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Speed bump air time

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6r4h4m
Nova Slayer



Joined: 26 Apr 2016
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PostPosted: 14:38 - 24 May 2016    Post subject: Speed bump air time Reply with quote

"Wheee! I'm flying!"

There are eleventy thousand speed bumps on my daily commute. Some are speed cushions and others are sleeping policemen. On many of them I end up with my buttocks entirely liberated from the saddle.

I've been experimenting with accelerating off the bump, to force the weight of the bike forwards so that the back end bucks less. Mixed results, mostly down to throttle control / timing. Sometimes I think it's working, other times really not!

Questions for the wise:

- do all bikes need to be below 20mph to avoid turning into bucking broncos over speed bumps, or is that just down to the littleness and suspension of my 125? (That's a question with half an eye on post-DAS bike choice.)
- shall I give up on this acceleration effort and just cut speed down more, or is there a knack I can crack if I persist?
- do I need to get something specific checked out at service intervals, in addition to the regular items that get checked?
- any other tips?

On a push bike I stand on the pedals and let the bike do its thing while I flex my legs to keep my pelvis stable. Limited experimentation suggests this is not a winning formula on motorcycle though!

Cheers guys.
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bigdom86
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PostPosted: 14:48 - 24 May 2016    Post subject: re Reply with quote

wheelie over each one, that way when you get the jump your on the pegs already and half standing
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c_dug
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PostPosted: 15:20 - 24 May 2016    Post subject: Reply with quote

Standing up with legs bent does help if done right.

There are some speedbumps that are all but kerbs, bad even at walking speed, no matter the bike. Others are basically just paint on the road.

I call them speed jumps when I have the OH pillion. She does not appreciate Laughing
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iwaldo
Renault 5 Driver



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PostPosted: 15:38 - 24 May 2016    Post subject: Reply with quote

On my thundercat I usually just push down on the pegs slighty and lift my arse up a few mm, that does the trick!
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UnknownStuntm...
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PostPosted: 15:43 - 24 May 2016    Post subject: Reply with quote

Just do this, it's really easy then.
https://i.imgur.com/qTE0YqY.gif
/thread. Laughing
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Holdawayt
Trackday Trickster



Joined: 27 Jul 2015
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PostPosted: 15:57 - 24 May 2016    Post subject: Reply with quote

I stand up and bend my legs to absorb it, failing that just place the bike between the bump and the kerb if there's room.
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Wafer_Thin_Ham
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PostPosted: 15:58 - 24 May 2016    Post subject: Reply with quote

Why are you driving over "speed cushions"? Just go between them surely?
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M.C
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PostPosted: 17:09 - 24 May 2016    Post subject: Reply with quote

Used to stand up on the pegs all the time on the XR as it could fly over speed humps, did pop the fork seals twice during the space of a year though.
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6r4h4m
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PostPosted: 17:09 - 24 May 2016    Post subject: Reply with quote

Wafer_Thin_Ham wrote:
Why are you driving over "speed cushions"? Just go between them surely?


Mostly, but not when there's an oncoming car in the way and a parked car at the side.
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TbirdX
Crazy Courier



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PostPosted: 17:47 - 24 May 2016    Post subject: Reply with quote

UnknownStuntman wrote:
Just do this, it's really easy then.
https://i.imgur.com/qTE0YqY.gif
/thread. Laughing


Scrub, FTW.

If you look closely, his right peg drags the top of the jump.
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Wafer_Thin_Ham
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PostPosted: 17:56 - 24 May 2016    Post subject: Reply with quote

6R4H4M wrote:
Wafer_Thin_Ham wrote:
Why are you driving over "speed cushions"? Just go between them surely?


Mostly, but not when there's an oncoming car in the way and a parked car at the side.


I've been riding nearly 10 years, this has genuinely never happened to me. Maybe I'm riding in the wrong places?
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6r4h4m
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PostPosted: 18:12 - 24 May 2016    Post subject: Reply with quote

Wafer_Thin_Ham wrote:

I've been riding nearly 10 years, this has genuinely never happened to me. Maybe I'm riding in the wrong places?


If you've managed to avoid riding through residential Croydon, you're probably riding in all the right places. Lucky bugger Thumbs Up
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Wafer_Thin_Ham
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PostPosted: 18:26 - 24 May 2016    Post subject: Reply with quote

6R4H4M wrote:


If you've managed to avoid riding through residential Croydon, you're probably riding in all the right places. Lucky bugger Thumbs Up


You have to ride through Croydon?!! My sympathies.
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Dave70
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PostPosted: 18:47 - 24 May 2016    Post subject: Reply with quote

Your bike will make a difference.

On my R125, it was extremely uncomfortable riding over them. On the er6f, it's much better. The comfier seat and better suspension make a world of difference.
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techathy
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PostPosted: 19:11 - 24 May 2016    Post subject: Reply with quote

Do not take take this as gospel & I'd not recommend this at all. Its just something that works for me on my R1200.

I slow down to a little below the speed I want to take a sleeping policeman. With about 2-3 meters before the front wheel hits feed in some throttle. The front wheel will floats over without a jolt & the rear being heavily loaded compresses nicely. This smoothes out the bump significantly compared to going over it at a constant speed.

You could always try the following method: https://youtu.be/rwiR4RM6Yak?t=12s
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M.C
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PostPosted: 19:46 - 24 May 2016    Post subject: Reply with quote

techathy wrote:
You could always try the following method: https://youtu.be/rwiR4RM6Yak?t=12s

That was more stupid than ballsy Shocked I once overtook a car, which started accelerating mid-overtake, so I accelerated not spotting the road hump ahead... must have gone over it at about 50 Very Happy

I think accelerating over bumps can be dangerous (especially for noobs) as the bump could cause unintended acceleration. Much more likely to happen if you're using the clutch.
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pablodrugsmul...
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PostPosted: 20:58 - 25 May 2016    Post subject: Reply with quote

Usually use the pegs to lift my legs a little with them bent so im not on the seat and i have no problems going over speed bumps. On my cbf 125 i did the same but the lack of weight made it bounce a bit, my fazers a lot heavier and nicer in every way.
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linuxyeti
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PostPosted: 21:01 - 25 May 2016    Post subject: Reply with quote

Wafer_Thin_Ham wrote:
Why are you driving over "speed cushions"? Just go between them surely?


Usually yes, unless my daughter is riding pillion, in which case she insists we go over them !!
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techathy
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PostPosted: 08:50 - 26 May 2016    Post subject: Reply with quote

M.C wrote:
I think accelerating over bumps can be dangerous (especially for noobs) as the bump could cause unintended acceleration. Much more likely to happen if you're using the clutch.


Did you even look at the health warning at the start of the post Laughing
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6r4h4m
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PostPosted: 21:19 - 27 May 2016    Post subject: Reply with quote

techathy wrote:
I slow down to a little below the speed I want to take a sleeping policeman. With about 2-3 meters before the front wheel hits feed in some throttle. The front wheel will floats over without a jolt & the rear being heavily loaded compresses nicely. This smoothes out the bump significantly compared to going over it at a constant speed.


Aha. This is close to what I had been attempting. Now that I've read Teflon-Mike's post about n00b high gear error, I today attempted the same thing in 2nd rather than 3rd gear. Better control, lower hump-approach speed, much better results, and bum generally on seat. Thanks folks! Thumbs Up
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thx1138
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PostPosted: 23:23 - 27 May 2016    Post subject: Reply with quote

I can do it. Stand up, push down on suspension, in 2nd and just twist throttle and pull back as suspension lifts just before front wheel touches. My bike does only weigh 99kilos and have a 300cc engine though.
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techathy
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PostPosted: 11:03 - 28 May 2016    Post subject: Reply with quote

6R4H4M wrote:
techathy wrote:
I slow down to a little below the speed I want to take a sleeping policeman. With about 2-3 meters before the front wheel hits feed in some throttle. The front wheel will floats over without a jolt & the rear being heavily loaded compresses nicely. This smoothes out the bump significantly compared to going over it at a constant speed.


Aha. This is close to what I had been attempting. Now that I've read Teflon-Mike's post about n00b high gear error, I today attempted the same thing in 2nd rather than 3rd gear. Better control, lower hump-approach speed, much better results, and bum generally on seat. Thanks folks! Thumbs Up

Even on the RS1200 I'd be in 2nd gear Wink.
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thx1138
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PostPosted: 14:09 - 28 May 2016    Post subject: Reply with quote

Wafer_Thin_Ham wrote:

I've been riding nearly 10 years, this has genuinely never happened to me. Maybe I'm riding in the wrong places?


B4009 happens to me somewhere along there, can't remember where though
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Hefty
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PostPosted: 07:18 - 29 May 2016    Post subject: Reply with quote

6R4H4M wrote:
Wafer_Thin_Ham wrote:

I've been riding nearly 10 years, this has genuinely never happened to me. Maybe I'm riding in the wrong places?


If you've managed to avoid riding through residential Croydon, you're probably riding in all the right places. Lucky bugger Thumbs Up


What are you riding? I'll look out for you so we can recreate that MX gif Very Happy
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MattN
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PostPosted: 12:16 - 08 Jun 2016    Post subject: Reply with quote

UnknownStuntman wrote:
Just do this, it's really easy then.
https://i.imgur.com/qTE0YqY.gif
/thread. Laughing




Very Happy Very Happy Very Happy Very Happy Very Happy Very Happy
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