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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
moment.

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 him....ie 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.
Yepper.look271
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.