You are reading a single comment by @BringMeMyFix and its replies.
Click here to read the full conversation.
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.
@BringMeMyFix
48x16 is 81" in trackspeak i.e. the old 27" (chainring/sprocket x 27) system.
Generally trackies who race at Herne Hill will mention 86" (48x15), 88" (49x15), 90" (50x15 or 47x14), and 92" 48x14, plus maybe a bit of 46x14 (88", but closer to 89").
I'm using 81" for the Sunday advanced sessions this month (cold/transitional/legspeed), so it'll be fine for the induction - you spend a lot of time doing less than 20mph. On a good day, you'd hope to hit ~37.5mph in that gear (160rpm)... but not for long :D