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April 2nd, 2008, 10:34 AM   #1
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Should i change the spring of my rear shock absorber

Read some stuff on KTMTalk about heavy guys and the rate of the springs they use, which made me thinking about changing my reaar spring. I'm about 240lbs and on my 2004 FE 550 is the default 71-90/260 spring. If i look at the owners manual, there is an other option for a stiffer 81-99/260 spring, but these numbers don't make any sense to me. On KTMTalk, they mention a spring rate of 10.4 and up for my weight, so i was wondering if the stiffer 81-99/260 spring would be sufficient for me, or if there are any alternatives that i can use on this bike.
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April 2nd, 2008, 02:05 PM   #2
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RE: Should i change the spring of my rear shock absorber

surfdude

if ever there was a case of "read it in the doc" this is it!

come on mate! there' nothing that can be said here that would be half as good as the doc.

regards

Taffy
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April 3rd, 2008, 02:09 AM   #3
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RE: Should i change the spring of my rear shock absorber

Taffy,

Your right. Did scan through the rear spring document, but gave up once i got to the shim stack, reservoir and valves parts as the doc completely lost me there. So i didn’t get to the important part. But anyway i found the strait rate codes now, which was what i wanted to know.

Still would like to hear from some of the heavier guys here what brand / type of spring they use on their bike if compareble, and if they’re happy with their set up.
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April 3rd, 2008, 03:57 AM   #4
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Hi

To give you an idea, I am 102kg's (224lb) with no gear, my suspension has been setup using stiffer springs front and rear.
Front uses Eibach springs 974.044.1 0.44kg/mm
Rear uses Eibach spring 896.0088.1 8.8 spring rate
My forks were revalved for rocky conditions
My static sag was set correctly with myself fully geared and I find this setup very good
From memory both front and rear springs are 1 selection stiffer than standard, I only find that I bottom out occasionally on bigger jumps which are rare, I am more concerned with being able to use the full travel of the suspension during my normal riding conditions.
Check out the Eibach web site using Ktm as the make to get the details of the springs
http://eibach.com/cgi-bin/htmlos.exe/08 ... 4100021590
My suspension was setup by the Australian suspension legend Frank Pons so I am confident it is setup well.
Hope this helps
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April 3rd, 2008, 08:51 AM   #5
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i'll swap you my '02 fx650 springs for your fe springs. i'm using this bike as a dualsport, and its way too stiff for a cruiser. works good if you ride the bike hard.
the rear is a 76-95 260 and should be a direct swap. the fronts are 044w 5.10.
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April 5th, 2008, 11:08 PM   #6
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Ned,

Thanks for the offer. But i live in the Netherlands, and found that shipping rates from / to the US are rather expensive.
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April 6th, 2008, 06:34 AM   #7
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SurfDude...I'm 230 lbs. without gear and have switched to a Race Tech P30 rear spring and 48 kg fronts... have not revalved yet but this setup seems to have made a huge improvement!
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April 6th, 2008, 10:23 AM   #8
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by the way weight without gear is pointless. weight with riding gear is what you need to do you calcualtions with
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April 6th, 2008, 01:10 PM   #9
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I'm setup for 115 kg with with gear and use a 9.7 straight rate rear and .46 in the front. Its al about getting the sag right. Without correct sags, it will never work as intended. A good guide for dirt bikes is 10% of travel static and 30-35% laden, front and rear.

Steve
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April 7th, 2008, 08:50 AM   #10
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Hey Cypher...easy on the criticism...your point is obvious but we are considering reference points forsake of conversation not for specifics... so put a cork in it!
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