Ive got a Feather remote Kit with the extra module (sans remote shell, but there are STLs online), if youre interested. Its basically a juiced up version of the Firefly
Ditch the ultimate hangers in favour of infinity, much stronger.
From what you are describing you may not need 9" tyres. You can save a lot of weight by going with 8" and the mini gear drive.
If you go with 9“ than maybe better to use lower kV motors. Something between 130-150kV might be the right than.
Also which gearing ratio you plan to use?
Stiffness is an argument, but how much weight do I save, if I go with 8" Superstar instead of 9" Superstars? And for mini gear drive only the blue option is still available. The other two options are sold out.
1:4 or 1:5, because I plan to with a gear drive system. With 190kV and 9" tyres I go up to nearly 65 km/h and that is too much for me. 150kV will be more suitiable.
There are no superstar 9" hubs so you would have to go with 9" aluminium megastar hubs.
From Trampa’s website there seems to be more than 200g difference per hub.
Add to that the tyres and tube weight difference my guess is over 1.5kg in total between 8" and 9".
9" are nice, but like others said before with 8" and the mini drive with 1:5 gearing you have a lot of clearance as well and save a good amount of weight.