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Its all about inventory and stock levels. Historically frames came in increments of 2 or 3 cm. So one model might be stocked in 48/51/54/57/60 cm or 48/50/52/53/56/58/60 By having more adjust in the seat post, the supplier can stock three frame sizes of small/medium/large and make up the in-between sizes with longer or shorter seat posts, which will fit ...

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