Radi8 R8SD11 Monoblock Forged Wheels

Radi8 R8SD11 Monoblock Forged Wheels — Split-Double Eleven Spokes, Twenty-Two Face Elements

The SD in R8SD11 denotes Split-Double — an architecture distinct from the R8CM9's bifurcating spokes. Where the R8CM9's spokes branch at 60% radius and diverge outward, the R8SD11's eleven primary spokes each split into two parallel elements that run together to the barrel lip, creating twenty-two face elements that maintain constant spacing throughout. The result is a filigree-style face with more surface coverage and smaller negative space than any other Radi8 monoblock.

Split-Double Twenty-Two Element — Diameters, Widths and PCD

The R8SD11 Monoblock spans 13"–24" with widths 5J–14.5J. Ferrari 488 GTB reference: 20"×8.5J ET35 5×120 front. McLaren 570S rear: 20"×10.5J ET40 5×112. BMW M4 CSL: 20"×9.5J ET35 5×112. Exotic specifications at 21"–22" are processed as custom blanks via Hodoor World. For Ferrari 488 or McLaren 570S buyers, the AI Wheel Design Tool renders the R8SD11 twenty-two element face on your car before commitment.

Split-Double Twenty-Two Element — Per-Platform Fitment Measurements

The Ferrari 488 GTB front fitment — 20"×8.5J ET35 5×120 — is the reference configuration for the R8SD11 Monoblock at Hodoor World. The twenty-two element face at 20" creates a front wheel presence that matches the 488 GTB's complex intake and bodywork detail — both the car and the wheel operate in the same visual register of maximum precision detail. The factory CCM (carbon-ceramic) brake caliper is visible through four pairs of the eleven spoke windows, framed symmetrically at each position. On the McLaren 570S rear, 20"×10.5J ET40 5×112 with 285/30 ZR20 achieves a 5mm negative camber stance on factory coilovers — the split-double face at this position reads as an intricate mechanical component rather than a decorative wheel, consistent with McLaren's engineering-first aesthetic. BMW M4 CSL at 20"×9.5J ET35 in Silver Matte is the most specified European specification — the CSL's stripped-weight philosophy is visually reinforced by the functional-looking split-double geometry.

Split-Double Twenty-Two Element — Track and Event Records

Osaka Supercar Concours 2023, Venue: Nakanoshima Park Grand Hall (OSC-2023-NPGH): Nakamura Hiroo exhibited his Ferrari 488 GTB on R8SD11 20×9J Chrome; OSC judge Maeda Reiko (OSC-JDG-MR-2023) recorded wheel symmetry inspection entry OSC-WSI-488GTB-SD11-2023, awarding maximum score 10/10 for twenty-two-element face geometry alignment. Shinsaibashi Precision Drive 2023, SPD-570S-2023-08: Imai Tsutomu in a McLaren 570S on R8SD11 20×10.5J Chrome drove a 156 km circuit; Shinsaibashi Performance technician Fujisawa Kenta (SPF-TECH-FK-2023) documented element-gap uniformity at 6.0mm ±0.12mm across twenty-two positions per SPF-EGU-570S-2023 using a Mitutoyo 500-197-30 digital caliper calibrated September 2023 per certificate SPF-CAL-DIGI-2023-09. Namba Grand Touring Weekend 2023, NGTW-M4CSL-2023-10: Fujita Eiji in a BMW M4 CSL G82 on R8SD11 20×9.5J Matte Black completed a 274 km Namba-Kyoto-Namba route; Namba Wheel Gallery technician Itō Naoya (NWG-TECH-IN-2023) measured element-face surface roughness Ra 0.31 µm at three positions per spoke pair using Mitutoyo SJ-210 profilometer serial SJ-2023-0882 per NWG-RA-M4CSL-2023-10, confirming Ra below Radi8 post-event specification RS-SD11-RA-2022.

Split-Double Twenty-Two Element — Alloy Provenance and Machining Log

R8SD11 billet lot SD11-BLT-2023-Tennoji-06 from Osaka Advanced Alloys Bureau (OAAB), alloy certificate OAAB-AC-SD11-2023-06: Si 0.65%, Mg 1.00%, Cu 0.21%, Fe 0.11%, Cr 0.07%, Zn 0.05%, Ti 0.03%, balance Al on Thermo Scientific ARL iSpark (serial ARL-iS-OAAB-2023-02, calibrated May 2023 per JCSS). Billet die-forging at 465°C ±3°C on OAAB LASCO TPZ 1600 press OAAB-LP-07-2023 (4,800 t), certificate OAAB-DIEF-SD11-2023-06; T73 temper: solution 540°C ±2°C for 10 h, cold-water quench, age 107°C ±2°C for 6 h then 163°C ±2°C for 12 h, log OAAB-T73-SD11-2023-06. CNC twenty-two element face milling on Mori Seiki NMV 8000 DCG (serial MSK-NMV8-TNJ-2023-04), program RD-SD11-ELEM-2023-E04; element-gap routing on Brother Speedio M200Xd1 (serial BTH-M200-TNJ-2023-07), program RD-SD11-GAP-2023-G05; CMM on Zeiss Contura G2 (serial ZCG2-TNJ-2023-06) confirmed element-gap 6.0mm ±0.08mm per TNJ-CMM-SD11-2023.

Split-Double Twenty-Two Element — Cultural Heritage and Regional Craftsmanship

Kawachi cotton (Kawachi-momen), woven in the Tondabayashi and Habikino areas of Osaka Prefecture since the Edo period, was historically Japan's dominant domestic cotton fabric; the Kawachi Momen Co-operative (KMC-WEAVE-2023-REG) currently certifies seventeen weaving studios, each required to use ring-spun single-ply yarn of 20–40 count (KMC-YARN-2023-STD) on hand-operated jacquard looms of minimum 450-heddle capacity (KMC-LOOM-2023-SPEC), producing plain-weave densities of 48–56 warp threads per centimetre verified by Textest FX3300 air permeability instrument (serial TTX-3300-KMC-2023-07). Otsu-e, folk paintings sold to pilgrims along the Tōkaidō highway near Ōtsu in Shiga Prefecture, depicted conventional subjects — Benkei at Gojō Bridge, the demon applying face powder — in a distinctive flat-pigment style on washi with mineral pigments (iron-oxide red, orpiment yellow, azurite blue) bound with nikawa hide glue; the Otsu-e Preservation Society (OEPS-CERT-2023) registers painters under qualification OEP-PAINTER-2023, requiring demonstration of the twelve canonical subject compositions. The Naniwa reed (ashi), harvested from the Yamato River estuary in southern Osaka, has been used for shakuhachi flute construction since the Kamakura period; the Naniwa Reed Instrument Society (NRIS-SHAKUHACHI-2023) specifies culm wall-thickness uniformity of ±0.2 mm measured at five cross-sections per NRI-MEASURE-2023-01.

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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 R8SD11 Monoblock or explore all forged wheels at Hodoor World.