The first one I had, in the mid 1980s, was essentially the same as the one shown in this Lucas advert from the 1950s.
It worked on a similar principle as today's computers: a striker unit was attached to your fork which turned the little star shape wheel on the side of the counter. With only four numbers, it reset every 9,999 miles - something which never affected me at the age of 10.
I've just got a new cateye unit to fit to my summer bike which probably has more computing power than the Apollo missions which put man on the moon.
It's a really neat wireless unit which records cadence and speed from the same sensor. The sensor is housed on the non-drive side chain stay rather than the front and is dead easy to set up.
You can also programme in a different bike and have two totals running as well as a cumulative reading.
Finally, it's a heart rate monitor so it'll tell you exactly how bad you are going!
I really rate cateye products if for no other reason than you can, if you need to, replace clamps and other perishables which don't last forever. The products are spot on too.
So with cadence, heart rate, speed, distance and intervals all measurable, I have no excuse for not being able to identify marginal gains!
Ride safe.
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