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Thorn Cycling Forums > Community > Non-Thorn Related > Computer fitting to BROMPTON?
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Author Topic: Computer fitting to BROMPTON?  (Read 914 times)
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john28july
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« on: April 23, 2007, 10:41:13 AM »
HELP!
I have a Brompton which has 16" (349) wheel size. I also have a new Sigma Computer which is fitted and is working very well.
However it has not been correctly set up for the Brompton wheel size!.
Please can someone tell me the correct input figure for this size wheel for the SIGMA computer?
I may be slightly mathematically challenged here as I can setup computers for bigger wheel bikes OK. Its just this size. By the way it is a FOUR figure number required.
John.
www.pbase.com/john28july
« Last Edit: April 23, 2007, 10:44:20 AM by john28july » Logged
stutho
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« Reply #1 on: April 23, 2007, 11:11:07 AM »
What ISO tyre size are you using John?
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stutho
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« Reply #2 on: April 23, 2007, 11:57:55 AM »
And the magic number is... 1335

I've calculated this number but I would expect it to be accurate. (Better than 2%)
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stutho
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« Reply #3 on: April 23, 2007, 12:26:09 PM »
[Smiley]1335 is within 0.3% of 1330 and I suspect my figure is the more accurate one!!

NB conversion for miles is 1.609 therefor for miles the figure you need is 0830
« Last Edit: April 23, 2007, 12:30:47 PM by stutho » Logged
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