View Single Post
Old 07-25-2010, 01:46 PM   #17
Gangplank OP
Advenchaintourer
 
Gangplank's Avatar
 
Joined: Jul 2003
Location: Las Vegas
Oddometer: 2,294
Quote:
Originally Posted by -W-
"I was also thinking of changing first [the] whole forks to WP's, but [a friend who is helping me with the project] said that there isn't any need to do that if you can "Shiver original ones". Reason why people doesn't necessarely like original Shiver forks is the amount of preload and way they have been usually valved by the factory - and he was right.

Personally I wouldn't change these [RXV Shiver'd] forks now for stock WP forks. I have ridden one 990 Adventure and those forks aren't as good as stock as these Shiverred & revalved are. Those WP's would need to have more stiffer springs and revalving to be better or same than these are.

It is a great mod (and relative cheap now when we know what we have to buy for conversion - I had to bought couple of different kind of forks to find the right parts -> my conversion wasn't cheap but it is still worth of every penny), but only if you revalve them by some professional guy who really knows what he is doing. Just don't save on revalving, that is my advice;)

And remember to drill a hole for oil to that spacer (there is a small hole in the damper rod and there has to be maching hole at the spacer too). And also drill&tapper a hole for lock nut to the spacer to keep it at it's place. Mine has M4 locknut.
Quote:
Originally Posted by -W-
Right spring rate depends what do you want from fork compared to original one, how long travel you will have (stock 230mm or more?), how heavy you are and what kind of riding do you do.

If we compare spring rates from "similar weight / kind of bikes"..:

1. KTM 990 Adventure has 0.49 springs in stock model which has less travel than F800GD and weight 15 kilos more. S-model has 0.48 spring because it has more travel than stock model and also more travel (15mm) than F800GS.

2. KTM 950 Superenduro has 0.59 springs and has much more travel than F800GS (255mm - 25mm more than F800GS. It weights the same than F800GS but it has been built to be used as a real dirtbike - suspernsion is therefore real stiff and [some say] bit too harsh for most of the users.

Now you can ask you self that are you going to ride with your F800GS more harder than Superenduro is built to be ridden..? I don't thinks so, so why to have then stiffer springs than Superenduro has? Stopping of bottoming your fork is meant to be done by adjusting your forks oil level and base valve, not by putting some over stiff springs.

Then again you might try 990 adventure and see how you like it's front fork? I felt it was a bit too soft for my riding style (I propably sometimes ride much harder than F800GS is originally meant to be ridden or normal 990 Adventure and sometimes also in very highs speeds at gravel roads).

So I would say go or those 0.50 springs you already have if you aren't too heavy your self, you don't ride trails with head size rocks, you like plush ride and you aren't that much of the "spin the wheel guy".

If you like to fly through rock gardens, sprin the wheel at gravel roads at high speeds (80-140km/h), or you are heavy guy go for the Íhlins 0.55 springs. Then if you want to have "bullet train" for extremely rough roads and trails and/or you are a big guy go for the 0.60 Bitubos.

But in the end you should measure the race sag etc from your bike when you are on it, decide the correct preload and then calculate the spring. It is impossible to say what spring is best for you (because valving and oil level has also big effect to the feeling), but starting with those 0.50 isn't a bad thing since you already have them.
.
__________________
Ride more, bark less

Gangplank screwed with this post 07-25-2010 at 01:55 PM
Gangplank is offline   Reply With Quote