I studied simrace seats for almost 3 years.
Good simrace seat must have the following options:
1. long seat base (you unload your legs)
2. long side suport seat base (we discovered that you must have support when you push your pedals with heel and toe and that you rotate your foot)
3. proper angle of seat base (you get the feeling, that your legs are levitating)
4. small thickness of sponge under your knees (what we discovered from praxis was that your brain must feel one fixed position on your legs, one point of your legs must be fixed so that you could push pedals)
5. posibility (an option) that you can extend your legs without moving up your knees (even in case that you are 200cm height)
6. properly set height diference (distance) betwen your seat base and pedal plate
7. posibility that you can change angle of your pedal (correct angle is VERY IMPORTANT for your foot)
8. strong support for your pedal plate without flexing it (when you push your pedals, you produce really big force)
9. free space between your legs under knees
10. properly set height and distance of wheel
You can see all of this on this pictures of Rinoseat:
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There you can see one bad example of position of sitting (bad seat construction):
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REVIEW OF RINOSEAT
...Excellent comfort, I'm so pleased to actually feel the legs after a 2,5 hour stint. The lower body position,or the more laying style of driving with the legs more strait forward made the trick. I could easily do longer stints, the comfortableness was never a question. It felt very practical to reach the buttons at the shifter. After the stints I could feel I was a little sweaty at my back and thighs.
The whole body get very good support from the seat, back, shoulder, neck, and head. Sitting this low I got my eyes a little below the middle of the monitor, to me it felt very good. I don't desire any extra table for the monitor...
http://www.lfsforum.net/showthread.php?t=38375
Thanks,
Renato M.
reno@rino.hr