The 13t from a 6 speed can be used instead of the 12t on a 2 speed if that helps. That lowers standard gearing to 69 inches. For other sizes you'd need to dismantle a 9 spline Shimano cassette.
@bq 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.
The 13t from a 6 speed can be used instead of the 12t on a 2 speed if that helps. That lowers standard gearing to 69 inches.
For other sizes you'd need to dismantle a 9 spline Shimano cassette.