Rear Shock Question - Kawasaki ZX-10R.net
 
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post #1 of 7 Old 05-15-2007, 06:45 PM Thread Starter
 
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I was talking to my Dad today about how he should tighten up the spring on his Triumph Rocket 111 because he is "hinging" through the turns(he rides too fast just like me ) And he asked a question that I wasnt sure about : If you adjust a spring preload stiffer, do you lower the ride height of the rear in the process? By making the spring shorter, have you made the rear shock lower the seat height? I would be interested to see what you guys think about this because I never measured mine before I adjusted the spring and after....
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post #2 of 7 Old 05-15-2007, 06:53 PM
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it will do the opposite. Tightening spring preload will make the rear suspension sag less when he sits on it. Overall it will slightly raise seat height, untill you go overkill and top out the suspension.
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post #3 of 7 Old 05-15-2007, 06:54 PM
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Originally Posted by jessiah1 View Post
I was talking to my Dad today about how he should tighten up the spring on his Triumph Rocket 111 because he is "hinging" through the turns(he rides too fast just like me ) And he asked a question that I wasnt sure about : If you adjust a spring preload stiffer, do you lower the ride height of the rear in the process? By making the spring shorter, have you made the rear shock lower the seat height? I would be interested to see what you guys think about this because I never measured mine before I adjusted the spring and after....

No, depending on how you look at it, you are actually "raising" the ride height by decreasing your sag. You need to set the sag properly first. BTW, how much does your dad weigh? If he is much lighter/heavier than average, a different spring may be in order first...
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post #4 of 7 Old 05-15-2007, 07:41 PM Thread Starter
 
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No, depending on how you look at it, you are actually "raising" the ride height by decreasing your sag. You need to set the sag properly first. BTW, how much does your dad weigh? If he is much lighter/heavier than average, a different spring may be in order first...
Well he is ridding an 800 pound cruiser with a non-adjustable shock, only the preload can be adjusted, it has four settings and he is in the middle. I understand that the bike will SAG less, actually thats how we started talking about the ride height. I said that his seat height would be higher with increased preload. And he said that if he compress's the spring with the adjustment wouldnt that shorten the shock and spring which would either lower or keep the height the same after less SAG.


I think my question is : If you compress the spring by adding preload, does it shorten the shock and spring itself? Because obviously the spring gets smaller with more adjustment...I may be missing something technical here....YOOOO, BD you wanna put 2 cents on this?
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post #5 of 7 Old 05-15-2007, 08:06 PM
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Increasing the preload will shorten the length of the spring, however, the length of the unloaded shock will remain almost the same (less sag may mean the shock is actually slightly longer).
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post #6 of 7 Old 05-15-2007, 09:27 PM
 
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Setting preload technically does not effect ride hight. Sure it will change sag...but actual ride hight is unaffected by preload. When you add preload, you are not shortening the spring, just the range of motion it has available to it. With it being a cruiser, I say try cranking it all the way stiff...but I doubt it will make much difference. Those are shaft drive are they not? Shaft does not respond the same way that a chain drive does.
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post #7 of 7 Old 05-16-2007, 02:16 PM Thread Starter
 
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Setting preload technically does not effect ride hight. Sure it will change sag...but actual ride hight is unaffected by preload. When you add preload, you are not shortening the spring, just the range of motion it has available to it. With it being a cruiser, I say try cranking it all the way stiff...but I doubt it will make much difference. Those are shaft drive are they not? Shaft does not respond the same way that a chain drive does.

Yea, shaft drive. He can buy a stiffer spring and shock setup, I think he is going to just try the 2 more clicks to full stiff and see how that goes. He may buy something better down the road, he is paying to drill a well right now, 8k, uh!
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