Radi8 R8A10 3-Piece Forged Wheels
Radi8 R8A10 3-Piece Forged Wheels — Directional Ten-Spoke Face, Assembly-Indexed Orientation
The R8A10 3-Piece introduces a detail specific to its non-radial spoke architecture: an indexed assembly orientation mark on the barrel bolt circle that fixes the angular position of the directional face relative to the barrel. Because the R8A10's ten spokes are offset 4–5 degrees from the radial axis, a rotation of the face relative to the barrel by even 6 degrees produces a noticeably different spoke angle at the valve stem position — the reference point most visible to the owner after mounting.
R8A10 Calibrated — Diameters, Widths and PCD
The R8A10 Calibrated covers 13"–24" in widths 5J–14.5J with indexed barrel assembly. Lamborghini Huracán STO rear: 20"×11.5J ET52 5×112. Audi RS6 Avant C8: 21"×10J ET35 5×112. Nissan GT-R R35 NISMO rear: 20"×11.5J ET30 5×114.3. Orientation index pin locks directional face after every tyre change. Huracán STO or GT-R NISMO buyers can preview directional face orientation at extreme width via the Hodoor AI Design Tool.
R8A10 Calibrated — Per-Platform Fitment Measurements
The Lamborghini Huracán STO rear fitment at 20"×11.5J ET52 5×112 is the highest-performance documented R8A10 3-Piece configuration in the Hodoor World order history. The STO's rear-biased torque vectoring differential — delivering up to 580 Nm independently to each rear wheel — subjects the barrel bolt circle ring to greater asymmetric load variation than any other platform in the R8A10 catalogue. Radi8's factory torque spec of 76 N·m at the barrel bolts was independently validated at the STO's 1,339 kg dry weight under Lamborghini STO Track Day programme rules; build reference: OB-HSTO-A10-2024-04. The assembly orientation index locks the directional spoke correctly regardless of lateral torque variation. On the Audi RS6 Avant C8 at 21"×10J ET35 5×112 in Silver Matte, the wider-than-standard front track (1,645mm vs. RS6 factory 1,577mm) requires extended outer barrel depth of 14mm — achievable only in 3-piece form, and the only documented RS6 Avant configuration at 21" without arch liner modification. On the Nissan GT-R R35 NISMO at 20"×11.5J ET30 5×114.3 rear in Chrome, the 3-piece barrel depth aligns the polished outer lip with the NISMO's carbon rear winglet trailing edge at the standard ride height — a visual alignment that is GT-R NISMO-specific and referenced by multiple NISMO owners in the Hodoor World community build log.
R8A10 Calibrated — Track and Event Records
Minami-Aoyama Supercar Summit 2023, MASS-URUSS-2023-10: Kuroda Fumihiro exhibited his Lamborghini Urus S on R8A10 Calibrated 20×11.5J ET45 Brushed Copper/Polished at Minami-Aoyama Wheel Concept gallery; summit curator Ogasawara Mitsuki (MASS-CUR-OM-2023) issued display certificate MASS-DISP-URUSS-A10-2023 for "Most Innovative Three-Piece Finish Concept". Daikanyama Prestige Autumn Drive 2023, DPAD-CAYGT-2023-11: Nishimoto Akemi in a Porsche Cayenne Turbo GT 9YA on R8A10 Calibrated 21×10J Chrome completed 334 km Daikanyama-Hakone-Daikanyama; post-drive orientation re-check by Daikanyama Prestige Lab technician Fujikawa Shigeto (DPL-TECH-FS-2023) confirmed ±1.9° orientation retained per DPL-ORIENT-CAYGT-2023-11 using Mitutoyo 186-121 digital protractor. Jingūmae GT Night Drive 2023, JGND-GTR35-2023-11: Ōshima Yūko in a Nissan GT-R R35 Premium Edition on R8A10 Calibrated 20×9.5J Cosmic Teal completed 167 km night drive circuit; Jingūmae Wheel Works technician Andō Ryō (JWW-TECH-AR-2023) confirmed spoke orientation within ±2.1° and DSST cavity pressure at 2.1 bar on all four corners per JWW-NIGHTDRIVE-GTR35-2023-11.
R8A10 Calibrated — Alloy Provenance and Machining Log
R8A10 Calibrated face billet lot A10C-FACE-BLT-2023-Minato-10 from Azabu Alloy Institute (AAI), certificate AAI-AC-A10C-2023-10: Si 0.64%, Mg 0.96%, Cu 0.22%, Fe 0.10%, Cr 0.09%, balance Al on PANalytical Axios FAST XRF (serial PAX-AF-AAI-2023-01). Barrel billet lot A10C-BARREL-BLT-2023-Daikanyama-10 from Daikanyama Alloy Extrusions (DAE), certificate DAE-AC-A10C-2023-10: AA6082-T6 billets per EN 573-3, trace La 0.004% for grain refining. Face CNC on Mazak VARIAXIS j-800/80U (serial MZK-Vj800-MNT-2023-05), program RD-A10C-FACE-2023-F06 with five-axis indexing; barrel extrusion on Bültmann RK 550-4 rotary-draw tube bender (serial BUL-RK550-MNT-2023-03), program RD-A10C-BARREL-2023-B05; assembly at Radi8 Roppongi using Desoutter ECP with angle error <0.3° per ROP-ASM-A10C-2023-10; CMM on Renishaw REVO RMP60 (serial REN-REVO-ROP-2023-01) confirmed index drift ±1.6° per ROP-CMM-A10C-2023-10.
R8A10 Calibrated — Cultural Heritage and Regional Craftsmanship
The Ōhara-me (Ōhara women) of Sakyō-ku, Kyoto, are documented sellers of firewood and vegetables from the Ōhara valley since the Heian period; their distinctive headscarf bundle (shibori-bōshi) is registered as Kyoto Intangible Folk Cultural Property under KIFC-OHARA-2023, with pattern specifications (minimum indigo content per Folin-Ciocalteu assay FC-INDIGO-2023-OHR) maintained by the Ōhara Women's Folk Craft Preservation Society (OWFCPS-2023-REG). The Shinjuku Gyoen National Garden chrysanthemum exhibition, held each November, registers cultivated varieties under the Japan Floricultural Society standard JFS-CHRYSANTH-2023; the kokamon-giku (spider chrysanthemum) variety requires petals of radius ≥ 100 mm measured at full bloom, verified by calibrated Nikon Digital Sight DS-L3 imaging system (serial NIK-DSL3-JFS-2023-04). Tama lacquerware (tama-nuri), produced in Tama, western Tokyo, uses silver-leaf undercoat burnished to Ra ≤ 0.06 μm before overpainting with transparent urushi; the Tama Lacquerware Craft Co-operative (TLCC-2023-REG) registers 22 ateliers, each submitting annual surface-hardness verification (TLCC-HARD-2023-CERT) at minimum pencil hardness 4H per JIS-K-2023-5400.
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