Thinking about new fork springs - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 16 Old 10-14-2019, 03:39 AM Thread Starter
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Thinking about new fork springs

It's well known that the standard fork springs on the 650 are pretty soft.
i'm 255 lbs and the racetech site says i need about 1 kg/mm front springs.
do you guys think it's about right?

another question, racetech springs are non progressive, while most other offers i find are progressive (Wilbers, Hagon,Wirth and few more) the progressive ones do not show rates - i guess because they are progressive
So... should i go with progressive on non?

A friend told me to "just put a longer spacer and heavier oil instead of replacing the springs", what's the general opinion on that?

Thanks
Eran
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post #2 of 16 Old 10-14-2019, 09:46 AM
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Heavier oil will work to some degree. I'm 265 and I used 15W fork oil on my ZRX. However, any spring supplier will have a chart to indicate the proper spring rate for your fully geared weight.

https://www.racetech.com/ProductSear...-Strom/2004-18

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Last edited by Big Boy; 10-14-2019 at 09:49 AM.
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post #3 of 16 Old 10-14-2019, 11:32 AM
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I have/installed .95 Racetech springs earlier this Summer, but I highly recommend instead you go with Sonic springs. They are pre cut for our bikes and not universal kits, just reuse the stock spacers. I too thought of going progressive, but folks who know MUCH more than I do about suspensions, all said to go with straight rate springs. The difference it has made in the handling of my bike is very noticeable, it is so planted now and has no pogo nose dive like it used to. Ride can be a bit harsh depending on road conditions, I will likely opt for intimidators or emulators in near future.

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post #4 of 16 Old 10-14-2019, 12:35 PM
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Just for comparison: My Bike DL1000

The Sonic Spring Rate Calculator for My Situation is Shown Below.
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"There comes a time in the affairs of men, when we must take the bull by the tail and face the situation."
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post #5 of 16 Old 10-14-2019, 01:21 PM
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Adding a longer spacer will not make the existing springs stronger it'll only add preload to the existing spring. Using thicker fork oil slows the rebound as it moved more slowly through the holes in the damper rod. While these are band-aid fixes at 255lbs stiffer springs matched to the right weight oil is going to get you the best results. Well that's not totally true either. For best result adding in either Racetech Gold Valve or Ricor Intiminators to the properly rated springs matched fork oil will go a long way in modernizing your front suspension. It also would not hurt to install a for brace. The long think fork legs of the DL have a lot of flex. A fork brace goes a long way in minimizing this and making the front end much more planted in turns.
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post #6 of 16 Old 10-14-2019, 02:08 PM
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Quote:
Originally Posted by PerazziMx14 View Post
For best result adding in either Racetech Gold Valve or Ricor Intiminators to the properly rated springs matched fork oil will go a long way in modernizing your front suspension. It also would not hurt to install a for brace. The long think fork legs of the DL have a lot of flex. A fork brace goes a long way in minimizing this and making the front end much more planted in turns.
I second the notion. At 160 lbs the stock spring rate & weigh oil work for me (not a 255 pounder), but the Gold Valve Emulators were a definite improvement.

The folks at Ted Porter's Beemer shop have sorted out the suspension on my last 3 bikes (not all Beemers). Give them a call. At the very least you'll get free advice on your options plus a quote.
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post #7 of 16 Old 10-14-2019, 07:00 PM
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0.95 springs and 10w fork oil are what you need. I would do that first before trying anything else, if you later decide valving changes are needed you'll still want to have the right spring rate in there.
Either Race-Tech or Sonic springs are fine, both are quality straight-rate springs.

I used to own Sonic Springs so I'm a little partial to them, and the current owner is a very knowledgeable guy, so that would be my vote.
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post #8 of 16 Old 10-16-2019, 02:27 AM
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Do you ride pavement or unpaved as well? Sitting or standing? If you don't ride standing single rate is just fine.

IIRC Progressive brand fork springs are dual rate 0.70kg/mm on soft and 1.16kg/mm on hard. I had used them but for my 155lbs they were too stiff.. the sweet spot was ~1/4 turn on preload; hard to dial in it would be next to impossible without adjustable caps. If I were doing it again would have gone with HyperPro both front and back the transition on them is much wide, while the rates are similar 0.7/1.17kg/mn. Rear worked beautifully from solo unloaded to 2up+luggage, from 180 to 435lbs.

Last edited by cyclopathic; 10-16-2019 at 02:29 AM.
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post #9 of 16 Old 10-16-2019, 06:00 PM Thread Starter
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Quote:
Originally Posted by cyclopathic View Post
Do you ride pavement or unpaved as well? Sitting or standing? If you don't ride standing single rate is just fine.

IIRC Progressive brand fork springs are dual rate 0.70kg/mm on soft and 1.16kg/mm on hard. I had used them but for my 155lbs they were too stiff.. the sweet spot was ~1/4 turn on preload; hard to dial in it would be next to impossible without adjustable caps. If I were doing it again would have gone with HyperPro both front and back the transition on them is much wide, while the rates are similar 0.7/1.17kg/mn. Rear worked beautifully from solo unloaded to 2up+luggage, from 180 to 435lbs.
I ride mostly paved but will go out on a gravel road occasionally, learning to ride standing up.
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post #10 of 16 Old 10-16-2019, 07:47 PM
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I ride mostly paved but will go out on a gravel road occasionally, learning to ride standing up.
IMHO if you plan to keep bike get DDC, top caps and HyperPro springs F/R for DIY or send it to a good shop good luck.
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