Quote:
Originally Posted by moto27
I have this from good authority, albeit Im 190lbs,
forks to line #2 or 3. Set preload at the middle, compression on 6 and rebound on 8. Leave the shock in the low mount, high speed 1, low speed 3, rebound 8
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Quote:
Originally Posted by AMRRA12
Guys there are no magic #s every one rides at there own skill level and has there own style of riding
All you can really do i's set sag, base line your comp and rebound and go from there
a good Base line i's
Set comp and rebound to the middle
Except on front rebound (we all know how off it is)
Set that at 9
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+1 for what AMRRA said.
"Setting preload at the middle" doesn't have any real meaning unless it's in the context of a suspension developer saying "start with 6 turns of preload for your weight and these (xx rate) springs, which would be based on his knowledge of the specific bike/fork/spring rate/rider/use combo.
40mm fork sag is a good starting point for a street-use bike with 120mm of front travel, and which has a short top-out spring (which the BMW does have). On an RC51, for comparison, the sag setting might be a little larger due to very long top-out springs.
On a bike with Ohlins forks, the target sag might be 40mm on a racebike due to increase travel available (130mm) and the fact that the Ohlins forks use longer, softer top-out springs. If you wind in a bunch of preload to try for 35mm of sag, you might override the top-out springs with main spring tension and you end up ruining the top-stroke ride quality (when the bike is accelerating). With the Ohlins forks, it's better to keep the ideal sag and preload and to correct with spring selection.
When selecting your base sag target, you start by factoring use - more sag to allow for dips/potholes which require a larger amount of extension to handle correctly, and you also want an appropriate corresponding rear sag value to maintain the bike's geometry (usually about 30-35mm rear for 40mm front).
With the shock, the ideal is the get the target sag while still having 6-8mm of free sag. If you have to use a lot of preload to get the target rider sag, you may end up with no free sag and the rear suspension will not work well at full extension. In this situation, you should have the rear spring replaced with a stiffer spring. In the free sag is correct and you cannot get enough sag, you may need a softer rear spring.
The general target for street is ~1/3 of total travel.
Rebound is set after sag because preload will affect rising rate (rebound). Compression is set for plushness vs chassis pitch control.
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