An example of data being processed may be a unique identifier stored in a cookie. Does anyone even make that? Also, the resulting value is a less-convenient number to work with, a single digit plus two decimals. Listing of internal hubs is A>Z by manufacturer, then by number of speeds, type and age. Its not perfect; changes in cassette size have a larger overall impact on gearing. tho not the same thing, it can be used as reference. I've been experimenting with this a bit myself lately. The crank may develop cracks, and break.