Retain the wheel bearing stack on the rear spindle and set bearing preload.
Suspension hardware is standardised across every point on the car: NAS-620x National Aerospace Standard bolts, MS21042-x Military Standard jet nuts, and FK alloy steel rod ends. Bolt size at every joint is determined against shear yield and axial yield with a minimum factor of safety of 1.8, and minimum torque is calculated from the required clamping force rather than taken from a table.
No part-specific design process is documented. The Wheel Hubs subsystem design process applies: 1. Take wheel loads from the cornering, braking and combined load cases. 2. Size the spindle shaft for fatigue at the worst case, then size up to an appropriate bearing and remove as much inner material as possible. 3. Select bearings on required bore, spacing and its effect on moment reaction, static load rating against worst-case load, dynamic load rating against average load and expected life, and then the lightest and smallest option that fits. 4. Design the upright to connect the geometry points, sizing every hole and tab. 5. Analyse. Wheel load applied as a remote load from the contact patch to the bearing faces; lower ball joint and tie rod mount bolt faces react lateral and longitudinal motion; upper ball joint reacts all translation; brake caliper bolt faces take a moment reaction for braking. Global element size 0.045 in, second-order wedge elements. 6. Cross-check with the full-corner model, then state the resulting compliance. CR26I effective angular deformation of the corner in cornering is 0.32 degrees of camber change, including spindle, bearings, upright, tie rod mount and top mount.
Purchased to specification.
Aluminium, MIL-A-8625F Type III hard coat anodised.
No entry in the Fault Vault. The front spindle nut had a cross-threading failure on CR22 (see that part's page); the rear did not.
CAD mass, CR26I master assembly: 0.122 lb (0.055 kg), 2 instances, 0.244 lb total. CG at X 83.00 in, Y -0.00 in, Z 8.00 in in vehicle coordinates. (CAD component: CR25_SUS_RearSpindle_Nut_RevFinal) CAD mass, CR25 master assembly: 0.122 lb (0.055 kg), 2 instances, 0.244 lb total. CG at X 83.00 in, Y -0.00 in, Z 8.00 in in vehicle coordinates. (CAD component: CR25_SUS_RearSpindle_Nut_RevFinal) CAD mass, CR26E master assembly: 0.119 lb (0.054 kg), 2 instances, 0.238 lb total. CG at X 83.00 in, Y 0.01 in, Z 8.00 in in vehicle coordinates. (CAD component: CR26E_SUS_R_SpindleNut) CAD mass, CR22 master assembly: 0.128 lb (0.058 kg). CG at X 83.00 in, Y -21.10 in, Z 9.00 in in vehicle coordinates. (CAD component: CR22_SUS_R_Spindle_Nut_RevFinal) Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. CR22_SUS_R_Spindle_Nut_RevFinal (in): 6061-T6 CR22_SUS_R_SpindleNut_Washer_RevFinal (mm): 70.5, 2.0, 6061-T6 CR22_SUS_R_Spindle_Nut_RevFinal (mm): 12.7 Source: SolidWorks mass model exports: CR22 (5 May 2024), CR25 (4 Jul 2025), CR26I (30 Jul 2025), CR26E (22 Mar 2026) | Cost report drawings: CR22/Document Submissions/Cost Report/Suspension/Cost Report Drawings/Wheels, Wheel Bearings & Tires/Rear Wheel Spindle/CR22_SUS_R_Spindle_Nut_RevFinal.pdf; CR22/Suspension/Design/01_Cost_Report/Cost Report Drawings/Wheels, Wheel Bearings & Tires/Rear Wheel Spindle/CR22_SUS_R_SpindleNut_Washer_RevFinal.pdf; CR22/Suspension/Design/01_Cost_Report/Cost Report Drawings/Wheels, Wheel Bearings & Tires/Rear Wheel Spindle/CR22_SUS_R_Spindle_Nut_RevFinal.pdf Quantity per car, as costed: 2
Nothing in CrimsonStorage covers these yet.