Carry the rear wheel, transfer its loads into the bearings, and take drive torque from the tripod.
Same as the front spindle plus the tripod interface. The tripod insert sits between the hardened tripod rollers and this aluminium part specifically so the spindle is not the wear surface.
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.
Al 7075-T6, with a 440C stainless tripod insert.
The switch from 18 in to 16 in tires on CR25 raised driveshaft angles, but the tripod housings within the rear spindle were not deepened to match. That caused multiple tripod ejections and limited rear ride height and camber adjustment. Depth was increased from 1.25 in to 2.00 in to maximise tripod depth without shaft interference at full droop. Fault Vault, 2026-07-12, CR26I, Manufacturing, Compromised Failure. During the second mill setup the work-holding moved during the second plunge operation, which made the tripod pocket too large and unsalvageable. Corrective actions recorded: reduce feed and plunge rates, pre-drill a hole for the clearing operation, drill the flower petal holes so the part can be re-probed, and hammer and check the stock and vice after every operation. Reducing step-down for multiple depths was also proposed.
Tripod housing depth increased from 1.25 in to 2.00 in, to maximise tripod depth without shaft interference at full droop after the move to 16 in tires raised driveshaft angles.
Nothing in CrimsonStorage covers these yet.