e0richt said:well, on a real bike you set your saddle height by sitting on the bike, and putting your heel on the pedal. on the bottom position, your leg should be straight. if it isn't adjust until it is...
while pedaling the bike, you should put the ball of the foot onto the pedal.
Well it's a fairly simple way of looking at it but not a bad approximation. Start there are then see if it's comfortable. Your weight should be borne mostly on your sit bones and not on anything not designed to bear weight😉.
Best thing is to start easy, not ride for too long and gradually increase duration and resistance over time. It takes time for the body to adapt to new positions.
Not sure about the bike, is it like attached pic?
If so, you have a bit of adjustment choice. In terms of reach to the pedals, it is usually better to have the saddle slightly (i.e. a few mm) low than slightly high. If too high, you will probably find your hips/pelvis will rock side to side (not good) and hamstrings may become sore. If too low you can place a bit more stress on the knees (even though the total forces when pedalling aren't that great) but considering your injury it's why I recommend starting real easy. In terms of total reach to the pedals, you can also move saddle for/aft. If total leg reach to pedals is OK but you want to move the saddle back (say 10-15mm), you also should move it down a little (2-4mm). And vice versa....
As for the hands, again comfort is important - you shouldn't be bearing much weight on your hands - you should be able to ride and lift you hands off the bars without feeling like you are going to fall forward (if so bring the bars back/up). So consider adjusting the bar position accordingly.
[img]file:///C:/WINDOWS/TEMP/moz-screenshot-16.jpg[/img][img]file:///C:/WINDOWS/TEMP/moz-screenshot-17.jpg[/img]Here are some items about positioning in some detail:
cyclefitcentre.comfurther%20reading.htmOpen ↗
Good luck with it!