View Single Post
Old 2017-11-26, 07:50 AM   #4
Bridge of Otherwhere: on Kindle
Mikefule's Avatar
Join Date: May 2002
Location: Long Bennington, Lincolnshire, England.
Posts: 7,190
Originally Posted by harper View Post
In a simple epicyclic unicycle hub it is technically more difficult to run in reduced gear mode. I haven't given much thought to reduced gear operation with compound gearing and don't even know if it's possible. Compound gearing, however, is the only way to get increased gear ratios over 2.
The Sturmey Archer 3 speed had one set of sun and planet gears, and a sliding clutch to choose the input and output. That gave you direct drive in 2nd, with (direct plus a third) in 3rd and (direct minus a quarter) in 1st.

Closer ratio hubs were also available, but the "plus a third, minus a quarter" set up was at one time the most popular gearing solution for bicycles in the UK.
My first novel, Bridge of Otherwhere, Michael Wilkinson, on Kindle. A tale of subtle magic, mystery, friendship and love. For US$ page:
Mikefule is offline   Reply With Quote
Page generated in 0.06108 seconds with 9 queries