Ted Bennett wrote:
>
> > I am looking for a simple spoke calculator, specifically w/ a database of hubs and rims that is
> > current. I am having trouble finding a database that includes mavic cxp21 650c rims. thanx, andy
>
> There are plenty of spoke length calculators on the net, based on the formula in The
> Bicycle Wheel.
No, all spoke length formulas, including that in the Bicycle wheel are based on the simple geometric
"length of a line in 3-space" formula. The Bicycle Wheel is a very good book, but it didn't invent
geometry. (It is possible to aquire a spoke length formula via the "folding about a line" technique
taught in Engineering design graphics, and this amounts to finding a 2-d solution and then folding
it to the third dimemsion. Of course the answers are equivalent even though the appear different.)
Damon Rinard was nice enough to do a good deal of work and Sheldon was nice enough to archive
Damon's site:
http://www.sheldonbrown.com/rinard/spocalc.htm
> I use one that I made myself using a spreadsheet. It does require measurement of the effective rim
> diameter, easy to do with two spokes (with nipples) in opposing holes, hub flange separation and
> hub spoke circle diameter.
>
> Measuring those yourself is more reliable than depending on published databases of unknown
> accuracy.
>
> --
> Ted Bennett Portland OR
