However, it’s easier to measure – which can make it more useful when wanting to make a quick comparison between two frames in a store, for example. The down tube length is the distance from the middle of the bottom bracket to the bottom of the head tube.Īs a bike geometry comparison metric, it serves a similar function to reach in that it gives a sense of how spacious the bike will be to ride. Stack height dictates the minimum handlebar height with no spacers being used. It refers to the vertical distance between the top of the head tube and the middle of the bottom bracket. Stack height can almost be thought of as the vertical equivalent of reach. It’s another useful metric when sizing a bike. The reach determines how spacious the bike will feel when riding out of the saddle, and to a lesser extent when riding seated too. ReachĪ frame’s reach is defined as the horizontal distance between the top of the head tube to the middle of the bottom bracket. It’s a much more useful metric than actual top tube length, which fails to account for the angle of the top tube.Įffective top tube length is measured as a horizontal line between the top of the head tube and the seatpost. The effective top tube length gives a sense of how spacious a bike will feel from the saddle. It’s measured from the top of the seat tube to the middle of the bottom bracket. If the seat tube length doesn’t suit the rider, it’s likely the rest of the bike’s geometry will be thrown off too. Seat tube length has a minimal effect on handling in itself, but determines the maximum and minimum seat height. The seat tube length is one of the most important measures of frame size. Let’s get started! 11 Key Elements of Bike Geometry #1. Ready to get to grips with the basics of bike geometry comparison? With that in mind, we’ll be walking you through the basics of bike geometry and bike geometry comparison, covering: The geometry of your bike affects everything from how it handles, how well it fits you, how comfortable it is to ride, how aerodynamic the riding position is, and how efficiently you can pedal, plus much, much more. Bike geometry is one of the defining features of frame design.
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