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Old 11-29-2011, 10:00 PM   #1
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What causes this?


. So being new to riding compared to almost everyone on this Forum, and never having had to lean my bike this far, MH if I may pick your brain, What causes the wobble in the turns? That guy's channel has a lot of bike riders wiping out from that same effect.

PS. if the video doesn't embed I may just have to post a link.
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Old 11-29-2011, 10:12 PM   #2
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It could be one or more causes. Cold tires, slick pavement or any other reason for reduced traction.
Whats happening is the rider is adding throttle while leaned over. The tire has a smaller contact patch when leaning and the added throttle combined with whatever other causes is making the rear tire spin.
That if allowed to go too far will cause a low side. The rear of the bike just slides out and down you go.
If the rear steps out and the rider chops the throttle, the rear tire can suddenly grab and this can cause a high side. It launches the rider up in the air.
To directly answer your question...
the riders are adding more throttle than the rear tire can handle under the given conditions.
The way to avoid it is to learn your limitations, the bike/tires limitations and don't ride on the street like your are on a racetrack.

This is where trackdays can be beneficial. Since a track is essentially a twisty road that comes back on itself, you are riding the same set of corners over and over. That gives you a chance to experiment with throttle, lean angles, corner entry speed, body position, etc. in a safe environment. With teachers watching what you do...
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Old 11-29-2011, 10:13 PM   #3
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Get over the fact that people call it a "racetrack". On a trackday it's just a twisty road where all the traffic is bikes and they are going the same direction.
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Old 11-29-2011, 10:19 PM   #4
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As many people have trouble in that corner that he "just happens to be set up at" makes me wonder if the pavement isn't touched up for his videos... seems a bit overly slick.
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Old 11-29-2011, 10:26 PM   #5
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I was thinking what kind of vulture sets up and watches bike after bike, car after car come through a slick corner and just films it for his own amusement?
I would be more inclined to warn people to slow down. At the very least I would leave rather than wait for somebody to get hurt while I watched and filmed.
It's like setting up by a wet floor to see if people fall and hurt themselves.
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Old 11-29-2011, 10:37 PM   #6
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Old 11-29-2011, 11:28 PM   #7
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Quote:
Originally Posted by bumblebee View Post
I was thinking what kind of vulture sets up and watches bike after bike, car after car come through a slick corner and just films it for his own amusement?
I would be more inclined to warn people to slow down. At the very least I would leave rather than wait for somebody to get hurt while I watched and filmed.
It's like setting up by a wet floor to see if people fall and hurt themselves.
The guy also has lots of video of people playing the weekend hero. I'm sure they appreciate being recorded.
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Old 11-29-2011, 11:38 PM   #8
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It seems like every one of those slips was right after that black patch. Maybe something on the pavement like anti-freeze or a decreasing radius in the turn.


*edit*
just finished the video,

at 1:50 you can see the close up of the guys R6 bouncing the rear coming off that black patch.

Last edited by StewRat; 11-29-2011 at 11:41 PM.
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Old 11-29-2011, 11:59 PM   #9
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....dunno what, but it does seem that it's the same general spot over and over. That in itself leads one to believe it's more than just driver/rider error.


Could be residue, change in surface texture etc....
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Old 11-30-2011, 12:16 AM   #10
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from watching that video i would say someone has done something to the road,

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Old 11-30-2011, 12:33 AM   #11
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Quote:
Originally Posted by StewRat View Post
It seems like every one of those slips was right after that black patch. Maybe something on the pavement like anti-freeze or a decreasing radius in the turn.


*edit*
just finished the video,

at 1:50 you can see the close up of the guys R6 bouncing the rear coming off that black patch.
I think you might have something there. When you watch the slow motion videos you can also see the front end chatter on all the bikes. Maybe there are some serious ripples in the payment we can't see on the video.
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Old 11-30-2011, 01:37 AM   #12
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holy that truck @ 2:53 almost takes out that biker
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Old 11-30-2011, 07:23 AM   #13
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Those guys from the UK that are boobytrapping the roads took a vacation to california. But yeah it looks like oil or something on the road there.
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Old 11-30-2011, 07:59 AM   #14
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Theres nothing wrong with the road there unless theres some dirt on it. Theres so many videos of people wrecking in the same spot all the time for so long i dont see how a person could say that its boobytrapped 24/7. Thats a load of . There are a few other threads about this already, it boils down to a few factors, mostly rider error.

Could be tire pressures too high/low, too much throttle making the tire spin off traction or anything. One of them looks like he just freaked out when his knee made contact and twitched the throttle around. Some of their lines are just totally messed up too so alot of them are probably riding too fast or outside their limits. It's just a matter of seat time to become a safe, consistent rider, you'll never stop learning.
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Old 11-30-2011, 08:39 AM   #15
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You should watch/read Twist of the Wrist, it'll help you understand....
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Old 11-30-2011, 09:00 AM   #16
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don't think its boobytrapped, just think there's a slick spot right in the area most people star to accel.
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Old 11-30-2011, 09:24 AM   #17
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Quote:
Theres nothing wrong with the road there unless theres some dirt on it. Theres so many videos of people wrecking in the same spot all the time for so long i dont see how a person could say that its boobytrapped 24/7. Thats a load of . There are a few other threads about this already, it boils down to a few factors, mostly rider error.

Could be tire pressures too high/low, too much throttle making the tire spin off traction or anything. One of them looks like he just freaked out when his knee made contact and twitched the throttle around. Some of their lines are just totally messed up too so alot of them are probably riding too fast or outside their limits. It's just a matter of seat time to become a safe, consistent rider, you'll never stop learning.
It doesn't need be boobytrapped, but the incidents are too consistent and in the same 'spot' to be merely a rider 'error'. Different speeds, lines etc...yet w/o fail there's a 'hitch' for every one of them.

without going out there, riding it and looking at it by one's self...it's impossible to know the actual 'cause'.
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Old 11-30-2011, 07:42 PM   #18
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Yea, Re-viewing these videos it seems to be a spot in that road, If you check out that guy's youtube channel he has a bunch of High Side crashes in that spot.

Btw, Watch at 38 seconds, Imagine that with out a helmet..
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Old 11-30-2011, 11:42 PM   #19
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Old 12-01-2011, 01:01 AM   #20
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From what I can hear and see a lot of those bikes have the same thing happen at just about the same point in the turn.

Peg scrape, jerk, wobble.

Rider error?

I'm no expert but I'm not above standing in for one when needed.
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