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@Oliver Schick
I've briefly done 37mph on the flat (with tailwind) and can be quite comfortable at 30/31mph for a couple of kilometres (without tailwind) if the road surface is good. Mostly, my cruising speed is between 20 and 25mph. I once had 67kph on my computer after going down Shooter's Hill eastbound. I'm a very nervous descender and don't normally let go down descents, but that day conditions were perfect--no side roads, no traffic, great weather, no wind, straight road, good surface conditions. All of the above on my geared road bike. On my fixed bike at 42/16 I probably don't manage to get far above 17-19mph (no computer on the bike), mostly because I can't spin very fast. I need big gears to go fast and sometimes feel under-geared on 52/12.