Library(data.table) # magical data frames Library(here) # here makes a project transportable MATTER of FACT: How to Understand Gravel Bike GeometryĪdvanced Bicycle Frame Geometry: Steering Speed, Weight Distribution, Tipping Angles (YouTube) knitr::opts_chunk$set(echo = TRUE, The bike geometry Bible - Everything you need to know about the shape of your bikeįrame Geometry Masterclass: Does The Evil Chamois Hagar Make ANY Sense? This project offers a different way of comparing frames. , geometrygeeks.bike and are invaluable sites.Some missing data were computed based on other measures or taken from online reviews. All bike data were taken from manufacturer’s web sites.I don’t have a permanent web location for this.This is a spare-time project – it will get cleaned and polished. This page is disorganized and some measures may be left undefined and analyses unexplained.The 2D scatterplots show the bikes on the boundary between different classes and why new data or different tree algorithms can create slightly different classifications.There are multiple subjective decisions on the workflow to this classification. The project uses the hierarchical trees to divide the frames spec’d to my size into three classes: “gravel-race”, “gravel-endurance”, and “gravel-trail”.The clustering is pretty stable but not rigid – adding a bike can occasionally move a frame from one cluster to another! so do not take these as objective or even fixed. There are many subjective decisions in tree building. The project uses hierarchical trees to give a sense of frame geometry similarity.There is noise in size charts, which adds some arbitrariness to the precise location of a model, especially for the length measures that vary across frame sizes. The project uses 2D scatterplots of frame measures to compare all bikes in the database across all sizes and across all frames that are spec’d to my size (generally M or 56, but this varies among makes and models).This project compares and classifies gravel bike frames. Gravel Bike Geometry Classifier A working document attempting to classify gravel bike frame geometries using some numerical methods Jeffrey A.
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