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Author Topic: Progressive Fork Springs - Can you tell?  (Read 283 times)

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Offline KwaiPappaGaai

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Progressive Fork Springs - Can you tell?
« on: February 19, 2019, 11:53:26 am »
Hi there, I recently bought a 2011 KLR. Is it possible to tell whether a KLR has progressive front springs or not, without opening it or something like that? For example, can you measure if it is higher in the front or something simple like that?

 

Offline dieseldawie

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Re: Progressive Fork Springs - Can you tell?
« Reply #1 on: February 19, 2019, 12:18:10 pm »
They tend not to sag so much with progressives But I would open and take a look. Maybe change your fork oil at the same time
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Offline KwaiPappaGaai

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Re: Progressive Fork Springs - Can you tell?
« Reply #2 on: February 19, 2019, 12:27:07 pm »
They tend not to sag so much with progressives But I would open and take a look. Maybe change your fork oil at the same time

Thanks, if you open it, how would you know?
 

Offline Jacobsroodt

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Re: Progressive Fork Springs - Can you tell?
« Reply #3 on: February 19, 2019, 12:31:53 pm »
.
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Offline Piet

Re: Progressive Fork Springs - Can you tell?
« Reply #4 on: February 19, 2019, 12:32:50 pm »
The spring has a section of wider spaced coils and then the spacing gets smaller and smaller as you move to the other end of the spring.
 

Offline KwaiPappaGaai

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Re: Progressive Fork Springs - Can you tell?
« Reply #5 on: February 19, 2019, 12:37:24 pm »
Thanks for the replies, now what about without opening it? Surely it must be higher than standard?
 

Offline Piet

Re: Progressive Fork Springs - Can you tell?
« Reply #6 on: February 19, 2019, 01:44:22 pm »
Thanks for the replies, now what about without opening it? Surely it must be higher than standard?
The standard spring has a long spacer that goes with that short spring. Stock springs sag and progressive springs sag too. Height is determined by the fork on the long side and by the spring sag on the short side. If it is taller than factory height, then someone has done a fork conversion, if it is shorter than factory height, you know springs have sagged, but it doesn't tell you what springs are in there.

Just loosen the fork clamp, open the fork cap and check the spring. It's a 10 min job. ;)

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Offline KwaiPappaGaai

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Re: Progressive Fork Springs - Can you tell?
« Reply #7 on: February 19, 2019, 04:59:02 pm »
OK, so I removed the spring and its progressive. BUT

The spring is very short, just over 18", whereas from what I read about progressives they are in the region of just over 22" The standard spring is about 14"

ANy spring specialist here that can tell me how long they should be? Could they have sagged that much?
 

Offline KwaiPappaGaai

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Re: Progressive Fork Springs - Can you tell?
« Reply #8 on: February 19, 2019, 05:02:36 pm »
I have also noticed the springs were put in the wrong way. The more tightly coiled part was at the bottom, and I read they ist be at the top...
 

Offline lecap

Re: Progressive Fork Springs - Can you tell?
« Reply #9 on: April 23, 2019, 03:59:08 pm »
I have also noticed the springs were put in the wrong way. The more tightly coiled part was at the bottom, and I read they ist be at the top...

Which way around is dictated merely by the attempt t oreduce unsprung mass. Besides that it does not matter.
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Offline lecap

Re: Progressive Fork Springs - Can you tell?
« Reply #10 on: April 23, 2019, 04:04:19 pm »
OK, so I removed the spring and its progressive. BUT

The spring is very short, just over 18", whereas from what I read about progressives they are in the region of just over 22" The standard spring is about 14"

ANy spring specialist here that can tell me how long they should be? Could they have sagged that much?

The length of the spring is primarily determined by what suspension travel it has to support. Beyond that also by the quality of the spring steel. Cheaper springs will be longer and made from thicker wire. If your springs are 495mm free length and if they actually are aftermarket KLR springs then they likely come from me.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." (Red Adair)