Bicycling

DisgustipatedinCA

(12,530 posts)

8. In my previous post, I mentioned that the Cateye was within a couple of hundredths of my GPS

Thu Feb 28, 2013, 07:56 PM

Feb 2013

Since I wrote that, I've noticed a bigger difference between the GPS and the Cateye. I'm not totally sure what accounts for the difference. It's either the vagaries of my phone's GPS unit (entirely possible), or it's the fact that I've switched from riding at 85PSI to riding at 100PSI. I think that may make the diameter of the wheels just a little larger, and therefore, I'm going just a little more distance with each revolution of the tire than I was at 85PSI. It doesn't matter all that much. After a 43 mile ride last Saturday, the difference in the two trip meters was about half a mile. Not a huge deal.

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