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-   -   rear wheel losing contact (https://www.bikeforums.net/33-road-bike-racing/415690-rear-wheel-losing-contact.html)

bad_mojo 05-07-08 04:28 PM

rear wheel losing contact
 
So lately I've had some issues with my rear wheel coming up off of the pavement. It had mostly been happening during practice when I would start in a super-high gear and start from 5 mph to 35mph without changing gears. Last night in a crit it happened in the final sprint. Admittedly I was probably starting in a gear too high but I couldn't get going because of the wheel thing. What is the deal? Am I trying to sprint too far forward? I've also been trying to use my upper body a bit more (pulling up on the bars).

El Diablo Rojo 05-07-08 04:30 PM

It's a weight distribution issue. You most likely leaning too far forward while out of the saddle. I used to have the same problem, I solved it by learning to sprint on rollers. Now I'm pretty centered on the bike and my rear wheel is in constant contact with the pavement.

Treefox 05-07-08 04:34 PM

Diablo's post is probably right on. Interesting problem though. I certainly pick up my front wheel when accelerating.

(apparently it looks suitably scary to others when gunning it at TT starts, having my front wheel bouncing around)

Apus^2 05-07-08 04:48 PM

+1 on the weight distribution. If you had a picture you would probably see your center of gravity farther in front of the bottom bracket than it should be. Work on your form and concentrate on sprinting with your thighs touching the sides of the saddle.

carpediemracing 05-07-08 04:49 PM


Originally Posted by Treefox (Post 6654445)
Diablo's post is probably right on. Interesting problem though. I certainly pick up my front wheel when accelerating.

(apparently it looks suitably scary to others when gunning it at TT starts, having my front wheel bouncing around)

+1 on moving your weight back. But don't forget how to break that rear wheel loose - doing it on sand makes for nice rooster tails. And a bit of chain cleaning when you get home.

+1 on lifting front tire. Steve Hegg, in training for the the 84 Olympic pursuit which he eventually won, was found to lift his front wheel for 1-1.5 revolutions at the start of the event. This on a 24" front wheel funny bike.

cdr

grolby 05-07-08 05:08 PM

Remember when you sprint to keep your butt from going too far forward. That both keeps the wheel down and keeps you in a good position to generate power.

I've had my rear wheel break free sprinting out of a corner onto an uphill in a crit. I usually move forward a bit on hills, and on the bell lap we were surging pretty hard. It was pretty cool, actually, I felt like such a beast (even though I'm not!). :D

Snuffleupagus 05-07-08 05:42 PM


Originally Posted by carpediemracing (Post 6654536)
+1 on moving your weight back. But don't forget how to break that rear wheel loose - doing it on sand makes for nice rooster tails. And a bit of chain cleaning when you get home.

+1 on lifting front tire. Steve Hegg, in training for the the 84 Olympic pursuit which he eventually won, was found to lift his front wheel for 1-1.5 revolutions at the start of the event. This on a 24" front wheel funny bike.

cdr

Which begs the question, can anyone do - with video evidence - a trackstand burnout? It's on my life list of things to be able to do :D Weight all the way forward, front brake locked up - and smoke emanating from the rear tire...

justinb 05-07-08 06:30 PM

Sounds like a recipe for OTB.

Snuffleupagus 05-07-08 06:34 PM


Originally Posted by justinb (Post 6655092)
Sounds like a recipe for OTB.

Not in a race, I'm talking about screwing around after a race - while quite possibly inebriated.

fix 05-07-08 06:34 PM


Originally Posted by Snuffleupagus (Post 6654831)
Which begs the question, can anyone do - with video evidence - a trackstand burnout? It's on my life list of things to be able to do :D Weight all the way forward, front brake locked up - and smoke emanating from the rear tire...

This is also on my list of things to do. It's a close second behind making best-of-craigslist.

slvoid 05-07-08 06:57 PM


Originally Posted by Snuffleupagus (Post 6654831)
Which begs the question, can anyone do - with video evidence - a trackstand burnout? It's on my life list of things to be able to do :D Weight all the way forward, front brake locked up - and smoke emanating from the rear tire...

http://video.google.com/videoplay?do...KDg_nFAQ&hl=en

close enough

mike9903 05-07-08 07:31 PM


Originally Posted by slvoid (Post 6655238)

That is AWESOME!!!!!:eek::eek:

Jynx 05-07-08 07:48 PM

Heres a video on what to do:

http://www.youtube.com/watch?v=z7qNAbcibZU

brians647 05-07-08 07:48 PM


Originally Posted by slvoid (Post 6655238)

Classic! And he didn't even get his robe caught in the wheels!

waterrockets 05-07-08 08:12 PM

Don't forget about pedaling form (I can't believe I'm first in with this):

If you are at max power and your form starts to suffer, you might be under power at the bottom of the stroke, when the pedal can't go down any more. This sends your body up, and that turns into a hop. You might just be doing it with your longer or stronger leg, so only once per revolution.

merlinextraligh 05-07-08 08:30 PM


Originally Posted by Snuffleupagus (Post 6654831)
Which begs the question, can anyone do - with video evidence - a trackstand burnout? It's on my life list of things to be able to do :D Weight all the way forward, front brake locked up - and smoke emanating from the rear tire...

give me a low enough gear and no problem.

We used to do this as kids all the time. The key is an extremely low gear. (Inverse of the reason why you start off in a car on ice in second gear.)

bad_mojo 05-07-08 08:39 PM


Originally Posted by waterrockets (Post 6655699)
Don't forget about pedaling form (I can't believe I'm first in with this):

If you are at max power and your form starts to suffer, you might be under power at the bottom of the stroke, when the pedal can't go down any more. This sends your body up, and that turns into a hop. You might just be doing it with your longer or stronger leg, so only once per revolution.

How do I tell if during a sprint its my form?

waterrockets 05-07-08 09:11 PM

In my experience, it is your form. Weight distribution can suppress the symptom, but if your body wasn't jumping, neither would your wheel.

VosBike 05-08-08 12:26 AM

snuff,
burnouts can indeed be drunk...I mean done.

1)almost(not quite) lock the front
2) low gear, like 39x25 or 23
3) try to do a wheelie with your front brake on and your weight front-wards
4)pedal just so fast. here's where the beers help.

slim_77 05-08-08 11:15 AM


Originally Posted by waterrockets (Post 6656153)
In my experience, it is your form. Weight distribution can suppress the symptom, but if your body wasn't jumping, neither would your wheel.

This has me thinking...I've had a few problems with this when I jump for a break or a sprint--'till I settle down and sit down and grind it out. I thought had it pinned to pulling up to hard on the pedal stroke and my weight shifted too far to the front while standing.

So, I should level out my upperbody and smooth out my stroke. Any tips for this? Thighs rubbing the saddle is an interesting one...any others?

Bnjmn 05-10-08 10:18 PM

I was lifting my rear tire a bit on sprints, and not b/c I can actually sprint.
Keeping my thighs near the saddle took care of the issue (thanks WR).
Another thing you may want to do is stay in the drops- it is hard to get into the wrong (too upright) position if you are in the drops + keeping your legs near the saddle. A side benefit is that you will be much lower and more compact = more aero and in control.
In any case- your sprinting position should be different than your out-of-saddle climbing position.

slim_77 05-11-08 05:39 AM

I've been practicing this, and looking for pics. It looks like pros lift their just their hips yet keep them behind the bb and almost directly over the saddle. I am just starting to work on sprints, so it will take some time to get comfortable, right now I feel terribly awkward in that position.


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