I'm not sure that pedaling to treat sciatica is a good solution ....
Well, it has been working on me for over 15 years !!
Even since, after me, the medicine for the usual back pain, discovered that one should not be stuck 3 months in bed with lots of harmful drugs (as I saw 20 years ago !!), but move immediately, and re-build your back to keep the vertebrae in place
even with weights (recent health magazine on A5) !!
Also, I have been building my back for 15 years with
this regular effort to climb an intense hill to 10% even with back pain, who once muscular is able to hold the vertebrae in place !! (done by bike or running up stairs)
It’s not riding flat tens of km on a bike, not at all the same
Sitting at a computer without stirring for a few weeks, my lower back is twisted and I lose my muscles, and my poorly maintained vertebrae, move and make my sciatica come back !!
And I re-muscle the back much straighter, and the back pain re-disappears !!
Sitting on a chair, your back is much more twisted than on a bike (unless you pedal like a handle on a too small bike, as I see some !!
Finally the lumbar contracted in a twisted position on a chair or car (the chair of my car is very bad for me to return my sciatica in 900Km) again straight on a bike, forced to maintain the thigh muscles to pedal relax and relax re-build muscle to cure my sciatica repeatedly !!
Watch the movements recommended for lower back pain, and you will see that you are doing them by bike and
especially you muscle a lot more than without this intense exercise !!