i am fixing up an old CYC stormer....when i measure with a ruler the seat post diameter it looks like 7/8". what are the size options for seat posts? i dont remember there being different sizes when i was a kid. thanks.

Probably 95% of old bmx bikes use 7/8" seatposts, while some of the old aluminum frames use 13/16" seatposts. I have a CYC Stormer and it is indeed a 7/8" post.

thank you.