This is my piece of old school technology, a CATEYE CC-AT-100. It came on the market in 1995 for $100. The altimeter that I found to be very accurate works with barometric pressure. Every mountain pass has a posted elevation that I assume is accurate, it was always within 5 feet. At sea level it would vary as much as 20 feet.
The unit has a wire down to the front fork to a sensor that tracks a magnet on the wheel spoke. You set the unit by tire size which is amazingly accurate. I used the unit for daily miles and would reset it daily. It saves totals but I just use it for current speed, elevation and daily miles.
I don't worry about it rain or shine it is bullet proof. This is actually a new one, I found it in a reduced bin in a bike shop. It was brand new but it was missing the bar mount and wiring harness, so it was only $5. My original unit had some wear but it worked perfectly.
I don't really need this my GPS will do everything and more but I like it because it looks vintage like me.
After the nuclear EMP attack I think this will still work along with my Zippo lighter, stem wind pocket watch and pocket knife.
Most miles in a day - 155 miles - Montana into North Dakota, neutral wind and powered by peanut butter and jelly sandwiches.
Top down hill speed - 50 MPH - Down a crowded California freeway grade. I got caught up in the draft from several tractor trailers. I only tried that once.
Highest altitude - 9850 FT - Crossing the Rockies in Colorado I was pushing the bike at at a blinding 3.5 MPH.
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