Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 31
  1. #1
    Senior Member snafu21's Avatar
    Join Date
    May 2008
    Location
    The Mangroves, UK
    My Bikes
    None.
    Posts
    1,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    70mph on a 16" folder... World Record?

    Keep your sprint bikes:

    "AS WORLD speed record attempts go, it's one of the more unlikely.
    That's because Yorkshire stuntman Rob Jarman won't be behind the controls of a high-powered car, superbike or speedboat.

    Instead, Rob, of Harrogate, will be pushing the pedals of a FOLDING BICYCLE."


    Ya. It's a Mezzo, natch. Full story here:
    - every mile of road has two miles of ditch -

  2. #2
    Senior Member Caaah's Avatar
    Join Date
    Mar 2008
    Location
    Brooklyn
    My Bikes
    2006 Dahon Hon Solo, 2007 Dahon Curve D3, 1979 Raleigh Grand Prix
    Posts
    151
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ew! Ow!

    "you can lose an inch of skin per second if you go down on dry tarmac."

  3. #3
    Senior Member neilfein's Avatar
    Join Date
    May 2007
    Location
    Highland Park, NJ, USA
    My Bikes
    "Hildy", a Novara Randonee touring bike; a 16-speed Bike Friday Tikit; Dahon Curve D3 folding bike; a green around-town cruiser; and a Specialized Stumpjumper frame-based built-up MTB.
    Posts
    3,778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I get nervous when I get near 20mph on my Curve. Good luck to him.
    Tour Journals, Blog, ride pix

    I'm in the celtic folk fusion band Baroque and Hungry. "Mended", our new full-length studio album, is now available for download.

  4. #4
    jur
    jur is offline
    Senior Member
    Join Date
    May 2005
    Posts
    6,224
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    I've been to 74 on my Downtube Mini. So that's faster.
    My folding bike photo essays www.dekter.net/

  5. #5
    Celebrate Diversity! JSnow789's Avatar
    Join Date
    May 2008
    Location
    Chicago or Orlando
    Posts
    42
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm happy cruising by the stopped traffic on my Strida at 10mph.


  6. #6
    Bicycling Gnome
    Join Date
    Apr 2006
    Location
    55.0N 1.59W
    Posts
    1,877
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jur View Post
    I've been to 74 on my Downtube Mini. So that's faster.
    Yeah but that was when it was in the back of your car. My TSR has did 87 mph on the way back from collecting it.


  7. #7
    The Legitimiser Sammyboy's Avatar
    Join Date
    Jul 2005
    Location
    Southampton, UK
    My Bikes
    Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
    Posts
    4,848
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hit 34 on my IXFS today, and given the gearing, I was spinning like a demon. Only gravity will get me faster than that!

  8. #8
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
    Join Date
    Sep 2004
    Location
    London UK
    My Bikes
    1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
    Posts
    1,956
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I topped out on a downhill on my Raleigh Twenty back in the SRAM 7 speed days at 41mph which was pretty special. What size chainring does that guy have?

  9. #9
    jur
    jur is offline
    Senior Member
    Join Date
    May 2005
    Posts
    6,224
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by EvilV View Post
    Yeah but that was when it was in the back of your car. My TSR has did 87 mph on the way back from collecting it.

    Oh wait. You guys are talking the furlong-fortnight-stone system. I was talking SI.

    87mph - how many furlongs per fortnight is that?
    My folding bike photo essays www.dekter.net/

  10. #10
    Senior Member alhedges's Avatar
    Join Date
    Mar 2008
    Location
    Naptown
    My Bikes
    NWT 24sp DD; Brompton M6R
    Posts
    1,133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jur View Post
    Oh wait. You guys are talking the furlong-fortnight-stone system. I was talking SI.

    87mph - how many furlongs per fortnight is that?
    Eleventy-one, assuming imperial furlongs and fortnights.

  11. #11
    in cog neato itsmoot's Avatar
    Join Date
    Mar 2008
    Location
    Missouri
    Posts
    350
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by LittlePixel View Post
    What size chainring does that guy have?
    At least a furlong and a half.

    Lose 1" of skin? More like 1/16" of skin, the remaining 15/16ths would be muscle and bone.

  12. #12
    Senior Member stevegor's Avatar
    Join Date
    Dec 2006
    Location
    Oz
    My Bikes
    lots... even a Raleigh twenty !!!
    Posts
    2,117
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    70 MPH??.....Phfftt, let me introduce..."THE WASP"

  13. #13
    Senior Member mrbrown's Avatar
    Join Date
    Jul 2007
    Location
    Singapore
    My Bikes
    Upgraded Scott Sub 20 in silver; Specialized Hardrock Comp Disc 2006 in limited edition Army green; Dahon Curve D3 foldable in white; Dahon MU P24 in blue.
    Posts
    342
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The fastest I ever did on my Curve was 42mph. Scared the **** out of me. Haha!
    Mercy overtakes
    even when you push fifty
    pedaling His paths


    My blog | My podcasts | My Flickr | My Rides

  14. #14
    Professional Fuss-Budget Bacciagalupe's Avatar
    Join Date
    Aug 2005
    Posts
    6,362
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    I hate to be a skeptic, but... I don't think this guy quite understands what's involved in going from 50mph to 70mph.

    In general, 40+ mph on a downhill is totally doable on just about any bike. Heck, even I've done it. So, let's say you are on a descent with a 10% grade, no wind, in the most aerodynamic position possible without using a recumbent. You can descend at 60mph with no effort -- assuming you can control the bike.

    However, under the same conditions, getting up to 70mph could require you to put out 1200 watts. FYI, that's ~300 watts more than David Millar or Christian Vande Velde's peaks, and 100 watts more than Magnus Backstedt's peak, during the TTT at this year's Giro. I.e. even going downhill on a 10% grade, he'd have to put out more power than some of the top competitive pros.

    Remember, drag does not increase in a linear fashion with speed, it increases exponentially. So the faster you go, you need to put out significantly more power to increase your speed.

    I'm sure he can get close to 50mph for brief periods on a properly kitted out Mezzo. And it is possible that he may break a record (especially since it doesn't sound like one has been set yet ). But even with the aero advantages of small wheels, and assuming the bike itself is tremendously aero (possible but not likely), unless he's got a rocket pack hidden in the bike, I don't see how he's going to hit 70.

  15. #15
    in cog neato itsmoot's Avatar
    Join Date
    Mar 2008
    Location
    Missouri
    Posts
    350
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    +1

    If this thread was in the recumbents forum they'd get a good laugh. Just a couple years ago the world speed record for a bicycle was just shy of 80mph in a streamliner (a 2-wheeled recumbent fully enclosed in an aerodynamic shell). Google "Fast Freddy Markham" or check out the video.

    Now back in the late 70s some guy rode a diamond frame bike BEHIND a souped-up truck that had a canopy that extended back around the rider. The canopy allowed him to easily draft the truck. IIRC the final speed record set was around 180mph. And LP, that time the crank was about the size of a large pizza pan.

    Around 50mph if he's on an unfaired upright bike with no trickery like drafting a high speed vehicle. Whos taking bets?
    Last edited by itsmoot; 06-19-08 at 10:00 PM.

  16. #16
    Senior Member snafu21's Avatar
    Join Date
    May 2008
    Location
    The Mangroves, UK
    My Bikes
    None.
    Posts
    1,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hit a 'massive' 24 mph for a moment on the Hammerhead yesterday. I was feeling kind of gloaty until I popped into the roadie thread and read of +30 mph averages... :-(
    - every mile of road has two miles of ditch -

  17. #17
    Senior Member Fear&Trembling's Avatar
    Join Date
    Oct 2005
    Location
    London
    Posts
    637
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    70mph will not happen unless he is drafting.

  18. #18
    Senior Member snafu21's Avatar
    Join Date
    May 2008
    Location
    The Mangroves, UK
    My Bikes
    None.
    Posts
    1,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Is this the same Rob "Ride like a b*st*rd" Jarman who rode an MTB down the ski slope/bobsleigh thing at Lillehammer?

    http://www.youtube.com/watch?v=FWW4TCltVYo

    Cripes!


    I don't see how he's going to get that Mezzo up to 70mph, unless he's powered by baked-Bean gas.

    But we should support him. Perhaps he'll come along to the next Hyde Park Meet, do a few stunts with his trousers on fire, then buy us all buns and coffee..
    Last edited by snafu21; 06-20-08 at 05:21 AM.
    - every mile of road has two miles of ditch -

  19. #19
    jur
    jur is offline
    Senior Member
    Join Date
    May 2005
    Posts
    6,224
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bacciagalupe View Post
    I hate to be a skeptic, but... I don't think this guy quite understands what's involved in going from 50mph to 70mph.......... But even with the aero advantages of small wheels, and assuming the bike itself is tremendously aero (possible but not likely), unless he's got a rocket pack hidden in the bike, I don't see how he's going to hit 70.
    +1

    The aeroness of the bike is small compared to the chunkiness of the rider. He will have to wear something unbelievably slippery and go down a long 20% slope. I got over 80km/h on my Swift in a bunch down a steep road. (The roadie bunch kept rather wide of me. )
    My folding bike photo essays www.dekter.net/

  20. #20
    rhm
    rhm is offline
    multimodal commuter rhm's Avatar
    Join Date
    Nov 2006
    Location
    NJ, NYC, LI
    My Bikes
    1945? Fothergill, 1948 Raleigh Record Ace, 1954 Drysdale, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1972 Fuji Finest, 1983 Trek 720, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
    Posts
    12,468
    Mentioned
    38 Post(s)
    Tagged
    1 Thread(s)
    I hit 30.4 mph on my Downtube Mini yesterday,coming down off a railroad overpass. And I hit 31.8 coming down off the Queensborough Bridge last week! That was my record on this bike, and I was pretty pleased with it. One of these days I'll find a real hill and top 35....

  21. #21
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
    Join Date
    Sep 2004
    Location
    London UK
    My Bikes
    1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
    Posts
    1,956
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jur View Post
    (The roadie bunch kept rather wide of me. )

    In case of dislodging hubcaps lol...

  22. #22
    Bicycling Gnome
    Join Date
    Apr 2006
    Location
    55.0N 1.59W
    Posts
    1,877
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by snafu21 View Post
    Is this the same Rob "Ride like a b*st*rd" Jarman who rode an MTB down the ski slope/bobsleigh thing at Lillehammer?

    http://www.youtube.com/watch?v=FWW4TCltVYo

    Cripes!


    I don't see how he's going to get that Mezzo up to 70mph, unless he's powered by baked-Bean gas.

    But we should support him. Perhaps he'll come along to the next Hyde Park Meet, do a few stunts with his trousers on fire, then buy us all buns and coffee..
    That's nothing - take a look at the feat of my brother here ->

    http://www.youtube.com/watch?v=YKRx1...eature=related

  23. #23
    Bicycling Gnome
    Join Date
    Apr 2006
    Location
    55.0N 1.59W
    Posts
    1,877
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    76 mph

    Quote Originally Posted by Bacciagalupe View Post
    I hate to be a skeptic, but... I don't think this guy quite understands what's involved in going from 50mph to 70mph.
    I think you are right. Even these guys in impeccably faired recumbant racing machines only get to about 76 mph - did I say only?

    http://www.youtube.com/watch?v=jUgXtZFdUcs&NR=1

  24. #24
    Bicycling Gnome
    Join Date
    Apr 2006
    Location
    55.0N 1.59W
    Posts
    1,877
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm tired of small wheels. I want one of these.

    http://www.youtube.com/watch?v=Ui4kI...eature=related

  25. #25
    Car free since 1995 pm124's Avatar
    Join Date
    Sep 2006
    Location
    NYC
    My Bikes
    Birdy Yellow, Birdy Monocoque
    Posts
    1,004
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've hit 30MPH on a flat (max, not an average) and 46MPH on a downhill. That's about 10MPH faster than I feel comfortable going. Suspended small wheeled bikes might be faster than large wheeled bikes under many conditions, but they are not as stable at high speeds. At 46, even the roadies around me were braking, but I'm sure they felt a bit more steady than I did.

    He should at least be riding a Moulton!

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •