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All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple ...
It is a 12-spline spindle proprietary to Truvativ offered as a lower cost alternative to other spline designs. It is essentially a beefed-up square taper spindle with splines instead of tapers. Phil Wood uses a similar splined design to the Shimano bottom bracket. The difference is an 18-tooth versus a 20-tooth as per the Shimano design.
Specialized continue to produce the Stumpjumper, which, like mountain bikes in general, has evolved significantly since 1981 and seen iterations in full (front and rear) suspension and hardtail (front suspension only) options, with the former named the Stumpjumper FSR until the Stumpjumper line-up became full-suspension only.
These consist of a shaft at the hub, with an external screw thread, a straight external spline section and a tapered interface at the hub base. The wheel centers have internal splines and a matching taper to align and center them on the hub. The wheels are fastened to the hub by means of a winged, threaded nut, called a "knock-off" or "spinner."
A spline is a ridge or tooth [1] [2] [3] on a drive shaft that matches with a groove in a mating piece and transfers torque to it, maintaining the angular correspondence between them. For instance, a gear mounted on a shaft might use a male spline on the shaft that matches the female spline on the gear.
1.41” Front (32 spline) 1.46” Rear (32 spline) 1.50” Front (35 spline) 1.50” Rear (35 spline) Inner axle shaft splines: 16, 23, 30, 32, 33 or 35 Aftermarket inner axle shaft splines: 40 for after market, high performance axles, equivalent to Dana 70 components; Pinion shaft diameter: 1.625" Pinion shaft splines: 10 or 29
The tapered key is tapered only on the side that engages the hub. The keyway in the hub has a taper that matches that of the tapered key. Some taper keys have a gib, or tab, for easy removal during disassembly. The purpose of the taper is to secure the key itself, as well as to firmly engage the shaft to the hub without the need for a set screw.
The 3.6 kg (8 lb) NuVinci rear hub. Comparatively, the newer NuVinci hubs from around 2010 [citation needed] weighs 2.4 kg (5.4 lb) The NuVinci CVT may be applicable to many different products using a mechanical power transmission. The only application currently commercialized is the internally geared bicycle hub.