On 08/01/18 09:31, Emanuel Berg wrote:

However having neither chainring or sprocket,
what impact does the bicycle trailer wheel size
has, and how does that work? Impact not on the
bike but in general, I mean?

[1] http://user.it.uu.se/~embe8573/work-...pertramp-1.jpg
http://user.it.uu.se/~embe8573/work-...oasen-wood.jpg


The smaller the wheel the less easily it will be to pull it over a hard
bump. Imagine the wheel was the same radius as a brick. If you pull
the trailer and the wheel strikes a brick it will not naturally lift up
and over the brick. Now imagine the wheel radius is many times that of
the height of the brick. If you pull the trailer and the bigger wheel
hits a brick it will naturally ride up and over the brick.

Bearing friction is hardly a factor.

"For pneumatic tires on hard pavement, it is reported that the effect of
diameter on rolling resistance is negligible (within a practical range
of diameters).[33][34]"

https://en.wikipedia.org/wiki/Rolling_resistance

--
JS