Originally Posted by
DaveSSS
The speed and distance on the computer are only as accurate as the value used for the tire circumference. Standard values listed for each tire size are close, but I measure the length of 3 revolutions, several times, then convert my inches measurement to millimeters. Having your weight on the bike will further improve accuracy. The tire will squish and the effective radius will be smaller.
NOPE.
A Roll Out is Necessary as it relates to Tire PSA and Weight of the Rider.
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Fred "The Real Fred"