(Edit) I think this could be right, I took apart a Regina, no rollers. I'd have to check but looking at the size I can see why there are no rollers. Not enough room.35 roller chain is rollerless chain unlike other ANSI standard roller chains which have rollers. PEER Chain provides ANSI/ASME standard roller chains from size ... This is straight from google and a continuation of an education which is why we have sites like this so we all learn a little something.