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Old 01-16-2015, 05:22 AM   #1
iconman OP
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Racetech progressive rate spring on pds shock question...

Ok, I just got a Racetech progressive rate spring for the EXC rear shock to suit my weight etc... Does it matter which end of the shock the tighter group of coils go? There was no mention in the instructions and I googled it and it seems the closer coils go to the top as per photo as far as I can find out... Thanks!
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Old 01-16-2015, 05:45 AM   #2
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AS you said, tighter wound coils to the top
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Old 01-16-2015, 06:36 PM   #3
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Or would they go at the bottom were the shaft actually moves ????



It does not matter as the softer part of the spring will always take the initial travel
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Old 01-16-2015, 06:49 PM   #4
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Or would they go at the bottom were the shaft actually moves ????



It does not matter as the softer part of the spring will always take the initial travel

Yes it does, and you answered why - unsprung weight. Or at least some pendulum unsprung physics sort of thing
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Old 01-16-2015, 06:58 PM   #5
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Install the spring with the writing (on the spring)the right way up.
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Old 01-16-2015, 07:01 PM   #6
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Thanks guys. All done.
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Old 01-16-2015, 09:18 PM   #7
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Yes it does, and you answered why - unsprung weight. Or at least some pendulum unsprung physics sort of thing
How can a spring be unsprung OMG my head is going to explode. But it is a dynamic unsprung weight so still would not matter as the spring reduces with suspension travel the weight is moved higher as the bike gets lower thus staying the same .
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Old 01-17-2015, 03:43 PM   #8
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Normally half the mass of a spring is considered unsprung. But as the progressive is heavier one end, put that bit at the sprung, upper end. Not too may could feel the difference though.
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Old 01-17-2015, 09:58 PM   #9
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Normally half the mass of a spring is considered unsprung. But as the progressive is heavier one end, put that bit at the sprung, upper end. Not too may could feel the difference though.

You'd be surprised! Back in 2000 a suspension guru who would know better installed the spring upside down on my 400 exc. ( everyone is human)

Thankfully I noticed halfway through the ride ( before I had a chance to abuse him for frk ing my shock )... I was able to quietly take the shock elsewhere and no harm done

It was like having 2/3 clicks more compression but also less rebound but somehow delayed ...weird feeling.
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Old 01-17-2015, 10:26 PM   #10
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I put this question to suppliers of fork springs ( ikon) and MPE when they supplied me a new shock spring for my DR, both people said don;'t matter.
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Old 01-17-2015, 11:18 PM   #11
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Gavo, it probably doesn't matter so much with something like an ikon shock, but the early ktm pds shocks were fussy critters. Light bike, high performance, plus the teething issues of a new style of suspension? Perhaps I'm overly fussy / not good enough to ride around suboptimal suspension?? Back then I was riding with a group who were a LOT better than me, so probably the latter......

Ps is your v11 a post 03 , because it definitely matters on them - the top of the spring is tapered to fit inside a rim on the fork cap!
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Old 01-18-2015, 04:55 AM   #12
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Gavo, it probably doesn't matter so much with something like an ikon shock, but the early ktm pds shocks were fussy critters. Light bike, high performance, plus the teething issues of a new style of suspension? Perhaps I'm overly fussy / not good enough to ride around suboptimal suspension?? Back then I was riding with a group who were a LOT better than me, so probably the latter......

Ps is your v11 a post 03 , because it definitely matters on them - the top of the spring is tapered to fit inside a rim on the fork cap!
No it's an 01 model and MPE fitted the spring, but MPE supplied the shock spring for the dr, Ikon supplied fork springs and as two totally independent suppliers had the same opinion I'd say there was some truth in it. Plus if you think about it logically apart from weight being higher when mounted one way it should make fuck all differance. Sometimes things can be over anal ized
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