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Last week going to Cedar vale, at stop lite I did a shot gun start got the front wheel off the ground about a foot, ( loaded with camping gear about 120lb. Plus me175lb.) haven’t adjusted the shock off low poison because of my 8’9” height. Well today coming back from mo-can passing a car faster than I like, started getting a high speed wable. Pull back on the bars nothing( pushing against my back pack gear , so let off the gas that’s when it got really bad bad. How do you get out of a high speed wobble more power and more power pushing on the bars as hard as I could, got out of it but I was going really fast(I don’t think I changed lanes but all those car’s were about 1/4 mile behind now and not ant hurry to come any closer. What I think running over loaded with out spring tension on shock. You guy’s beware.It was bad I don’t think I went stop to stop but I have when I was 50 year’s younger.Rudy
I don't think a warning to others is necessary. You, on the other hand, could learn a thing or two about suspension set up. One lesson would be that the preload setting is not for adjusting ride height. If you were carrying that much weight and with little to no preload applied to the rear shocks you caused this problem.
You, on the other hand, could learn a thing or two about suspension set up. One lesson would be that the preload setting is not for adjusting ride height.
Too much speed, heavy load in the bags and not enough preload will almost always produce what you experienced. Keep in mind that increasing the preload MAY increase ride height unladen, but with 120lbs of load plus your weight the bike will settle.
Optimal pre load is only as good as a given spring rating. Ride height means little if you have to exceed the optimal range of a spring to achieve a given ride height.
Probably a combination of things caused this . TS
My top case is Give 30 L about 10 lb. of cargo. Tire pressure though came after the wild ride plus stem torque plus high front fender, 8500 miles on bike And by pushing hard forward I did put weight on the front. TheGive planners had about 20 lbs. evenly. I pack wide and tight not over the top of the case except my coat. I my have been going fast when I got control and started slowing down I was at 92 mph I don’t know how fast I had to go to get out of the warble it didn’t go away easily. I think when I pasted the car I my have doing 90 + mph I wasn’t looking and then when it started I didn’t look had to much on my mind. Speed ca kill.Rudy
Do you not agree Lucian, that the spring “range” (rating would be better), is independent of pre load.The spring does not know what ride height you have.If you stand on the 3rd rung of a ladder and use a slinky, you can stand on the 5th rung and the slinky will perform the same, it’s just further up the ladder.....
Yes the bike will settle, but the alteration of pre load will NOT alter the LENGTH that the spring settles TO.It will only reduce the static sag.If your unpreloaded spring is 200 mm long when FULLY LADEN, it will still be 200 mm long FULLY LADEN, when you add preload. So you see that the SPRING is in the same condition compression wise, but it has not allowed as much static sag, so therefore the damping rod is not as compressed, therefore the ride height is higher.Just consider this...You have loaded your bike ready to go with rider aboard and a glamorous assistant holds it level on it’s wheels.The damper rod is compressed 100 mm, so it’s 100 mm away from it’s top stop, it is NOT topped out.You then have someone wind on 50 mm of pre load while you are on board.As the bottom adjuster is being wound up, what stops the top collar retreating away from the compressing spring ?NOTHING...!After you have added 50 mm of pre load (and the spring is holding the same weight as before), the compressed length of the spring will be the same as before you added the pre load, it’ll just be 50 mm more extended, giving increased ride height but not an alteration to the performance of the spring.Please if you’re going to respond, don’t tell me “My mate used to have a Norton.........and. ..Ummm....”
I don't understand the slinky analogy, From rung to rung the slinky would perform the same , but dropped to the floor off rung three vs. rung five the Slinky's spring rate would diminish greatly , It's important to consider static sag and spring rate relative to rider sag when determining preload. Ride height is only relevant when the spring rate and rider sag are within the acceptable range.
Youre talking in circles my friend ;-) Cranking up the preload will result in an increase of static (unladen) ride height, and reduce sag. Never mentioned or implied increasing spring length. It is all about resistance to load and resulting height. My point was he said he had the preload on lowest setting to keep the static height lower due to his 8'9" height. I'm assuming he meant 5'9" All I was pointing out was that his increased load would have likely brought the ride height down to where it was on the lowest setting unladen, and remove his concern about reaching.
Youre talking in circles my friend ;-) Cranking up the preload will result in an increase of static (unladen) ride height, and reduce sag. Never mentioned or implied increasing spring length. It is all about resistance to load
Yes and there is no real argument there, the bike will settle less when you roll it off the centrestand and the weight of the unladen bike hits the wheels, but the spring will be in the same condition (length) after you jump on, as it would have been if you’d added no pre load.It’s just that the eye to eye length of the shock is greater (longer) so ride height is increased.
Yup, on the same page.