54 mph on Hwy 113 near Devil's Lake state park. I drafted a minivan down the hill on my roadbike with 700-23 tires on it. Not the smartest thing I've ever done on a bike, but I came out of it without a crash. I regularly top 40 mph in western Dane County. I start to get uncomfortable around 45 mph.

48+ mph, years ago on our tandem, downhill of course. It was fun, but there aren't that many long & steep enough hills around here for that to happen often.

36.6mph so far, going into the Don Valley off of Cosburn. Have yet to hit up the big hills in the city, and I'm rolling with the knobbies right now (though slowly convincing myself to ditch them again).

34.2mph. My commute is totally flat.

Al

41 mph. Tour for Heroes in Aledo, TX. Long straight downhill- I could tell it would be an opportunity for a new personal best.

43.9 on the Pacific Coast Highway just outside of San Luis Obispo. My touring bike is not made for that. Nor are my nerves. I was inspired to go really fast because one of those radar signs that posts your speed was set up. I was going 37 when it caught me, so I dialed up the wattage to see how far I could push things. Of course, 50 miles into my day without having eaten properly, this was definitely not the time to stretch my limits. The whole time I kept thinking to myself, "This would be a perfect time to not *^(% up." It worked out fine in the end, but I'd hate to know my wife had to come identify a smear on the highway just because of some hair brained idea to push the bike and myself past our respective capacities.

57 on a slick tired mountain bike.

54 on my road bike.

48 off road.

I have only been riding for about a month now and I am still slow, I just set a new record of 32.5 mph the other day on my MTB with knobbies. Average commute speed is only about 11.2 mph

40 mph on a slick tired MTB. Ran out of gear to push.

I don't know if it was my fastest, but we were going about 40 mph coming down from the mountains above Aspen on a very windy road with an obscene amount of traffic and little shoulder. Oh, and there was a cliff on the other side

Come to think of it, that probably wasn't my fastest, but it was definitely the scariest.

Man I'm slow. My top speed is high 30's, 36-38 (it's been a while). I can get into the low 30's easily in two places on my commute (one each way). I think I could hit a new high coming down Ridge Ave on the way to work, except there's always been too much traffic (at rush hour it normally backs up most of the way up the hill).

Going down steep hills helps a lot with top speed. I can do high 20s for short distances on perfectly flat ground pedalling for all I'm worth but I can't maintain that speed for very long. I can do low 20s on flat ground and maintain that for 5-6 miles with no wind. I don't think I've ever reached 30mph on the flats but then I'm more of a distance rider so I've never actually tried. I have a nice long straight downhill run on my commute that I like to pedal pretty hard and keep my speed at about 33-35mph. The hill isn't very steep so I actually have to get my heartrate up to keep that pace. It's part of my commute that I really enjoy.

Exactly, all hail long, steep, gradients!
On the flats, when I was 19 with my Al Cannondale, I could get up to about 32 and my heart would explode. Now, on my Salsa, all out I'm good for the mid 20's, but cruise at ~18.

55 mph down the north side of the Timmelsjoch in Austria

43 miles an hour on a winding,(too winding it seems), downhill. Too winding because crashing at 43 sux.

60mph didnt think it was scary at all it was nothing but fun. i actually hit that speed every time i ride it is on my normal route.

On a flat for 3.2 miles - 36.2 mph
On a down hill run 48.4 mph
Commute Average speed between 24 to 30 MPH

Double 38's downhill on last October's Hilly Hundred: 38mph Saturday on my Rans Tailwind and 38mph on Sunday on our KHS tandem with my wife as a little bit of ballast.

https://www.kreuzotter.de says that 36.2 mph in the drops on a road bike takes ~850 watts... about double the 5-min power output of a world class 60kg pro cyclist.




EDIT - 36.2 on the flat is well within the realm of possibility given an excellent draft (behind a vehicle?) or a fantastic tailwind.

35mph on the street coming down a hill. probally would have tried for faster if it hadnt of been so freaking cold outside. Some of the trails around here i can hit in high 20's on the downhill section. Commute to work this morning top speed was around 25 lowest speed was around 6 up a hill. Alabama is crazy there is hills and elevation changes everywere. On one good flat section on the way to work which only last about a mile i can average 15mph. I need a new bike though. At 30+mph this one feels like its gonna fly apart

41 miles an hour on my unloaded touring bike. Descending from Timberline Lodge on Mt Hood to Government Camp (Oregon). 2000 foot elevation change in 6 miles. I chickened out at 41 and started cycling the brakes.

...

30+ mph descending 59th St bridge, Queens bound, south outer roadway, Ross Mt Hood. Didn't have the luxury of a 7/24 bike lane in the 80s, had to cross with the cars. Those were the days.

More recently, 50 mph, Bear Mountain, Trek 5200.

Faster than the cabs on lower Broadway, Centurion Trac.

John Howards' speed was just OK. 152 MPH, I have handled that bike and still have some salt that was scraped off of it after the run. Yet over 10 years later he helped a man go 14 MPH faster, 167 MPH. Same deal, on the salt, drafting a Bonneville streamliner.

Myself ~26 on the flat, 45 downhill on a loaded touring bike, and 70 MPH down a Colorado hill in a faired recumbent.

I got 39.9 the other day on a 46x14 vintage dawes Galaxy, couldn't pedal any faster. I just worked that out to be 139 rpm