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Re: [ST] sigma sport 800



Due to something I've learned about tires, I would highly recommend that you not use someone else's figures.  The reason being is not all 180 tires are 180.  Some are on what they say is the narrow side of 180 or the fat side of 180 this means the profile will vary for different tire makes, also depending on your weight you will cause the tire to deform a different amount than someone lighter or heavier than you. Also changing the effective circumference.  Here's the thing to do.  First make sure you have your tires properly inflated.  Second Get a friend to help w/ a piece of chalk.  Get on the bike.
Have the friend mark the tire and pavement with the chalk.  Then roll forward one rotation.  Mark the pavement at the point where the chalk is pointing straight down.  now measure from chalk mark to chalk mark and convert to millimeters.  This will give you the number to put in.  


At 09:01 PM 6/28/01 -0400, you wrote:
>I recently saw (Can't recall where) that someone had posted the input 
>values to be used when setting up a Sigma unit which included the correct 
>numbers for the wheel diameter.....any help would be appreciated.
>
>Denis Liakos
>01 BRG ST
>
>
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