Topic: Fork travel and "slack"

[mathias2803]

Hello. After changing fork tubes and Springs to cycleX 1 inch shorter I feel like there is too much slack. When the bike is on ground I measured from the wheel to lower tree about 12cm, when lifted on bike jack I measured 15cm. So 3cm "slack"
I dont know if this is normal or if I should add spacers in the tube or stiffer springs.

After I changed the forks I have added new higher rear shocks so this have ofcourse changed the trail and rake for the worse.
It feels heavy to push the handle bars from side to side. But when on bike jack and not lowered all the way down the steering feels better. This makes me considering changing the tubes to longer ones or if possible add longer spacers.
But I'm unsure about this. I want to do it the right way.
Anyone can enlighten me or link to information?

The whole point of this was to lowering the bike. But I had to make it higher in the back to avoid the backwheel from hitting the frame.

In advance thank you for dealing with my lack of knowledge

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[Tracksnblades1]

Reading your post, I would think it would steer easier since the fork angle is getting a little steeper. Not near that of a modern crotch rocket though.

I would replace the jack with a concrete curb, side walk, etc, that represents the height your after.
The jack is changing the weight that the front tire must support. And what you must overcome to steer it sitting still.

I would check your front tire pressure also. Low tire increases the contact patch making it harder to turn especially sitting still. Is your front tire near the original size..? Or is it a wide sticky one...?

[mathias2803]

Reading your post, I would think it would steer easier since the fork angle is getting a little steeper. Not near that of a modern crotch rocket though.

I would replace the jack with a concrete curb, side walk, etc, that represents the height your after.
The jack is changing the weight that the front tire must support. And what you must overcome to steer it sitting still.

I would check your front tire pressure also. Low tire increases the contact patch making it harder to turn especially sitting still. Is your front tire near the original size..? Or is it a wide sticky one...?

Also guess I'm talking about sag, not slack

Just to clarify, I removed the exhaust and had the jack under the bike. Not under the front tire. But yea that makes sence
The tire is regular Dunlop 90. Some more air wouldn't hurt, but don't don't think that would make much difference.

Should the spring be compressed by the fork tube bolt when the bike is lifted? Without any spacers the bolt doesn't even touch the spring when the bike is on a jack.

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[mathias2803]

Btw the springs are progressive. They feel very soft, I can easily bounce the bike up and down with no effort. I use 10w oil. Maybe some stiffer springs will help out.

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