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-   -   Softly Softly - Spring rates (http://forums.sv650.org/showthread.php?t=105823)

Blue_SV650S 03-03-08 01:38 PM
Softly Softly - Spring rates
 
I have a 2001 SV 650

I have some forks from a 2001 600 bandit (I believe).

How can the bandit only have 0.45kg/mm springs? SV has 0.7kg/mm

http://www.racetech.com/evalving/menu/searchstreet.asp

Blue_SV650S 03-03-08 03:22 PM
Re: Softly Softly - Spring rates
 
Oh and an SV is 165kg Dry

A 2001 bandit is 208kg dry ...

The bandit fork tubes are 31mm longer ...

Blue_SV650S 03-03-08 04:46 PM
Re: Softly Softly - Spring rates
 
Hello ... anyone there?!!? :D

Look, the more I think about it, the more something isn't right :scratch: -

So lets look at it another way; If you can generate enough grip from the front, you should be able to generate about 0.9g of braking effort. At that point, the back wheel is lightly touching the ground, so 90% of the weight is transfered to the front. If the bike and rider weighs 300KGs, the front forks are supporting 150 * 0.9 each, or 135KGs. At a rate of 0.454KGs/mm, that will compress the forks by 297mm, or nearly a foot!

If the forks have 6" of travel, they would bottom out at a braking force of 0.45g, which is naff-all.

This is with a ~200kgs fuelled up bike and ~100kgs of rider. We all know that most bandit riders are well in excess of 180Kgs... :D

Wild Bill 03-03-08 05:11 PM
Re: Softly Softly - Spring rates
 
wha!

northwind 03-03-08 05:26 PM
Re: Softly Softly - Spring rates
 
Sounds like the spring rate info is wrong tbh, or there's some other relevant data missing.

Blue_SV650S 03-03-08 07:17 PM
Re: Softly Softly - Spring rates
 
Quote:
Originally Posted by northwind (Post 1436322)
Sounds like the spring rate info is wrong tbh, or there's some other relevant data missing.
They are progressive springs in there as standard ... I wonder if the .45 is the initial rate?

What confuses matters further is when you put in a rider weight in the calculator/s ;)

Flamin_Squirrel 03-03-08 08:03 PM
Re: Softly Softly - Spring rates
 
Quote:
Originally Posted by Blue_SV650S (Post 1436438)
They are progressive springs in there as standard ... I wonder if the .45 is the initial rate?
Well if it's progressive then it certainly isn't the whole rate ;)

That said, SV springs are progressive either. At least I seem to remember the pointy ones are.

Blue_SV650S 03-03-08 08:09 PM
Re: Softly Softly - Spring rates
 
Quote:
Originally Posted by Flamin_Squirrel (Post 1436513)
Well if it's progressive then it certainly isn't the whole rate ;)

That said, SV springs are progressive either. At least I seem to remember the pointy ones are.
I'd expect 2 rates to be given for a progressive else it is meaningless!!! ... but perhaps I expect too much!?! :D

Dunno about pointy, but the stock curvys are NOT progressive ...

Blue_SV650S 04-03-08 09:42 AM
Re: Softly Softly - Spring rates
 
Slung the bandit forks in my road bike this am ... who wants to know the results?!?!? ;)

Alpinestarhero 04-03-08 10:17 AM
Re: Softly Softly - Spring rates
 
ok, tell us all


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