I bought this wireless cycle computer to go with my new bike for two reasons. One was the fact that it had lots of functions and the second was the fact that it said on the box that it was suitable for mountain bikes. Also it wasn’t cheap so I thought (erroneously) that it had to be good.

So I installed it, which was fiddly; but no more so than a wired cycle computer. The instructions specified a maximum of 18 inches (1.5 feet) between the top of the sensor and the display unit. However at that distance no signal was being received by the display unit.

Tests showed that unless the sensor was 14 inches or less from the display unit then the signal was lost. On a mountain bike with a 20 inch frame this distance is impossible to achieve.

So I’ve been unable to check out the functions of the Comp 150 because it didn’t do what it said it would do; support 18 inches between sensor and display.

Hust in passing I found the Topeak web site attractive to look at; but lacking is useful information. The FAQ section of the site didn’t work at all and there was no troubleshooting section that I could find.