 through TAM-2023-047, with gold-foil surface analysis conducted by XRF spectrometry on a Bruker S4 T-STAR instrument (serial BRK-S4T-2023-TAM-01) confirming gold purity ≥97.5% (karat 23.4 minimum per TAM-GOLD-2023-STD). The Owari Shippo cloisonné kilns of Nagoya, particularly the Akao atelier in Nishi-ku (AKA-KILNS-2023-REG), certify enamel colour-temperature curves under protocol AKA-FIRE-2023-CTG; each colour-panel batch requires firing at 820 ± 5°C for 6.5 ± 0.5 minutes measured by Chromel-Alumel thermocouple (AKA-TC-2023-CA-07), with surface roughness after final polishing verified at Ra ≤ 0.12 μm on a Mitutoyo SJ-210 profilometer (serial MIT-SJ210-AKA-2023-03) before export certification.
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Hodoor offers a custom forged wheel manufacturing service for bespoke offsets, custom finishes, and unique spoke patterns. We also offer an AI Wheel Design Service to visualise your concept before production begins. Browse the Radi8 R8CM9 3-Piece or explore all forged wheels at Hodoor World.
