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Old 06-07-2007, 10:21 PM   #1
HOUSTONSR6
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Dynamics of the 'Highsider'

You might already know this but its still a good read.


http://www.robspeed.com/highside.htm
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Old 06-08-2007, 01:50 AM   #2
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gives me chills. been there twice =(
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Old 06-08-2007, 05:06 AM   #3
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good info
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Old 06-08-2007, 06:23 AM   #4
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The majority of highsides happen on the gas while exiting a turn. Excessive throttle causes the back end to lose traction and it starts to slide, unloading the suspension (this is different than spinning the tire coming out of a turn). The rider chops the throttle quickly and the back end hooks up. At this point the conservation of angular momentum causes the bike to flip and spit the rider off in front of the bike.

That said, you can highside on a straight road if you lock up the back brake, let the rear end step out a bit, and then release the brake. Try it and see how it feels. I personally don't think that there is enough time to "chose to lay it down" as the author suggests. Highsides are violent and they happen so fast all you can do is hang on and hope that you don't crash and then, if you do crash, hope the bike goes somewhere else.
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Old 06-08-2007, 07:58 AM   #5
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^^there is enough time in some cases. My first wreck was when a car pulled out in front of me. I locked up the rear and it started to come around. Being new to riding at that point, I was happy that i remembered MSF and DIDNT LET OFF THE REAR BRAKE! So, the bike is sliding at the rear of the car in front of me...kinda sideways. I made the choice to open up the bar and drop the bike rather than continue to fight it and plow into the back of the car.
Ill take a "gentle" slide and roll over slamming into the back of a car anyday.
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Old 06-08-2007, 08:05 AM   #6
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[QUOTE=mhutch]The majority of highsides happen on the gas while exiting a turn. Excessive throttle causes the back end to lose traction and it starts to slide, unloading the suspension (this is different than spinning the tire coming out of a turn). The rider chops the throttle quickly and the back end hooks up. At this point the conservation of angular momentum causes the bike to flip and spit the rider off in front of the bike.QUOTE]

This is waht happened to me at MSR-H coming out of the Diamonds Edge in the rain. All I remember is my chest slamming against the top of the tank and my legs flying everywhere. I just held on for dear life and didn't grap a handful of front break. Somehow I rode it out and kept the bike upright! I was one of the scariest things I have ever experienced on a bike!
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Old 06-09-2007, 07:55 AM   #7
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Been there, done that. Neither one was caused by locking the rear brake. First time was on an old Honda 750 4 with 4 mufflers. Too much speed + too much lean angle = jacking the rear tire off the ground. When it came down the rear was trying to pass the front and caught traction and there it went.

Second time I was dropping into a curve at 90+ and the front end started to push. More throttle got the rear sliding and it was all good until they both abruptly caught traction, then instant highside.

Not fun no matter how it happens.
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Old 06-09-2007, 12:52 PM   #8
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The sliding rear high side is why I bought the VFR with ABS. I had locked the rear on my Honda Shadow Sabre 1100 coming up to a stop sign in the rain. I released the front and went through the stop sign. I was lucky that there was nothing coming up the cross street. Now with the VFR when I need to stop quickly, I just grab the brake and let the computer worry about keeping the tires from sliding. I have tried to lock the rear in the rain and the ABS will not let it happen.
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