Progressive Rate Fork Springs - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 15 Old 03-10-2004, 02:51 PM
Woofy
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Progressive Rate Fork Springs

I'm considering upgrading my front fork with progressive rate fork springs in an effort to firm up the front end wallow in the twisties while keeping the plush ride on the highway.

Has anyone else had made this modification? What brand of springs did you use? What are your impressions regarding improvements in ride and handling?

From what I'm able to find, it looks like the manufacturers of progressive rate fork springs for the 'Strom are Wirth or Wilbers from Germany and recently Progressive Suspension from the USA. Are there others?

Thanks in advance for everyone's input!
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post #2 of 15 Old 03-10-2004, 08:49 PM
 
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progressive fork springs

I installed the Wirth springs back in the summer of 2002. I got them through Tour Tech I believe. At the time they were the only ones available. They made a slight improvement in the feel of the front end.
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post #3 of 15 Old 03-11-2004, 12:03 AM
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Progressive

I prefer straight rate springs, myself. I put Racetech springs in my SV650 and they helped immensely in stopping bottoming out and wallowing.

I plan on doing the same exact mod for my DL this summer. The springs are first rate and they are not harsh.

I may also look into the gold valves from Racetech while I'm swapping the springs.

http://www.racetech.com

FWIW.

Currently Bikeless
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post #4 of 15 Old 03-11-2004, 11:08 AM
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Progressive Springs

Although I do not YET own a DL [deposit on a 650 this Saturday] I standardly put Progressive brand springs in any bike I buy. Less dive, no bottoming out, firm but smooth on the highway.

Bobb
post #5 of 15 Old 03-26-2004, 01:56 PM
Woofy
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Took the plunge yesterday and ordered Progressive Suspension's fork springs for the V-Strom and more viscous oil to replace the crappy stock oil.

From the feedback from this board and other owners, it appears Progressive has made their fork springs for the 'Strom to be slightly stiffer than the spongy stock spring rate at the low end and then firming up pretty significantly upon compression to avoid the annoying front end wallow. They're being installed a week from tomorrow and weather permitting, I'll give the bike a workout on some familiar roads then post my impressions.

If they suck, I guess I'll order a set of the German progressive springs or the RaceTech fixed rate springs.
post #6 of 15 Old 03-26-2004, 03:20 PM
 
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Springs

Woofy

When you get the Springs if there is any data on them please post it.
The Wilbers are .650 Kg/mm to .950 Kg/mm, then we can see how they compare. OEM springs are .760 Kg/mm. How much do you weigh. I'am 240lbs and my bike also wallows.I think you can also have the valving shims changed in the forks. My main concern would be that the springs would be to stiff for long tours.

Scooter
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post #7 of 15 Old 04-09-2004, 07:12 PM
Woofy
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Re: Springs

Quote:
Originally Posted by scooter
Woofy

When you get the Springs if there is any data on them please post it.
The Wilbers are .650 Kg/mm to .950 Kg/mm, then we can see how they compare. OEM springs are .760 Kg/mm. How much do you weigh. I'am 240lbs and my bike also wallows.I think you can also have the valving shims changed in the forks. My main concern would be that the springs would be to stiff for long tours.

Scooter
They're in and will be installed tomorrow morning at 9am. It'll be a few days until I get back to post as it's supposed to be warm and sunny this weekend so I'll be riding the minute it's outa the shop until Sunday evening. Yahoo!
post #8 of 15 Old 04-10-2004, 03:22 AM
 
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s

Any # for the springs Woofy.


scooter
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post #9 of 15 Old 04-12-2004, 05:09 PM
Woofy
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WOW!

Quote:
Originally Posted by scooter
Any # for the springs Woofy.

scooter
Sorry to say, there wasn't a single thing in the packaging, instructions or on the box that indicated the spring rates. Arrrgh!
post #10 of 15 Old 04-12-2004, 10:13 PM
 
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FS

Woofy

Know I'am confused, no reference comparing the Wilbers to the Progressives to the Wirths.

Let's get a reference to the weight of the rider for these springs.
I'am 240lbs and have not tried any of these springs.
Here's what I have heard: The Wirth springs make little difference.
R. Hals at 275lbs installed the Wilbers and wants to go to a straight coiled spring of .970Kg/mm. Woofy a rider at 210lbs. likes the Progressive Suspension springs Inc. So, I think the rider around 225lbs would be happy with the Wilbers or the Progressive Suspension Inc. Stock OEM is .760 Kg/mm, the Wilbers seem to start out softer at .650Kg/mm then get firmer up to .950Kg/mm.

Like you say Woofy for the heavier rider go with a higher weight oil.

I think if you increased the preload it would remove some of that softness in the intial .650 Kg/mm of progressive springs. Progressive Suspension Inc. asks for a 4.25" of preload. Stock OEM has a 50mm spacer or 2".

Have you preloaded the suspension more Woofy ?

Scooter

I will try to E-mail Progressive Springs to see if I can get any data.
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