Here at Unicycle.com we are the unicycle specialists, so of course we support the building and maintenance of unicycle. We have built in to our website a tool that allows you to work out the length of the spokes you need to build your unicycle or penny farthing.
The spoke calculator has built in a drop down menu to allow you to select the hub and rims. Should you wish to work out a spoke length for a rim or hub that is not on the drop down menu you can just type in the figures.
Within the spoke calculator is a mini FAQ on how to measure spokes, hubs and rims.