The problem with most spin bikes is that there is no cadence function and you have to calculate cadence by counting your pedal strokes (which I find irritating). The other problem is the bikes that do have this functionality cost about twice as much as a normal one. (I know, the CylceOps is nicer for other reasons also, I would love one).
Now you can have cadence, trip distance, average speed, total distance, etc. on your bike without having to pay the extra $800.
Step 1: Materials:
Cyclecomputer with cadence.- I used a cateye because it was inexpensive. You could use a wireless one and the whole process would be cleaner.
1/2" copper tubing 1.5 - 2" long
Black Electrical Tape
2 Zip ties
Clear silicone caulk