BAR SNAKE

preston1200gs

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Hi group, been getting tingleing in my hands and fingers after riding for only about 1 hour its like some sort of micro vibration because i cant feel it. Has anyone had this problem, and has anyone tried a Bar Snake.
 
Grip puppies. From sportouring :beerjug:
 
Bar snake is no good (as above) and they no longer offer the liquid version. I'm working on some energy absorbing grips that will add 6mm dia to the standard grips. I personally find the GS grips a bit skinny so 1/8" extra all around is good for me. They will need beta testing.

Dave
 
Bar Vibes !

What Tyre have you on the front? Conti Trial Attack gave me wobbly handlebars especially when taking hands off while going down hill, just changed to Next so hoping this has cured the problem.
 
Ive had Bridgestone Battlewing and Maxxis Detour. The latter create a buzz at some speeds when turning into a bend but its nothing like the vibes from the engine especially under acceleration when you have no choice but to hold on.

All bikes have a front wheel flutter frequency caused by the tyre and steering self centering. Its more obvious on slow steering bikes with "normal" forks. If it continues when rider leans on the bars get the steering bearings checked for wear. If its just a flutter dont worry, its the steering working freely as it should.
 
All bikes have a front wheel flutter frequency caused by the tyre and steering self centering. Its more obvious on slow steering bikes with "normal" forks. If it continues when rider leans on the bars get the steering bearings checked for wear. If its just a flutter dont worry said:
Not sure I agree with that. I've changed to Roadsmarts and it has stopped the front wheel wobble with no hands and the rear tyre noise when cornering-especially 2 up.
 
They are mostly blocked up, certainly not like an open pipe. There is a threaded insert that accepts the massive bolt that holds the bar end on. M10 thread IIRC. I suppose you may be able to get something in there if you are good at squeezing your snake into tight holes. Fnarr.
 
Regarding steering wobble ("wiggle" is a better description)

Not sure I agree with that. I've changed to Roadsmarts and it has stopped the front wheel wobble with no hands and the rear tyre noise when cornering-especially 2 up.

Its an engineering fact that all bikes do it. Hossack or Telelever front ends hide it very well. But its caused by the front tyre interacting with the steering castor. Its not dangerous just a sign that the steering is moving freely. Some tyres will do it more than others.

Its more obvious on normal forks because the steering and suspension also interact adding more potential for instability. On a slow steering chopper the flutter will happen under 30 mph with a higher amplitude. On the steep angle (quick steering) sports bike it happens at about 60 with less amplitude and more frequency. The riders hands holding the bars are enough to damp out the effect so most of the time we never notice it. Strangely, stiff steering head bearings can make the effect more obvious. Probably because the forces get fed into the frame to resonate back into the steering.

Bikes are articulated vehicles. Smaller ones can have 20% of the vehicle weight ahead of the steering pivot. So any wiggle will be really obvious (though being small the forces are low). BMW boxers have a smaller percentage of their weight being steered and they separate the suspension forces so are inherently much more stable.

Under certain conditions cars can show the same thing. Normally the square car tyre, flat on the road damps out its own tendency to flutter against the castor angle. A car steering geometry should put the steering pivot point central to the tyre contact. But fit wheel spacers and and the appropriate speed in a corner the wheel will flutter. Go OTT for wide wheel style and add some negative feedback and it can get nasty. I built a Jago Geep kit car back in the 1980s. It had wide wheels with lots of offset and lots of negative camber so seemed fine for a while. But as the inside edge of the tyres wore down the steering got ever more unstable and always around 40mph. The solution was to put the suspension geometry back to standard and fit wheels with the correct offset. Today the manufacture would have been sued out of existence.

Bikes have a rounded tyre with the steering axis ahead of the contact patch. This gives a castor effect to self centre the steering but at some speeds there can be a light flutter. Its an engineering compromise.
 


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