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55 mph on a flat!!!(15 posts)

55 mph on a flat!!!DT
Sep 15, 2001 5:34 PM
...behind a semi last Sunday! :o) My wife wasn't too happy with me when I told her. I held about 50 or so for about 3 miles, maybe a little longer, topping out at 55. I use a 54x11...not much use for it here in the flats of central-eastern Mississippi, unless you get on the back of a semi as it slows to cross railroad tracks :o)
re: 55 mph on a flat!!!Mike P.
Sep 15, 2001 5:57 PM
51 behind a cement truck just this morning. Didn't tell the girlfriend though.
re: 55 mph on a flat!!!gusriley
Sep 15, 2001 9:08 PM
Great speeds and fantastic distance!

When a bunch of us were stationed in Korea we were more than happy to hang behind a bus at 40 mph. But the fumes were sooo bad there was no way we could stay back there for more than about half a mile or less! Weirded out the Koreans when they saw us do that though!
Crazy fun eh?Ron B.
Sep 15, 2001 9:25 PM
That's an impressive speed for that amount of distance.

My best ever at following trucks is a 43 mph spring on a slight uphill behind a semi. I was able to keep it up for a little over a half mile.
oh yah..ChrisVedral
Sep 16, 2001 4:31 AM
well yesterday with the 26 mph winds on the last 5 miles home the wind was directly behind me and the speed limit ont he rode was 25 and i was doing 35 for 5 miles it was sweet...
how close were you? (nm)bsenez
Sep 16, 2001 7:52 AM
Holding at 3-5 feet. (nm)DT
Sep 16, 2001 9:02 AM
Gee, hope you were wearing your helmet.Dog Breath
Sep 16, 2001 10:39 AM
Not that it would help much in the event something went wrong.
(ie a sudden stop by the vehicle, or an unseen object/pothole)
Geez!Blue 'Goose
Sep 16, 2001 1:37 PM
Yesterday I was out for a short 20 miler and found a really steep hill (about 1.2 miles long however) and I was outracing traffic on the way down, hit 40+ mph or thereabouts at the peak and looked over. There was some guy driving an SUV and looked shocked out of his mind to see a bike passing him. Talk about a kodak

Yes, it would have been very bad if I'd dumped the bike, but that's the same hill I
did 62.5+ on back in 1987 when I was in peak shape and had a 25 mph tailwind
as a storm was coming in. I don't think I'd try for that kind of speed today now that
I'm in my late 30s.

Told the wife, I don't think she believed me! I did buy a new helmet today though......
don't believe it.Really?
Sep 17, 2001 6:35 AM
I'm not saying you are a liar, but 55 on a FLAT? Seems unlikely even with a semi draft...were you working with he sped up slowly? Even then you'd need a REALLY BIG GEAR to get that fast without a hill or unless you attatched a bungee cord to his bumper.,
Well, it happened...DT
Sep 17, 2001 8:34 AM
...and I even actually used my big ring, unlike the kid in the movie "Breaking Away" :o) Yes, it happened...he slowed down for a corner, then right after the corner he slowed even more to cross some railroad tracks, so I had a really good speed to start with. From there, it was just a matter of staying close (3-5 feet) while he accelerated...when there's no wind (hence the draft) it's pretty easy to stay with them if they accelerate slow enough. Also, I have a 54x11, left over from my days in the Appalachains. There you go! Next time, I'll take a pic of my max speed on the bike computer and post it along with the message :o)
The Mathgrzy
Sep 17, 2001 9:33 AM
55 mph is 80.67 feet per second or approx. 4800 feet per minute. One revolution of your crank @ 54/11 and using the approximation of 27" diameter wheel is 34.7 feet per crank revolution. Required cadence is then about 137 rev./min. - Which is in the realm of possibility. As long as total drag is less than total power available then you have a game. Life is faster through the eyes of a tandem. ;-)
refund! refund! refund!grassy knoll
Sep 17, 2001 10:56 AM
In breaking away Dave Stoller accomplished this feat in the small ring.
Can be done ...Humma Hah
Sep 17, 2001 3:54 PM
Let's see, "Mile-A-Minute Murphy" did better, I believe it was drafting a specially-equipped train on a stretch of tracks with a board bike-track.

One of the first Paramounts was a speed-record machine that drafted a race car with a large wind screen. It may have topped 100 -- I believe the tires melted.

The present drafting record is more like 160-something.

Its all about wind resistance. If you've got the gears and your legs can keep up, 50 is actually not that remarkable.

Crazy, maybe, but not remarkable.
Sep 17, 2001 5:04 PM
Hit 51 on Sunday coming down a hill:-) I was using my 53 x 12 and didn't quite top out (D*&m stop sign!), so 55 with a 54 x 11 is completely believable.