Sancho's Horse wrote:...I have a worksman, and I was going to replace the existing axle/wheels. I was thinking about using some 1 inch keyed axle stock which I have, and having it machined to accomodate their wheels. It sounds like it was from the force of the mid-drive, so, this is a go. I checked out the 1 inch freewheel options once before, but I will go back and review before ordering the extra pillow block bearings. ...
any axle from 5/8" to 3/4" will easily handle 5 horsepower over an unsupported length of a tricycle with a full axle if the applied force is properly supported. It's just that the tricycle tube axles aren't always made from the strongest materials or use adequate sealed bearings.
A 1" axle can handle lots lots more power.
What size axle does your Worksman have fitted? -as some of them come with 1" axles, 3/4" axles, 5/8" axles and that import thingy with a 15mm if I remember correctly (probably not)
The unsupported area between bearings, the number and type of bearings used all make a difference in the load/force handling capability of an axle, as is the material the axle is made of. (one of my more cornfuzing sentences too be sure)
I'm old skool engineering type relying mainly on "brute force" and "over spec'd" by very large margins if my personal rear end's liable to get damaged. I mainly take issue with the 15mm axles that have become the 'norm' on most the import trikes from Taiwan. I've done all sorts of silly stuff with a 5/8" axle but generally very close to the bearing supports