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Old 09-04-2009, 04:28 PM
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Russell Russell is offline
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Join Date: Apr 2009
Location: MA
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Default Re: Why I don't trust mechanical speedometers.

Originally Posted by Comrade Alfonzo View Post
from what I hear the mechanical speedos were designed for 27in wheels with 27/1.25in tires, aka old schwinns like my '73 'Burban because they were so common
I would be supprised if they are accurate for any wheel size over the full scale. However it can be calibrated for reasonable +- 3mph over 25 to 30% of the scale. It probably is diffrent with each unit. What do you get for accuracy with the 27" tire?
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