Quote:
Originally Posted by PaleMelanesian
Just last month, I informally tested 55 vs 60 psi. There's a certain long but gentle downhill on my commute, about 1/2 mile long. 55 psi would just maintain speed at 40mph, while 60 psi would gain about 5, to 45mph at the bottom.
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Quote:
Originally Posted by whitevette
Excellent road test! As long as one pays attention to head/tailwinds and conducts these tests in the dry ( no wet, no damp!) the results should impress any disbeliever. Wait! Is gravity constant in your test area? LOL!  |
LOL! Dry both times, wooded back roads so wind is not a factor. Temperatures were about the same both times, mid-70's. They were two different days, but on my same commute, both with a cold start 2 miles earlier. Very much apples-to-apples, but not scientifically controlled.
I noticed the bit about only maintaining 40mph, so I checked my tires and found they were down to 55. I inflated to 60 and recorded the 45mph terminal speed the next morning.