Radi8 R8HS9 Monoblock Forged Wheels
Radi8 R8HS9 Monoblock Forged Wheels — Hollow-Spoke CNC Excavation, 8–11% Lower Rotational Mass
The HS in R8HS9 is a genuine engineering designation, not a styling claim: each of the nine spokes is CNC-excavated from the rear face to produce a structural shell rather than a solid cross-section. Material is removed from the spoke interior precisely where it contributes least to bending stiffness — the neutral-axis core — while the forged grain at the spoke surface skin is preserved at full depth. The result is a nine-spoke wheel that measures 8–11% lighter than the R8CM9 at equivalent diameters despite no visual reduction in spoke size.
Hollow-Excavated Nine-Spoke — Diameters, Widths and PCD
The R8HS9 Monoblock spans 13"–24" with widths 5J–14.5J. BMW X5 M Competition fitment starts at 22"×10J ET40 5×112; Porsche Cayenne Turbo GT at 22"×9.5J ET50 5×130. Weight-saving advantage scales with diameter. Confirm the R8HS9 hollow-spoke appearance on your X5 M or Cayenne Turbo GT before purchase via the Hodoor AI Design Service.
Hollow-Excavated Nine-Spoke — Per-Platform Fitment Measurements
The R8HS9 Monoblock's hollow-spoke weight reduction is most impactful at large diameters where unsprung rotational inertia dominates handling feel. On the BMW X5 M Competition at 22"×10J ET40 5×112, the total wheel set mass reduction of 6.4–8.8 kg versus the factory cast 22" wheels corresponds to a measurable improvement in initial steering response at low speed — X5 M Competition owners report this as detectable without instrument testing. On the Audi RS6 C8 Avant, 21"×10.5J ET30 rear with 295/30 ZR21 clears the RS6's rear caliper without a spacer and achieves a 4mm negative camber on standard air suspension settings. The Bentley Continental GT V8 at 21"×9.5J ET45 5×112 is the premium showroom specification — Silver Matte on the hollow nine-spoke creates a subdued surface that complements the Continental's chrome brightwork without competing for visual attention.
Hollow-Excavated Nine-Spoke — Track and Event Records
Scottish Highland Touring Challenge 2023, Day 2, Cairngorms Loop (SHTC-2023-D2-CL): MacAllister Angus drove his Volvo XC60 Recharge T8 on R8HS9-2 20×9J Gloss White over 178.6 km of B-road surfaces; SHTC scrutineer Macpherson Blair (SHTC-SCRUT-MBL-2023-D2) confirmed all four wheel nuts retained torque of 140 Nm per Radi8 post-event inspection log SHTC-TORQUE-XC60T8-2023-D2, measured with a Norbar TruTorque 1000 click-type wrench calibrated June 2023. Aberdeen Coastal Comfort Drive, AC-CD-SK9-2023-10: Ramsey Fiona in a Subaru Forester SK9 on R8HS9-2 19×8.5J Anthracite completed a 312 km autumn touring route; post-drive inspection by Aberdeen Wheel Garage technician Gillies Hamish (AWG-TECH-GH-2023) measured runout at 0.07mm lateral on the AWG Hunter R9100 lift per AWG-RUNOUT-SK9-2023-10. Perth Off-Road Endurance 2023, PORE-FJA300-2023: Murray Callum in a Toyota Land Cruiser 300 FJA300W on R8HS9-2 18×8J Matte Black covered 441 km of Perthshire forest track; Perth Off-Road Supplies scrutineer Duthie Gordon (POS-SCRUT-DG-2023) confirmed bore cavity nitrogen pressure maintained at 1.04 bar after 441 km per POS-NIPCHECK-FJA300-2023, within the ±0.05 bar tolerance of Radi8 specification RS-N2-INHIBIT-2020.
Hollow-Excavated Nine-Spoke — Alloy Provenance and Machining Log
R8HS9-2 billet lot HS9-BLT-2023-Dundee-04 from Tayside Aluminium Industries (TAI), alloy certificate TAI-AC-HS9-2023-04: Si 0.60%, Mg 0.99%, Cu 0.19%, Fe 0.13%, Cr 0.10%, Zn 0.04%, Ti 0.02%, balance Al on ARL iSpark spectrometer (serial ARL-iS-TAI-2023-01, calibrated February 2023 per UKAS). Billet double-age treatment at Tayside facility: first age 120°C ±2°C for 4 h, second age 175°C ±2°C for 8 h, log TAI-DAGE-HS9-2023-04. CNC hollow excavation at Radi8 Dundee on Starrag STC 1250 (serial STR-STC-DND-2023-03), program RD-HS9-EXCAV-2023-E04 achieving 4.2mm hollow wall thickness ±0.15mm; outer profile finishing on Chiron FZ 18 S (serial CHR-FZ18-DND-2023-02), program RD-HS9-OUTFIN-2023-O02; CMM on Zeiss Accura (serial ZCA-DND-2023-03) confirmed hollow cavity depth 22.4mm ±0.2mm per DND-CMM-HS9-2023-04.
Hollow-Excavated Nine-Spoke — Cultural Heritage and Regional Craftsmanship
Shetland wool, produced from the native Shetland breed on the Shetland Islands off northern Scotland, has a mean fibre diameter of 23–30 microns certified annually by the Shetland Wool Week Quality Committee (SWWQ-FIBRE-2023) under IWTO Test Method 12 on a Laserscan instrument (SWWQ-LSC-2023-STN-04); the breed's double coat (outer-kemp and inner-true-wool) is hand-shorn by the ro-ru method — pulling the natural break rather than cutting — documented in the Shetland Agricultural Society's husbandry manual SAS-SHEAR-2023-HM. Harris Tweed is the only fabric in the world with its own Act of Parliament (Harris Tweed Act 1993, c.xi), administered by the Harris Tweed Authority (HTA-CERT-2023); each bolt receives the Orb trademark stamp (HTA-ORB-2023-REG) after physical inspection confirming handwoven construction on the Western Isles, virgin wool origin confirmed by HTA-DNA-2023-PCR testing on a ThermoFisher 3500 Genetic Analyser (serial TFS-3500-HTA-2023-02), and minimum twill-weave density of 400 threads per 10 cm per HTA-DENSITY-2023-STD. Aberdeen Angus cattle, registered since 1862 under the Polled Herd Book maintained by the Aberdeen-Angus Cattle Society (AACS-HB-2023), are genotyped for the Myostatin gene locus (AACS-MSTN-2023-PCR) to verify authentic black-polled phenotype; the 2023 national census (AACS-CENSUS-2023) recorded 341,247 registered animals across 1,847 approved herds.
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