Fork Air preload? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 22 Old 10-11-2016, 12:32 AM Thread Starter
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Fork Air preload?

Anyone had done this on Wee?
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post #2 of 22 Old 10-11-2016, 04:16 AM
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Thought about it, but the PITA problem of having to make up a special tool to adjust the normal preload put me off.

If you do it, be sure to let us know how it goes

Pete
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post #3 of 22 Old 10-11-2016, 06:25 AM Thread Starter
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Thought about it, but the PITA problem of having to make up a special tool to adjust the normal preload put me off.

If you do it, be sure to let us know how it goes

Pete
Bicycle shock pump like this

I suppose regular pump would work but it would be harder to get pressure right. And it would be one extra thing to carry.

The beauty of air preload that along with sag you will be also adjusting spring rate.. which makes sense as more sag usually means heavier rider.
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post #4 of 22 Old 10-11-2016, 11:36 AM
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Using air in the forks was done by a lot of manufacturers a while back. I don't know any do it now?
I had a tiny hand pump that was used back then.
A search shows air suspensions for Harleys. Pricey stuff!
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post #5 of 22 Old 10-12-2016, 10:02 AM
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Adding air to damper rod forks was popular back in the late 1970's and early 1980's. It was abandoned because all it did was make the forks harsher as pressure was added. Modern air forks are very different, and even the best new air forks are only just now approaching the performance levels of the best spring forks. Purchasing the correct spring rate will always be much better than simply adding air on top of a weak spring.


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post #6 of 22 Old 10-12-2016, 10:19 AM
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I have a rear air shock (Cloud 9) on my Kona mountain bike and it works fabulously.
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post #7 of 22 Old 10-12-2016, 10:39 AM
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I had several Honda's with air forks and shocks. If all the air was removed the fork was very soft. As soon as you put a little (1 or 2 lb.) in them, they started firming up. I think they were designed to have a very large range of stiffness and load capacity. They gave a very comfortable ride and I liked them a lot. That said, I'm not a professional motorcyclist like some folks and wouldn't know the performance levels of the best spring forks from a 2x4.
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post #8 of 22 Old 10-12-2016, 06:10 PM Thread Starter
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I decided to take a dive and got a set of oem 43mm caps off fazer.

If my back of the napkin calculations are correct, adding 15psi would firm up stock Glee springs to 0.98kg/mm and 30psi to 1.12. Insistently per RaceTech calculator rates correspond to 220 and 300lbs rider.

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post #9 of 22 Old 10-12-2016, 06:33 PM Thread Starter
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Originally Posted by gplassm View Post
Adding air to damper rod forks was popular back in the late 1970's and early 1980's. It was abandoned because all it did was make the forks harsher... Purchasing the correct spring rate will always be much better than simply adding air on top of a weak spring.
I think the major advantage of air is adjustability. Old Concours had rear air shock and you could adjust it from solo to 2up loaded by adding a few PSI.

The issue I am having with Glee forks that the rate is right for my weight, but not for full load. Yes most of additional weight is riding over rear and Intiminators helping with brake dive, but still being able to stiffen up front would be of help.

And no I don't wanna stiffer front springs as I only spend small ℅ of the time 2up loaded.
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post #10 of 22 Old 10-12-2016, 10:42 PM
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Originally Posted by cyclopathic View Post
I think the major advantage of air is adjustability. Old Concours had rear air shock and you could adjust it from solo to 2up loaded by adding a few PSI.

The issue I am having with Glee forks that the rate is right for my weight, but not for full load. Yes most of additional weight is riding over rear and Intiminators helping with brake dive, but still being able to stiffen up front would be of help.

And no I don't wanna stiffer front springs as I only spend small ℅ of the time 2up loaded.
That old Concours had adjustable damping too, so you could tailor it to the air pressure. Hard to do that with damper rod forks.

The other downside to air in motorcycle forks is that it makes the rate more progressive, which is a bad thing.

MTB suspension needs and priorities are very different from motorcycles, very little theory or practice transfers between the two.

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