What can cause handlebar shake under heavy braking?

[Musketeer]

I was going round roundabout, not very fast (40 mph maybe, increasing the speed towards the exit). Then I misjudged other drivers intentions as to which lane he was going to pick and had to apply brake hard... released a little then applied again. The handlebars started shaking like mild tankslapper. I tried braking on a straight road later to see whether it would happen again but it did not.

What could have caused it?

I could have distributed to much weight on my handlebars my thoughts are, but I don't remember now.. The bike was a bit unsettled anyway.

Would you suspect something else? Bearings? Wheel balancing? My front tyre is 800 miles old.

https://www.youtube.com/watch?v=HGFx5IjCkmQ

Please skip the other part of the video
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Current Bike: Yamaha XSR900 Previous bikes: Honda CBR1000RR Fireblade, Kawasaki ZX-6R Ninja, Aprilia RS125 2-stroke

[-Matt-]

Too much front break and the bike trying to right itself as you're continuing to go around perhaps.

Or just a shite road surface - theres a long curving bend near me with a long shallow crack along it parallel with the road, and if you corner near it you tend to 'jump' in and out the crack causing a wobble.

From the video though it looks like you just hit a large stone or something.

[Musketeer]

I just went to that roundabout a while ago and I cannot tell it's excessively bumpy.. I noticed no cracks.. I don't think I hit a stone.. I cannot see any in the video
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Current Bike: Yamaha XSR900 Previous bikes: Honda CBR1000RR Fireblade, Kawasaki ZX-6R Ninja, Aprilia RS125 2-stroke

[h00dwink]

one of the few things i remember from my cbt as it was told to us before we got our hands on the bikes and demonstrated to us was not to hit the front brake hard whilst trying to turn the bars. front wheel does not like it.
or for a shorter more truthful answer, poor obs caused it.
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[thepuma]

Has your bike got ABS?
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YBR125 (SOLD) - CBR250R(SOLD) - CBR650F(SOLD) Current - Street Triple
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[Musketeer]

[Musketeer]

[thepuma]

[Musketeer]

[Enduro Numpty]

It looks to me from the video that it's just too much brake applied too quickly. We've all done it

Suspension not getting enough time to transfer weight to the front, front wheel locks for a second till tyre gets properly loaded then normal service is resumed.

I'm sure you know this but for those that don't, don't grab a handful, squeeze the brake to load the front tyre then give it the big brake. It takes a millisecond longer but will stop you far more effectively. Not always the easiest thing to do when in panic situation though

[Enduro Numpty]

It looks to me from the video that it's just too much brake applied too quickly. We've all done it

Suspension not getting enough time to transfer weight to the front, front wheel locks for a second till tyre gets properly loaded then normal service is resumed.

I'm sure you know this but for those that don't, don't grab a handful, squeeze the brake to load the front tyre then give it the big brake. It takes a millisecond longer but will stop you far more effectively. Not always the easiest thing to do when in panic situation though

[Enduro Numpty]

It looks to me from the video that it's just too much brake applied too quickly. We've all done it

Suspension not getting enough time to transfer weight to the front, front wheel locks for a second till tyre gets properly loaded then normal service is resumed.

I'm sure you know this but for those that don't, don't grab a handful, squeeze the brake to load the front tyre then give it the big brake. It takes a millisecond longer but will stop you far more effectively. Not always the easiest thing to do when in panic situation though

[Rob W]

[orac]

Don't forget alot of round about have sort of lip on the exits, between the braking on the bend, poor observations, fork compression while braking and the lip ridge thing you just gave the bike a bit too much to deal with all at the time
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Current rides - 2016 Triumph Street Triple Rx, 1994 Suzuki Bandit 400 VM, TGB 204 Classic 125cc
"with nothing left to lose, there is everything to gain. It's not the size of the dog in the fight, it's the size of the fight in the dog"

[Musketeer]

[Musketeer]

[krarkol]

Looks like you hit an upwards dip coming off the roundabout that makes the banging sound on camera? I'm thinking that this may have compressed the suspension a tad then when braking compressed it even more so you no longer have any travel which is upsetting the bike.

Just seems like one of those freak occurrences where multiple factors came into play and that there actually anything wrong with the bike
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Bandit 600 - deaded

[Bigmal]

One word - Chevrons.
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Life is 10% what happens to you and 90% what you do about it.

[gixerladsw]

two words .. shit riding!