You certain they're 151bcd? Have they got a date stamp (sorry annoying geek question)? If they're seventies its a diamond with a number, eighties are a circle and number.
@Skülly 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.
You certain they're 151bcd? Have they got a date stamp (sorry annoying geek question)? If they're seventies its a diamond with a number, eighties are a circle and number.