Originally Posted by
CEBEP
They use Sturmey Archer hub on only one model, so are other suppliers in Asia. The rest of the models are cassette starting with 11t.
As said, I have a also Pacific Cycles Titanium Birdy that was delivered with a 11-28 11s cassette and 52-36 compact chainrings and it was too short. I modified it with a Hope RS4 XDR hub and 3T(Ethirteen made) 9-32 11s cassette.
This is the reason why I recommend you to first use your Birdy Touring as delivered with the Sunrace 9-32 cassette and then see what is good for you based on your own experience.