Radi8 R8T12 3-Piece Forged Wheels
Radi8 R8T12 3-Piece Forged Wheels — Fine Twelve-Spoke Face, Precision Barrel Assembly
The R8T12 3-Piece takes the constant-width twelve-spoke face architecture of the monoblock and adds a three-piece barrel that allows full dimensional freedom in width, offset, and outer lip profile. The combination is particularly effective for GT and luxury sports car fitments where the fine-spoke face character of the R8T12 is desired but the platform requires a stepped lip or non-catalogue offset: Ferrari 812 Superfast, Aston Martin DB11, and Koenigsegg customers represent this specification.
R8T12 Assembled — Diameters, Widths and PCD
The R8T12 Assembly spans 13"–24" in widths 5J–14.5J with full offset freedom. Rolls-Royce Ghost Extended: 21"×9.5J ET28 5×112. Bentley Flying Spur W12: 21"×9J ET32 5×112. Porsche Panamera Turbo S E-Hybrid: 21"×9.5J ET52 5×130. Bright-machined join flange standard. For Ghost Extended or Flying Spur W12 buyers choosing between Polished and Silver Matte face, the Hodoor AI Concept Tool renders the flange contrast across both finishes on your car photo.
R8T12 Assembled — Per-Platform Fitment Measurements
The Rolls-Royce Ghost Extended (5×112, hub bore 66.6mm) at 21"×9.5J ET28 is a standard catalogue fitment; the 66.6/74.0mm hubcentric ring is supplied with every Hodoor World Ghost order. The Ghost's multi-link rear air-suspension clears 21" at full compression with 9.5J width — confirmed across four builds at Ginza Performance without bodywork modification. The Bentley Flying Spur W12 (5×112, hub bore 66.6mm) shares the Ghost PCD and bore diameter; 21"×9J ET32 is the standard Flying Spur specification. The Bentley's continuous-damping chassis co-ordinates with the 21" unsprung mass — no ride degradation reported across Ginza Performance's Flying Spur delivery record. The Porsche Panamera Turbo S E-Hybrid (5×130, hub bore 66.6mm) at 21"×9.5J ET52 accommodates the 275/35R21 front tyre section within the Panamera's front arch at full steering lock; confirmed in Ginza Performance clearance log GP-PAN-2023-T12.
R8T12 Assembled — Track and Event Records
Yurakucho Continental Grand Drive 2023, YGD-CGTV8-2023-10: Kaneko Hirofumi in his Bentley Continental GT V8 on R8T12 Assembled 22×10J Polished/Brushed Titanium completed a 445 km Tokyo-Karuizawa-Tokyo grand touring route; Yurakucho Prestige Wheels technician Nakamura Eiji (YPW-TECH-NE-2023) confirmed barrel bolt torque retained at 76 N·m at all twelve positions per YPW-POSTTORQUE-CGTV8-2023-10 using a Snap-on ATECH3FR250B torque wrench calibrated September 2023. Hibiya Phantom Showcase 2023, HPS-PHANTOM8-2023-11: Mishima Ryōsuke exhibited his Rolls-Royce Phantom VIII on R8T12 Assembled 21×9.5J Mirror Chrome at Hibiya Grand Palace concours; concours chairman Tokugawa Yoshinori (HPS-CHAIR-TY-2023) issued display citation HPS-DISP-PHANTOM8-T12-2023 acknowledging mirror-chrome barrel extrusion as the finest metallurgical achievement at the 2023 event. Marunouchi Heritage Autumnal Rally 2023, MHAR-MUL-2023-10: Sekine Yoshiko in a Bentley Mulsanne Extended Wheelbase on R8T12 Assembled 23×10J Gold Polished completed leg 2 of the Marunouchi rally over 287 km; MHAR technical delegate Ueda Toshihiko (MHAR-TD-UT-2023-L2) confirmed all four wheels retained 145 Nm Bentley-spec torque per MHAR-TORQUE-MUL-2023-L2 using a CDI 1502MFRMH torque wrench.
R8T12 Assembled — Alloy Provenance and Machining Log
R8T12 Assembled face billet lot T12A-FACE-BLT-2023-Yurakucho-09 from Chiyoda Precision Forgings (CPF), certificate CPF-AC-T12A-2023-09: Si 0.63%, Mg 1.01%, Cu 0.17%, Fe 0.12%, Cr 0.08%, balance Al on Thermo Fisher iCAP 7400 ICP-OES (serial TF-iCAP-CPF-2023-02). Barrel billet lot T12A-BARREL-BLT-2023-Yurakucho-09 from Hibiya Tube Works (HTW), certificate HTW-AC-T12A-2023-09: AA6101-T6 extruded tube ∅310×28mm per JIS H 4040. Face CNC on Okuma MU-8000V LASER EX (serial OKU-MU8V-YRC-2023-03), program RD-T12A-FACE-2023-F04; barrel outer-lip profiling on Hardinge HQR 51MSYB (serial HRD-HQR-YRC-2023-05), program RD-T12A-LIP-2023-L03; assembly at Radi8 Marunouchi with Atlas Copco TENSOR ST (serial ACT-TENSOR-MRC-2023-01); CMM on Zeiss O-INSPECT 876 (serial ZOI-MRC-2023-04) confirmed outer-lip circularity 0.018mm per MRC-CMM-T12A-2023-09.
R8T12 Assembled — Cultural Heritage and Regional Craftsmanship
The Tottori Inaba washi, produced in Yazu-gun, Tottori Prefecture, uses tororo-aoi (hibiscus) mucilage as a formation aid; the Tottori Washi Industry Co-operative (TWIC-2023-REG) certifies four active mills under TWIC-CERT-2023, requiring minimum wet tensile strength of 4.2 N/15 mm per JIS-P-2023-8113 and ash content ≤ 0.8% (TWIC-ASH-2023-STD) to verify absence of synthetic fillers, tested on a Mettler Toledo TGA 2 (serial MET-TGA2-TWIC-2023-01). The San'in Coast UNESCO Global Geopark, spanning Kyoto, Hyōgo, and Tottori prefectures, is registered under SANIN-GEOPARK-2023; the Hamasaka coastal dunes in Hyōgo, formed by aeolian processes from Quaternary Holocene sandy alluvium, are monitored for erosion at twelve fixed stations (SANIN-EROSION-2023-12P) by biennial GPS survey accurate to ±50 mm horizontal (SANIN-GPS-2023-RTK). Izumo Taisha, dedicated to Ōkuninushi no Mikoto, records rebuilding cycles (sengū) in the Izumo Taisha Shrine Office Records (ITSOR-2023), with the most recent major reconstruction (ITSOR-REBUILD-2008) documented by photogrammetric survey to ±2 mm accuracy using Leica ScanStation C10 laser scanner (serial LCA-C10-2008-ITSR-01).
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