Progressive Suspension Fork Springs

Got questions? We got answers....
Post Reply
exbee
Member
Posts: 83
Joined: 11:21 am Dec 21 2009
Country:
Location: Canada

Progressive Suspension Fork Springs

Post by exbee »

I finally found a shop that has a set of springs for my 93 KDX 250 but they are progressive rate springs. Does anyone have any experience with these in a KDX? I would assume that any aftermarket spring is better than stock. The owner tells me they are 34-41 pound progressive rate springs. I'm not sure how that relates to the kg/mm rating of other springs. I know my stock springs are straight-rate, how will the progressive rate act differently? Any advice would be appreciated.
User avatar
Indawoods
Creator and Founder
Creator and Founder
Posts: 9951
Joined: 09:59 am Jun 12 2003
Country:
Location: Midwest

Post by Indawoods »

Softer at the top... harder on the bottom.

Could work out real nice....
*** Administrator //***
****'95 KDX 200/****

"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
IdahoCharley
Supporting Member II
Supporting Member II
Posts: 1005
Joined: 06:57 pm Mar 19 2005
Country:

Post by IdahoCharley »

They sound real stiff to me. I believe the KDX springs are somewhere in the 21-23 lb range at least for the KDX 200/220 machines.
KTM 380EXC Mine
KDX 200 Mark's
TTR 125 L Wife's
KDX 200 Austin's
EC 300 Tyson's
WR430 Husky - mine
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

I thought stock kdx200 was around 33?

I'm +260 lbs and I'm running .46's on my 200
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
Julien D
KDXRider.net
KDXRider.net
Posts: 5858
Joined: 07:53 pm Nov 07 2008
Country: USA
Contact:

Post by Julien D »

33 kg yes, and yours are 46 kg. Not quite sure how that relates to lbs, or if the OP was given the right information from the vendor to begin with. I'd bet they are 34 - 41 kg, as that would make much more sense since 1 kg is about 2.2 lbs. If those springs are 34 - 41 lbs progressive, that'd be something like 75 - 90 kg??? Unless you're a REALLY REALLY big guy, I'd say that's way too stiff. I've never seen springs rated in lbs/in so I'm not sure if I'm way off base here.
User avatar
skythrasher
Supporting Member I
Supporting Member I
Posts: 423
Joined: 06:24 pm May 16 2007
Country:
Location: NW Arkansas

Post by skythrasher »

15.4-18.6 Kg = 34-41 lbs I think you may have converted the wrong way.
My Gallery
2001 KDX200
1987 KDX200
2002 CR250R
2016 KTM 350XCF-W Six Days
Image
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

found this on wiki

1 kg = 2.2 lbs
so 33 kg = 72.6 lbs
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

Springs on my Vstrom are 1.0 kg
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
exbee
Member
Posts: 83
Joined: 11:21 am Dec 21 2009
Country:
Location: Canada

Post by exbee »

Yeah, maybe the shop owner is confused. 0.34kg/mm-0.41kg.mm sounds much more reasonable. 0.34 is the stock spring rate if I'm not mistaken so the progressive springs must start at the stock rate and progress to 0.41 in the stiff part of the stroke? Does that sound right?
User avatar
Julien D
KDXRider.net
KDXRider.net
Posts: 5858
Joined: 07:53 pm Nov 07 2008
Country: USA
Contact:

Post by Julien D »

That would sound right, yeah. And if that is the case, I'd probably like those springs ;)
Image
Post Reply