Can't identify the BB type

twilightdoor

I'm stuck with identifying the BB on this Giant acid i'm renovating. It looks internal as there are no external bearings, but when i removed the bolts in the cranks you can see straight through the bracket, ie there is a hollow middle. The pictures are quite difficult to see, but there is a splined ring inside the crank, with two sets of threads.

Chainset is FSA RPM, CK-560-1




Any help greatly appreciated.

stu8975

Googling the chainset would have given you the answer. Isis.