Archive for the Cycling Category

bike update

Posted in Cycling on October 28, 2005 by Simon

It has been some time sinds my last post, and a lot has happened since.
I’ve been adding the weels, drivetrain, seatpost including saddle, the steer and shifters and finally the brakes and cables. The only thing remaining is making the steer the right hight and adding the remaining cables.

Some pictures of the process.

new wheels

Posted in Cycling on September 7, 2005 by Simon

Recently i decided to build me a cool new roadbike. I now have a second hand steel koga monster, which is a very nice bike actually and still in good shape, but with 10+ kg a bit on the heavy side. So, as i like to build things and a bike is not silicium related it seemed a nice challenge.

The first part i decided to go for was a vanTuyl frame which i could get cheap because it’s a last years model. They even paint it nice matte black for me. Unfortunately it still has to return from the paintshop so i’ll have to be patient.

But on the good side… today my new wheelset came in. The mavic cosmic elite 05, and they look cool!!. Darn thing is that some days after i ordered them stumbled upon a site where they got some bad user reviews. They also got an equal amount of very positive reviews to though. It looks a bit like there’s an equal amount of getting a good or a bad set… so let’s hope chances are with me. I do have to buy some good rimtape though as they came with some very scary looking plastic ones. I don’t dare to put my tubes between those sharp looking edges.
More will be coming up as soon new parts arrive


Posted in Cycling on August 2, 2005 by Simon

Liking road cycling and gadgets you can hook up to a computer i just bought a Ciclosport Hac4 heartrate monitor with lots of functions and cadence sensor (hac4 at It comes with a usb interface for sending stored data to a computer. This usb interface is actually just a serial to usb converter and data transmission is still only 9600 bauds …. brrr. So the first thing to do was to see if it will work on my linux box without having to make an alternative interface. Fortunately opening the interface shows a single FTDI FT232BL chip which is supported since 2.4, so no problems. Next thing is to see if there are some linux based tools already out there so i don’t have to use the shitty windows based software (why do those cool gadgets always come with crap software ?????). I found hac4linux which seems like a nice replacement. It prints the graphs niceley and no fuzz around it. There are some points i don’t like and might fix later, for now it is a very nice tool. It also supports a number of other devices like the polar S710.

Further, to make my training life a bit easier i wrote two little tools. One to compute my training zones according to the karvonen formula based on max hart rate and rest hart rate. The other one lets me see what speed a certain gear ratio and cadence combinaton gives.
Both can be found here.