Most likely there's only 0.6 mm difference, but enough to not hold the bars securely without the help of a shim.
@TheorySwine 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.
Most likely there's only 0.6 mm difference, but enough to not hold the bars securely without the help of a shim.