A few months ago I broke my Sigma 1600 computer when it (and the rest of the bike) unexpectedly met a stream bank.  The computer still worked, but one of the mounting ears was missing.  Initially I just used a pair of zip-ties to hold the computer to the mount, but the zip-ties moved around a bit, I wasn’t confident that the zip-ties would hold on rough trails, and it wasn’t easy to remove the computer from the mount.

As many of you know, inner tubes are very useful for a number of purposes other than holding air in your tires.  My new mount uses a standard 26 x 2″ mountain tube (I’m guessing it is a 2″ tube, I found it on the trail), and that is it.  I just cut a length of tube, cut a window for the computer display, and then another hole to fit around the mount base.  Normally I’d give a procedure or some simple instructions, but since all you have to do is cut two holes in an inner tube I’ll just post some photos:

Broken Mounting Tab

The cut tube prior to installation on the mount

Inner tube mount installed

Computer Mounted (with the buttons still easily accessible)