I have an old set of Araya rims. 27" alloy. The kind you saw on mid to low end bike boom rides. 27x 1/4. Slight rise in the center of the rim, but box for all intensive purposes. I think I had a set on my bridgestone 400, a set on an old Panasonic and I have seen them on some schwinns.

I wanna stop by my LBS this afternoon and pick up some spoke to build a coaster rear, I forgot to write down the model number of the rim to get the ERD.

I know this is a long shot, but does anyone know what model number this might be? Or better yet, the ERD. I wanna calculate the spoke length that I need.

Thanks.