If someone had asked me some time ago about bicycle frame geometry I would have answer simply in terms of 19”, 20” for MTB or 56, 58 for a road bike. I was of course aware of basic measurements such as Top Tube length or Standover Height and have passed a few times my measurements through a fit calculator but I haven’t given much thought from a geometric, or trigonometric to be more precise, point of view....
I am searching for a new bicycle. Partly as a gift to one self, partly to make sure if the current one fails I will not be under pressure to buy one fast. As such I have done a lot of research into the subject. One of the elements I have found is that I could achieve a better price/quality ration buying online especially from German based online shops. This poses a big problem on testing since frame geometry differs a lot from manufacturer to manufacturer....
When I plan a cycling trip I search for tracks in the target area and try to maximize the “fun factor”. Thus I often end up with a bunch of tracks from which I want to use parts. The difficult task is to cut, sometime reverse and combine the source tracks into a planned track. Most of the times this seems a too much waste of time since it involves a number of operations in qlandkarte (cutting and combining) and gpsbabel (reversing)....
This is a simple script which reverses the direction of a gps track stored in a gpx file: <pre lang="bash">#!/bin/bash gpsbabel -t -i gpx -f $1 -x transform,rte=trk,del -o gpx -F 1.$1 gpsbabel -t -i gpx -f 1.$1 -x reverse -o gpx -F 2.$1 gpsbabel -t -i gpx -f 2.$1 -x transform,trk=rte,del -o gpx -F rev.$1 rm 1.$1 2.$1 will generate a rev.file.gpx from file.gpx Comments: Gon - Apr 5, 2015 However the timestamps will be now in a wrong time order… It would be cool to be able to maintain the time gaps between trackpoints together with the start/end times....
I’ve been using my GPS for cycling trips for a few months now and I’ve decided to write a small list of tips and tricks I’ve found useful or found out during these months. Most of the concepts here are general but the technical examples applies to linux which is my main operating system. Terms A waypoint is a set of coordinates for your orientation. It can either be created on the track to mark a position or it can be created on the map and used on the track for in track later orientation....