Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
The Wayback Machine - https://web.archive.org/web/20080216213650/http://www.geocities.com:80/d_halem/wheel/wheel.html
Spoke Length Calculator
By Dan Halem
It seems that every broswer implements the drop down menus differently.
I am sorry if the program does not look quite right on your broswer. I am
currently looking into ways to improve this part of the program.
Formula from "The Bicycle Wheel" by Jobst Brandt.
Hub and rim data from the "Wheel Wizard" website.