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Zipp Track Hubs take every feature to the next level of strength, stiffness, and bombproof durability. With a 60mm spoke hole circle diameter and a 15mm oversized solid 17-4 stainless steel axle, a Zipp track hub is both laterally and torsionally stiffer than one constructed with a traditional 47mm diameter hole circle and 1018 steel axle. Without removing any material from the hub flange, our Spoke Hole Impact Forming Technology improves the grain structure and hardens the alloy around the spoke hole. Using SHIFT and the same exclusive Z310.9 alloy as the 88 and 188 road hubs, our track hub flanges are practically impervious to cracking around the spoke holes with any spoke tension or lacing pattern. These bombproof hub shells ride on ultra-precise Swiss bearings with non-contact shields to eliminate all seal drag. Track hubs are supplied with Zipp's top quality track nuts, which replace the standard serrated interior surfaces with floating washers made of hardened stainless steel. Track cog and lock ring are: 1.375"x24TPI ISO and 1.290"x24TPI LH ISO respectively. Rear nuts are M10x1 and front are M9x1, all threads are ISO threadform, and all parts are roll formed to FED-STD-H28/21 which supersedes MIL spec S7742, and 2x tighter than the ISO allowed tolerance for these parts.
Wire EDM
Electron Discharge Machining allows us to cut the materials for our rear hub drive internals after they’ve been hardened through heat treating, negating the warping and imprecision caused by the heat-treating process.
Steel Bearings
Zipp is the only company specifying Swiss made highly specialized ball bearing cartridges. Working with a family owned Swiss bearing manufacturer, Zipp is able to attain a superior level of bearing smoothness and long life. Zipp ball bearings are specified to 10 millionths of an inch tolerance, guaranteeing that they are at least 2.5 times rounder and better matched than most company’s “high precision” balls, and more than five times tighter than most “precision” balls.
Ceramic Bearings
When we talk about ceramic bearings, we're talking about the best: Silicon Nitride (Si3N4) ceramic bearings that are more than 1,000 times rounder than any steel bearing, even the industry-leading ones we spec. Si3N4 bearings have an incredible maximum spin rating of 300,000 rpm under load and tolerances less than 2 millionths of an inch among the entire bearing set.
Shift™ (Spoke Hole Impact Forming Technology)
Spoke Hole Impact Forming Technology is a radical manufacturing process. At the heart of SHIFT is a proprietary alloy called Z310.9 that’s nearly twice the strength and more crack resistant in hub flanges than the commonly used 6061 alloy. |
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