Singlespeed rigid/rigid frame advice

[rrrrxx]

Is a common hub, with a lot of spacer.Using a 13T shimano tooth.
The "derailleur" is LitePro Single Speed Chain Tensioner.
I mod the tail hook drill a hole for the spring.
you can see how it install.

[rrrrxx]

Nice bike rrrrxx ! It must be light.
What kind of mono-speed "derailleur" is this?

The "derailleur" is LitePro Single Speed Chain Tensioner.

[rrrrxx]

Beautiful, Can you please tell us more about your choosing components, is that 29" wheels? which hub did you use for a single speed?

It is 29" wheels and see above