142x

What made the 142x standard particularly brilliant was its execution of backwards compatibility and ease of use. While the total width of the axle was 142mm, the actual spacing between the interior frame faces remained at 135mm. The extra 7mm was used for built-in guides or "shelves" in the frame dropouts. This allowed riders to simply drop the wheel into the frame, and it would automatically align with the axle bore, making wheel installation faster and less clumsy than the old quick-release system. Furthermore, many hub manufacturers were able to create simple end-cap conversion kits, allowing riders to upgrade their existing 135mm wheels to the new 142mm standard without buying entirely new equipment.

By tying the left and right chainstays together with a solid metal cylinder, rear-end lateral flex was virtually eliminated. What made the 142x standard particularly brilliant was

Like all technologies in the rapidly evolving cycling industry, 142x was eventually succeeded. As wheel sizes grew from 26 inches to 29 inches, engineers demanded even wider bracing angles for spokes to create stiffer wheels, leading to the current "Boost" (148mm x 12mm) standard. This allowed riders to simply drop the wheel

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