What is the best profile for a Sim Rig

What is the best profile for a Sim Rig

8020 Series Profiles are very confusing to many Sim Rig builders. But it's honestly easy to understand....
Metric Extrusion Profiles
  • 25 series is based on multiples of 25mm
    • 25mm * 25mm or 25mm *50mm, 50mm * 50mm, etc
    • T-Nut & bolt size 6mm
  • 40 series is based on multiples of 40mm
    • 40mm * 40mm or 40mm * 80mm, 80mm * 80mm, etc
    • T-Nut & bolt size 8mm
  • 45 series is based on multiples of 45mm
    • 45mm * 45mm or 45mm *90mm, etc
    • T-Nut & bolt size 8mm
Imperial Extrusion Profiles
  • 10 Series is based on multiples of 1"
    • 1" * 1" or 1" * 1 1/2" or 3" *  3", etc
    • T-Nut & Bolt size 1/4" or 6mm
  • 15 Series is based on multiples of 1 1/1"
    • 1 1/2 * 1 1/2" OR 1 1/2" * 3", etc 
    • T-Nut & bolt size 5/16" or 8mm
Many of the above series are also available in different wall thickness. So if you find a bargain price rig or extrusion check the wall thickness! Extra light has a very, very thin wall thickness.
If the rig is designed correctly and well braced like the Evo Supersport full bracing, you will experience almost zero flex even with OSW * HPP pedals. I own and use a 25 series rig and see no reason to go to the much thicker, heavier and more expensive profiles.
Good design choice of the appropriate size extrusion is critical, for example a triple monitor stand built totally for 10 series or 25 series can be very strong OR too light & flimsy depending on the section you choose! I would suggest 50mm * 50mm OR 2" * 2" builds a very good monitor stand, but 25mm * 25mm or 1" * 1" would build a very poor quality stand.