Stock Spring Rates? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 13 Old 09-06-2010, 08:08 PM Thread Starter
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Stock Spring Rates?

I searched but couldn't find the answer. What are the stock fork and shock spring rates for a 2004 DL650? I know the fork springs are progressive, so there should be a range for those (i.e., .70-.80 kg/mm or something like that).
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post #2 of 13 Old 09-06-2010, 09:42 PM
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It doesn't matter -- unless you're Gollum, a bantamweight boxer, a professional jockey, or an extra in a Wizard of Oz remake, the stock spring rates are Way Too Soft. I don't know if anyone's ever bothered to measure.

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post #3 of 13 Old 09-06-2010, 10:18 PM Thread Starter
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Originally Posted by bwringer View Post
It doesn't matter -- unless you're Gollum, a bantamweight boxer, a professional jockey, or an extra in a Wizard of Oz remake, the stock spring rates are Way Too Soft. I don't know if anyone's ever bothered to measure.
Well, it does kind of matter, because I would like to know what I have now as a baseline before I order something to replace it. I know I need stiffer springs, primarily because there's too much front end dive when braking while riding 2-up. However, I don't want to go too stiff because most of my riding is solo on beat up roads and some offroad. The stock fork springs with the preload maxed out aren't really THAT soft in those conditions (just needs a tad more bottoming resistance). I'm not the average Strom rider so I'm hesitant to just order .95 fork springs because they work for some other 220lb rider who rides mostly smooth pavement.

The guy who's going to do my suspension will put the shock spring on a dyno, so I really don't need to know it's value.
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post #4 of 13 Old 09-06-2010, 11:31 PM
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Originally Posted by OhioPT View Post
Well, it does kind of matter, because I would like to know what I have now as a baseline before I order something to replace it. I know I need stiffer springs, primarily because there's too much front end dive when braking while riding 2-up. However, I don't want to go too stiff because most of my riding is solo on beat up roads and some offroad. The stock fork springs with the preload maxed out aren't really THAT soft in those conditions (just needs a tad more bottoming resistance). I'm not the average Strom rider so I'm hesitant to just order .95 fork springs because they work for some other 220lb rider who rides mostly smooth pavement.

The guy who's going to do my suspension will put the shock spring on a dyno, so I really don't need to know it's value.
If the stock springs are too light, which they are for many, it really does not matter.

Use the spring calculator on the Sonic Spring site for reference, they work.

I've resprung my last 3 bikes with 1.0's and I'm about 230....they are worlds better.

I ride mostly all street, and relatively spirited in the twisties.
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post #5 of 13 Old 09-12-2010, 12:25 PM
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Garage
Stock fork spring rate...................0.700 kg/mm
Stock shock spring rate................ 8.6 kg/mm
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post #6 of 13 Old 09-12-2010, 07:17 PM Thread Starter
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Stock fork spring rate...................0.700 kg/mm
Stock shock spring rate................ 8.6 kg/mm
Thank you sir
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post #7 of 13 Old 09-15-2010, 09:08 PM Thread Starter
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In case anyone is interested, my suspension tuner put the stock springs on the dyno today. As I stated earlier, progressive springs have a "range" of rate. In our case, they start at about .70 kg/mm and end up around .80 kg/mm. The problem is that it takes a lot of compression before the spring gets to the .80 (or even .75) rate. By that time, there is so much momentum built up during that travel that the force can easily still bottom out the fork.
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post #8 of 13 Old 09-15-2010, 09:14 PM
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So what are you planning on going with and if you don't mind what do you weigh geared up? :beatnik:
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post #9 of 13 Old 09-15-2010, 09:27 PM Thread Starter
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So what are you planning on going with and if you don't mind what do you weigh geared up? :beatnik:
Modified (cut) stock springs to save a few bucks:
https://www.stromtrooper.com/dl650-sp...tml#post607493

I weigh 220lbs in my birthday suit and will be riding the bike offroad some (and beat up pavement and gravel a lot).
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post #10 of 13 Old 09-15-2010, 09:40 PM
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So if you cut the stock springs do you need to extend the spacers? Went with straight-rate sonics on a Vee and a heavier rear spring. Not state of the art but a definate improvement particularly off pavement. Similar bodyweight.
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