Looks promising, has anyone with experience ?
Gear Ratio Teeth equivalent for 28T
1st 1:1 28T (phisical chainring size)
2st 1:1,43 40T (phisical chainring size)
3st 1:1,79 50T (phisical chainring size)
They have Brompton version, Strida one needs modification on speed drive BB adapter.