Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-19-08, 12:39 PM   #1
snafu21
Senior Member
Thread Starter
 
snafu21's Avatar
 
Join Date: May 2008
Location: The Mangroves, UK
Bikes: None.
Posts: 1,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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:
snafu21 is offline   Reply With Quote
Old 06-19-08, 01:44 PM   #2
Caaah
Senior Member
 
Caaah's Avatar
 
Join Date: Mar 2008
Location: Brooklyn
Bikes: 2006 Dahon Hon Solo, 2007 Dahon Curve D3, 1979 Raleigh Grand Prix
Posts: 151
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ew! Ow!

"you can lose an inch of skin per second if you go down on dry tarmac."
Caaah is offline   Reply With Quote
Old 06-19-08, 02:10 PM   #3
neilfein
Senior Member
 
neilfein's Avatar
 
Join Date: May 2007
Location: Highland Park, NJ, USA
Bikes: "Hildy", a Novara Randonee touring bike; a 16-speed Bike Friday Tikit; and a Specialized Stumpjumper frame-based built-up MTB, now serving as the kid-carrier, grocery-getter.
Posts: 3,781
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.

Artistic Differences - 8-track EP Dreams of Bile and Blood now available for download.
neilfein is offline   Reply With Quote
Old 06-19-08, 02:49 PM   #4
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,806
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
I've been to 74 on my Downtube Mini. So that's faster.
jur is offline   Reply With Quote
Old 06-19-08, 02:50 PM   #5
JSnow789
Celebrate Diversity!
 
JSnow789's Avatar
 
Join Date: May 2008
Location: Chicago or Orlando
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm happy cruising by the stopped traffic on my Strida at 10mph.

JSnow789 is offline   Reply With Quote
Old 06-19-08, 02:58 PM   #6
EvilV
Bicycling Gnome
 
Join Date: Apr 2006
Location: 55.0N 1.59W
Bikes:
Posts: 1,877
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.

EvilV is offline   Reply With Quote
Old 06-19-08, 03:06 PM   #7
Sammyboy
The Legitimiser
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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!
Sammyboy is offline   Reply With Quote
Old 06-19-08, 05:00 PM   #8
LittlePixel
Raleigh20 PugFixie, Merc
 
LittlePixel's Avatar
 
Join Date: Sep 2004
Location: London UK
Bikes: 1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
Posts: 1,982
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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?
LittlePixel is offline   Reply With Quote
Old 06-19-08, 05:16 PM   #9
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,806
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(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?
jur is offline   Reply With Quote
Old 06-19-08, 05:44 PM   #10
alhedges
Senior Member
 
alhedges's Avatar
 
Join Date: Mar 2008
Location: Naptown
Bikes: NWT 24sp DD; Brompton M6R
Posts: 1,133
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
alhedges is offline   Reply With Quote
Old 06-19-08, 07:19 PM   #11
itsmoot
in cog neato
 
itsmoot's Avatar
 
Join Date: Mar 2008
Location: Missouri
Bikes:
Posts: 357
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
itsmoot is offline   Reply With Quote
Old 06-19-08, 08:25 PM   #12
stevegor
Senior Member
 
stevegor's Avatar
 
Join Date: Dec 2006
Location: Oz
Bikes: lots... even a Raleigh twenty !!!
Posts: 2,117
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
70 MPH??.....Phfftt, let me introduce..."THE WASP"
stevegor is offline   Reply With Quote
Old 06-19-08, 08:43 PM   #13
mrbrown
Senior Member
 
mrbrown's Avatar
 
Join Date: Jul 2007
Location: Singapore
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)
Quoted: 0 Post(s)
The fastest I ever did on my Curve was 42mph. Scared the **** out of me. Haha!
mrbrown is offline   Reply With Quote
Old 06-19-08, 09:00 PM   #14
Bacciagalupe
Professional Fuss-Budget
 
Bacciagalupe's Avatar
 
Join Date: Aug 2005
Bikes:
Posts: 6,438
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Bacciagalupe is offline   Reply With Quote
Old 06-19-08, 09:42 PM   #15
itsmoot
in cog neato
 
itsmoot's Avatar
 
Join Date: Mar 2008
Location: Missouri
Bikes:
Posts: 357
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
itsmoot is offline   Reply With Quote
Old 06-20-08, 12:28 AM   #16
snafu21
Senior Member
Thread Starter
 
snafu21's Avatar
 
Join Date: May 2008
Location: The Mangroves, UK
Bikes: None.
Posts: 1,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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... :-(
snafu21 is offline   Reply With Quote
Old 06-20-08, 03:20 AM   #17
Fear&Trembling
Senior Member
 
Fear&Trembling's Avatar
 
Join Date: Oct 2005
Location: London
Bikes:
Posts: 637
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
70mph will not happen unless he is drafting.
Fear&Trembling is offline   Reply With Quote
Old 06-20-08, 05:18 AM   #18
snafu21
Senior Member
Thread Starter
 
snafu21's Avatar
 
Join Date: May 2008
Location: The Mangroves, UK
Bikes: None.
Posts: 1,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
snafu21 is offline   Reply With Quote
Old 06-20-08, 06:36 AM   #19
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,806
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(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. )
jur is offline   Reply With Quote
Old 06-20-08, 07:59 AM   #20
rhm
multimodal commuter
 
rhm's Avatar
 
Join Date: Nov 2006
Location: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
Posts: 15,647
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(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....
rhm is online now   Reply With Quote
Old 06-20-08, 09:01 AM   #21
LittlePixel
Raleigh20 PugFixie, Merc
 
LittlePixel's Avatar
 
Join Date: Sep 2004
Location: London UK
Bikes: 1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
Posts: 1,982
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jur View Post
(The roadie bunch kept rather wide of me. )

In case of dislodging hubcaps lol...
LittlePixel is offline   Reply With Quote
Old 06-21-08, 07:42 AM   #22
EvilV
Bicycling Gnome
 
Join Date: Apr 2006
Location: 55.0N 1.59W
Bikes:
Posts: 1,877
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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
EvilV is offline   Reply With Quote
Old 06-21-08, 07:47 AM   #23
EvilV
Bicycling Gnome
 
Join Date: Apr 2006
Location: 55.0N 1.59W
Bikes:
Posts: 1,877
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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
EvilV is offline   Reply With Quote
Old 06-21-08, 07:53 AM   #24
EvilV
Bicycling Gnome
 
Join Date: Apr 2006
Location: 55.0N 1.59W
Bikes:
Posts: 1,877
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm tired of small wheels. I want one of these.

http://www.youtube.com/watch?v=Ui4kI...eature=related
EvilV is offline   Reply With Quote
Old 06-21-08, 11:05 AM   #25
pm124
Car free since 1995
 
pm124's Avatar
 
Join Date: Sep 2006
Location: NYC
Bikes: Birdy Yellow, Birdy Monocoque
Posts: 1,018
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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!
pm124 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:27 PM.