Usual sizes are 1/4" ,3/16" and 5/32"(4mm).Very occasionally 5mm. You are best to measure one. Ebay is a good source for small quantities c 100. http://tinyurl.com/de4yun
@freezing77 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Usual sizes are 1/4" ,3/16" and 5/32"(4mm).Very occasionally 5mm. You are best to measure one. Ebay is a good source for small quantities c 100.
http://tinyurl.com/de4yun