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Author Topic: knee draggin'  (Read 3040 times)

Offline nhmaf

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Re: knee draggin'
« Reply #15 on: January 15, 2010, 10:49:24 AM »
If it was a sudden onset, it may have been dragging something, but I'd expect you'd have heard something.   Otherwise, like the other suggest, tire pressure, fork/shock spring preload and/or oil level in the fork, loose-ish swingarm bearings, etc.

The airheads can still corner at pretty good speeds - the whole thing is that one has to be smoooooth about it.  Chopping the gas or cranking the throttle midway will be rewarded with significant suspension settling or rear end jacking, which will upset your line through the curve.   The monolever and paralever bikes are much less prone to this.
Airhead #12178 ? BMWMOA #123173 ?BMWRA #33525 ?GSBMWR #563 ?1982 BMW R65LS ?1978 BMW R100/7 1998 Kawasaki Concours

Offline Semper Gumby

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Re: knee draggin'
« Reply #16 on: January 16, 2010, 10:19:55 AM »
The torque setting on the pivot bearing of the swing arm is critical to good handling.  Make sure the steering head bearing should also be checked.  A far as technique is concered:  you might consider trail braking to keep the suspension loaded up.  When you come off the brakes and get on the throttle the suspension wants to stand up.  This might be the source of your woggle.  Wasn't there video of the same thing happening from one of our members in England during a left-hander?

Nate Kern believes that staying on the throttle entering a turn to keep the suspension standing will make for a smoother exit and more lean angle in the turn.  I cannot fathom riding this way but he is a racer and knows better.  :-/
Bill Gould ?1980/03 R65 When at first you don't succeed....Moo!

Offline montmil

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Re: knee draggin'
« Reply #17 on: January 16, 2010, 10:29:39 AM »
Trail braking works with my R65s, although I do not intend to touch down with anything other than the tires ;)   Monte
Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet

GrimReaper

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Re: knee draggin'
« Reply #18 on: January 16, 2010, 11:22:49 AM »
Quote
Nate Kern believes that staying on the throttle entering a turn to keep the suspension standing will make for a smoother exit and more lean angle in the turn.  
he is absolutely right(of course he is the racer)staying on the throttle is very imporant.I dont like trail breaking.I went back to the same turn and took a good look.The biggest mistake i did was that i aproached it from the inside which made  it very sharp turn

Offline Barry

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Re: knee draggin'
« Reply #19 on: January 16, 2010, 03:26:24 PM »
I don't believe you can say trail braking is not a good technique. I thought that the likes of Rossi used trail braking to good effect on the track although he won't be gentle trail braking will he. Isn't that why racers occasionally high side in the entry to a turn.

The other camp, some racers included say that all the braking should be done before entering a turn but I find it difficult on down hill bends. I have a down hill 90 Deg right hander on the way to work that I always trail brake into gently as far as the apex then accelerate out.

Given that I'm never seeking to touch anything down there's no hard and fast rule for every bend either gentle trail braking or acceleration both increase my stability in a bend. Coasting through gives me the willies.

« Last Edit: January 16, 2010, 03:36:13 PM by bhodgson »
Barry Cheshire, England 79 R45

Offline montmil

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Re: knee draggin'
« Reply #20 on: January 16, 2010, 04:22:28 PM »
I'm riding with Barry on this issue.

Granted, automobiles are way different from motorcycles, but I continue to carry and utilize the lessons I was taught at an automobile hi-perf driving school. Students were strongly encouraged to complete any and all braking prior to the turn apex, then start bringing in the throttle and accelerate through the turn.

On the R65s, I employ strong braking with the bike vertical, trail braking in the turn and bringing in the throttle smartly to power beyond the apex.

Granted, my motorcycle road racey-ness is tempered by my advanced age and experiences. Tipping over is no fun. I gave up my old off-road mantra of If you never crash, you're not going fast enough when I began to remember I had a family to support. Those sixteen year-olds are fast!

;DMonte
Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet

GrimReaper

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Re: knee draggin'
« Reply #21 on: January 16, 2010, 10:04:46 PM »
I did not say that trail braking is not good technique,I just do not like it.
"This technique is commonly used when racing, but can enhance control and add more evasive options for street riders, making it very worthwhile to learn or at least understand.Worth noting also is that most current (2000 through 2008) racing crashes happen while trailing the brakes into turns, amongst world class Moto GP riders...... Keith Code, founder of the California Superbike School teaches that the only way to effectively and accurately direct and turn a motorcycle is with countersteering, even going so far as to say in his 1983 book A Twist of the Wrist that "To tighten a turn and increase your lean angle, you must countersteer again"
 Wikipedia

Offline Semper Gumby

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Re: knee draggin'
« Reply #22 on: January 18, 2010, 09:59:59 AM »
Wow!   :o  Oops!  Hard crash!


Hey look what I found!

http://en.wikipedia.org/wiki/Trail_braking

Time to do some reading....   8-)

Wow interesting article.  I had it wrong.  I thought trail braking was for the rear brake.  Actually the benifit to the Boxer Twin is when it is applied for the front brake.  Now what Nate Kern says makes sense...  Hmm.  I think some gentle experiments are in order ( on my highly loaded cow).   ;)
« Last Edit: January 18, 2010, 10:09:44 AM by Semper_Gumby »
Bill Gould ?1980/03 R65 When at first you don't succeed....Moo!

GrimReaper

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Re: knee draggin'
« Reply #23 on: January 18, 2010, 11:40:18 AM »
before trying it with the front brake,watch the video.
http://www.youtube.com/watch?v=VruWHHEnZGw

 That is why i dont like trail braking.

Offline Semper Gumby

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Re: knee draggin'
« Reply #24 on: January 18, 2010, 12:23:24 PM »
Copy that!

But really I'm not going to riding that hard.   8-)
Bill Gould ?1980/03 R65 When at first you don't succeed....Moo!

DgM

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Re: knee draggin'
« Reply #25 on: January 18, 2010, 01:14:13 PM »
Trail braking can be useful when you have to 'stuff' the bike into a slow speed turn but in my experience hard braking before a turn with power on through the turn seems to provide for a quicker exit.  The rear end doesn't drop - with power on it stays in tension - and the bike seems more stable.  Oversteering slightly, along with gentle weight shift, while powering into/through a turn will give options for pointing bike during turn exit.  The slim rear tire can be induced to drift a bit and a smooth quick turn can be accomplished.  Then the massive amount of R65 horsepower can be called upon to carry you to the next corner.

Offline montmil

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Re: knee draggin'
« Reply #26 on: January 18, 2010, 01:28:23 PM »
Countersteering and trail braking are two entirely different animals. Both are effective riding techniques that every rider should, at least, be aware of.   Monte
Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet

Offline Barry

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Re: knee draggin'
« Reply #27 on: January 18, 2010, 02:43:55 PM »
Quote
I have a down hill 90 Deg right hander on the way to work that I always trail brake into gently as far as the apex then accelerate out.  

Quote
Trail braking can be useful when you have to 'stuff' the bike into a slow speed turn  

My down hill right hander is a slow speed turn so that figures.

I don't go in for drifting rear tires though at least not on intentionally.
Barry Cheshire, England 79 R45

DgM

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Re: knee draggin'
« Reply #28 on: January 18, 2010, 09:43:25 PM »
OVERsteering - turning the front wheel INTO the turn slightly to scrub off speed and help rotate the bike through the apex.  Useful with trail braking or not, helpful with R65 to keep revs and rear suspension from dropping.  COUNTERsteering - turning the front wheel in opposite direction on EXIT of turn when rear wheel drifts out.  Dirt track stuff applicable to street riding with extreme care, easily accomplished with slim R65 rear tire.

Darwin_R65

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Re: knee draggin'
« Reply #29 on: January 19, 2010, 04:40:30 AM »
Just referring to my booklet "The methods of Experts" printed 1950 compliments of BSA and Sunbeam and it states that brakes should only be applied when vertical.
 :)