Evolve & Erase: Seat post sizing differs crucially from other bike standards due to the dominance of dropper posts. The market now revolves around four standard sizes - 27.2mm, 30.9mm, 31.6mm, and 34.9mm.
Historically, bike shops faced numerous seat post sizes. From 25.0mm to 32.4mm, with 0.2mm increments and additional BMX variants, the evolution to four standard dropper post sizes simplifies compatibility and availability.
Older bikes with non-standard post sizes like 27.0mm and 30.0mm required modifications for dropper post installation, highlighting the significant shift towards standardization in modern mountain bikes.
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