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


Go Back   > >

Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-08-06, 06:48 PM   #1
jiiiim
Noobhead
Thread Starter
 
jiiiim's Avatar
 
Join Date: Jul 2006
Location: SoCal
Bikes: k2 Zed 4.0
Posts: 688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Has anyone ever did a stoppie on a tandem?

I'm kinda interested cuz you need a powerful brake system to do so and keep it balanced in the air.
Pix would be nice. I tried yahooing and googling but nothing.
thanks!
jiiiim is offline   Reply With Quote
Old 10-08-06, 07:06 PM   #2
TandemGeek
hors category
 
TandemGeek's Avatar
 
Join Date: Jan 2002
Bikes:
Posts: 7,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jiiiim
I'm kinda interested cuz you need a powerful brake system to do so and keep it balanced in the air.
Pix would be nice. I tried yahooing and googling but nothing.
thanks!

There was a NWS video of Bobby Root clowning around on a tandem with a blow-up doll doing stoppies in San Franciso posted to the forums a while back. This is a link to the thread, but the link to the video is dead: http://www.bikeforums.net/showthread...ate#post999071

You can find it on MySpace by Googling on 'bobby root tandem'. It won't be the video that comes up in the main window, but it should be the 2nd or 3rd one in the more videos menu to the right and the title is Bobby Root Tandem.

As for doing a stoppie on a tandem, as Root demonstrates, it's not all that hard to do without a stoker... in fact, it's easier to do on a tandem than a motorcycle or a solo bike because of the long wheelbase. As for doing it with a stoker, the juice wouldn't be worth the squeeze: too much risk of having the bike jack-knife. Case in point, we've done an endo on our off-road tandem and it ain't pretty or fun.
TandemGeek is offline   Reply With Quote
Old 10-08-06, 11:05 PM   #3
jiiiim
Noobhead
Thread Starter
 
jiiiim's Avatar
 
Join Date: Jul 2006
Location: SoCal
Bikes: k2 Zed 4.0
Posts: 688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
that's awesome
but i wanna see two people not blow up doll =P
i wanna see which brake system it takes to endo a 300lb tandem
jiiiim is offline   Reply With Quote
Old 10-08-06, 11:31 PM   #4
zzzwillzzz
shut up and ride
 
Join Date: Nov 2005
Location: noho
Bikes: supersix hi-mod,burley duet tandem,woodrup track,cannondale cross,specialized road
Posts: 1,947
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
i don't think that the brake is the problem. it's having enough front wheel traction. the front wheel will skid well before you will be able to get the rear wheel in the air.
zzzwillzzz is offline   Reply With Quote
Old 10-09-06, 12:51 AM   #5
Dr.Deltron
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
Jiiiiiim, stay in school!!!
The title of this thread made me LOL!!!!!

And you might also learn the effects of gravity, co-efficient of friction, etc, that would imply that yes, you will probably skid before you accomplish a "stoppie"!!

  Reply With Quote
Old 10-09-06, 01:05 AM   #6
jiiiim
Noobhead
Thread Starter
 
jiiiim's Avatar
 
Join Date: Jul 2006
Location: SoCal
Bikes: k2 Zed 4.0
Posts: 688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well that is also why i'm interested in seeing a tandem stoppie
i searched so many engines for tandem stoppie videos/pic but none came up
jiiiim is offline   Reply With Quote
Old 10-09-06, 01:12 AM   #7
Dr.Deltron
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
I'm only guessing here, but if you DID use a strong brake AND had the front tire somewhat underinflated for traction, you would probably BREAK THE FORKS!
DO let us know if you ever find a vid, we'd love to see it!
  Reply With Quote
Old 10-09-06, 02:12 AM   #8
jiiiim
Noobhead
Thread Starter
 
jiiiim's Avatar
 
Join Date: Jul 2006
Location: SoCal
Bikes: k2 Zed 4.0
Posts: 688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
that is why you use big double crown fork =P
i was hoping for someone here that can possibly show me
but i'll still check here once awhile for updates and i shall continue my quest to search for a vid of a fully loaded tandem doing a stoppie!
jiiiim is offline   Reply With Quote
Old 10-09-06, 05:58 AM   #9
TandemGeek
hors category
 
TandemGeek's Avatar
 
Join Date: Jan 2002
Bikes:
Posts: 7,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Dr.Deltron
I'm only guessing here, but if you DID use a strong brake AND had the front tire somewhat underinflated for traction, you would probably BREAK THE FORKS!
You want to run the physics by me on this one... In other words, how would doing a stoppie put a greater load on a fork/wheel/headtube than it would during any other maximum effort braking event on a tandem where the rear wheel was merely unweighted to the point of loosing traction (skidding a rear wheel on a tandem under maximum braking is quite common, hence the earlier caution regarding jack-knifing) and not lifted for dramatic effect?

For context, lets presuppose that to achieve the stoppied one must assume the stoker would be of small stature / light weight. Therefore, unless the captain were larger than average, the total team weight of the stunt team would most likely be well under some of the common team weights of very large adult tandem teams, e.g., >400 - 450lbs who continuously subject their forks to massive stopping loads without incident over many years.
TandemGeek is offline   Reply With Quote
Old 10-09-06, 09:24 AM   #10
Dr.Deltron
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
It was just a guess. Try it and let us know if it works.
And don't forget to video tape it for Jiiiiiim!
  Reply With Quote
Old 10-10-06, 10:12 AM   #11
Jinker
Senior Member
 
Jinker's Avatar
 
Join Date: Nov 2005
Location: Ottawa,ON
Bikes: Univega Via Montega, Nashbar Aluminum frame/105 roadbike
Posts: 642
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you have insufficient traction on dry ground to lift the rear tire, in theory, doing it down a steep hill should 'help' (bringing the point directly beneath the CofG closer to the front wheel).

Seems like a really bad idea, IMO. Screwing up a stoppie on a single means a fall of what, 3 feet? The stoker could be lofted quite high before coming down...
Jinker is offline   Reply With Quote
Old 10-10-06, 02:07 PM   #12
merlinextraligh
pan y agua
 
merlinextraligh's Avatar
 
Join Date: Aug 2005
Location: Jacksonville
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
Posts: 29,113
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Quote:
Originally Posted by Jinker
Seems like a really bad idea, IMO. Screwing up a stoppie on a single means a fall of what, 3 feet? The stoker could be lofted quite high before coming down...
Make sure the stoker's clipped in to avoid the catapult effect.
merlinextraligh is offline   Reply With Quote
Old 10-10-06, 02:31 PM   #13
stapfam
Time for a change.
 
stapfam's Avatar
 
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
Posts: 19,915
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Jinker
If you have insufficient traction on dry ground to lift the rear tire, in theory, doing it down a steep hill should 'help' (bringing the point directly beneath the CofG closer to the front wheel).

Seems like a really bad idea, IMO. Screwing up a stoppie on a single means a fall of what, 3 feet? The stoker could be lofted quite high before coming down...

I have got some powerfull Brakes on our Tandem. Hope M4's with 200 mm disc's. Soon after we got them- The pilot decided to see how well they worked- On the road with slicks and after a fast downhill at 40mph and he Yanked the brakes on. I saw daylight under the rear wheel for about 6" and luckily he felt the same as I did and released the front brake pretty quick. The problem was me starting to over take the pilot. It just skewed round and there was no way he could have kept it in line.

As to forks- Triple crown boxers so pretty strong and not much fear of bending them. What did hurt though was the butt as when the rear wheel landed- The suspension post bottomed and so did I.

Edit--Couple of years ago heard of a Tandem offroad doing an endo-Front wheel buckled when it hit a deep hole and front end just stopped. Stoker went straight over the top and landed 20Ft in front of the bike- She was bruised and sore but the pilot broke a collarbone when he hit the ground and the Tandem hit him.
__________________
How long was I in the army? Five foot seven.


Spike Milligan

Last edited by stapfam; 10-12-06 at 03:13 PM.
stapfam is offline   Reply With Quote
Old 10-12-06, 11:48 PM   #14
prairie*boy
Senior Member
 
Join Date: Mar 2005
Bikes:
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good brakes, Strong Fork, Light (Fearless) Stoker is the magic combination. My KHS Tandemania is set up with a DJ1 fork, Magura Gustav M Disc brakes and with my 8 year old son as stoker, we have done many a stoppie (get the rear wheel about 2 feet into the air). Unfortunately, we couldn't get my wife to take pictures (she came out with the camera, saw what we were doing and went back inside).

Biggest challenge as Stapfam indicates is bringing the wheel back down under control, so the stoker isn't walking funny afterwards.
prairie*boy is offline   Reply With Quote
Old 10-25-06, 08:44 PM   #15
ROJA
Pepperoni Power
 
ROJA's Avatar
 
Join Date: Sep 2005
Location: Oaklandish
Bikes:
Posts: 1,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This I gotta see...
Definitely post the videos!
ROJA 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 09:32 AM.