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[[Category:Parts]]
[[Category:Motion parts]]

=Introduction=
[[File:Spindle photo.jpg|thumb]]
In an automobile, the wheel spindle, sometimes simply called the spindle, is a part of the suspension system that carries the hub for the wheel and attaches to the upper and lower control arms.

Spindles are carried by [[steering knuckles]] or "uprights". Although, the terms "steering knuckle" and "upright" are sometimes used interchangeably with "spindle", they refer to different parts.

=Challenges=

=Approaches=
[[File:Spindle diagram.jpg|thumb]]

* [https://www.couplemate.com.au/trailer-caravan-axles/trailer-stub-axle/40mm-square-axle-stub/ 40mm square stub axle]
* [https://www.truckspring.com/products/FlexiRide-Torsion-Half-Axles-Non-Adjustable-4-4-Inch-Bolt-Circle-Hubs-935-lbs-Capacity__FF-93-1.aspx FlexiRide Torsion half axle] and [https://www.truckspring.com/products/FlexiRide-Base-Plate-550-lbs-935-lbs-Half-Axles__FS30-3.aspx mounting plate]
* [https://www.rigidhitch.com/sp-35684-axle-spindle-square-tapered.html RigidHitch.com:  Trailer Axle Spindle for 1-3/8 to 1-1/16 I.D. Bearings] plus machining
* [https://www.rigidhitch.com/asr3500s04-axle-less-suspension-system.html RigidHitch.com:  Timbren® Axle-Less Suspension - 3,500 lb Capacity/Pair] (hole spacing near 40mm and 60mm)

=References=
* [https://en.wikipedia.org/wiki/Spindle_(automobile) Wikipedia: Spindle (automobile)]
* [[File:Flexiride brochure 1.pdf|thumb]]