I read a comment in this thread on pre-load and ride height. So here is a a $.01 of my $.02 on that...
I have run Elka's for many years now. Frankly they are one of the most knowledgeable and "Client" friendly shock companies I ever worked with. Keeping in mind most of my experience was with them on our ATV's and off-road Bikes.
These ATV's and Bikes ranged from sand only, or off-road (Dirt rocks etc) only to Flat Track (All types of roads including asphalt). Not to mention serious jumping. Most of the time we could jump the bikes beyond the bike's abilities. So we are pretty good at it.
And shocks are the most important element on the bike with power hot on it's tail.
Anyway.. What does this have to do with pre-load... Well Pre-load needs an engineer to explain it accurately (I am not) but I will give you an idea of it...
Elka designs their shocks to be one of the fastest responding shocks on the market. Getting a dual stage shock (Rebound) is IMHO the only true type of shock to have. This means the shock is not only taking the brunt of the bump, it is also now helping control the bike on the rebound portion of the stroke.
This is critical. Without this we get a bumpier ride, not to mention a lot of "Wallowing" in the turns.
Why would I mention this in explaining a bit on pre-load? Easy...The shocks are the moving component, the springs are the supporting mechanical portion. The springs kind of take up the slack, and keep things in what I call a safe zone...
This safe zone is... Say a shock has a total of 10" in travel (For easy understanding sake, say 5" up and 5" down) the springs job is to make sure the bike never reaches 5.1" causing a bottoming out effect creating a potential "Disturbance" in the vehicle during normal operating conditions.
So this safe zone under normal operating conditions would be 4.85" and 4.85" respectively. Under extreme conditions we still bottom out.
This is why the pre-load is so important. If we get to soft of a pre-load we bottom out more often. If we get to heavy of a pre-load than we have a bouncy ride.
Keep in mind one very critical item. Anti-Sway bars are just that. While the shock/spring combo has a similar job (To a point) their job is more about the ride quality that the rider is looking for. The Anti-Sway bar is the one keeping the bike on a "Plain" (Trying to keep the center of gravity in a "Zone") allowing the shock/spring combo to do thier part of the job.
So yes... Pre-load can raise the front of your bike depending on the amount of "Pre" we go. The idea of this though is quite simple... Once you load up your bike and sit on it, it should go back to the "Original engineered" position set by the Bike Manufacturer (Or close to it).
Now a properly "Pre-loaded" set of springs combined with properly "Valved" shocks can in many cases eliminate the need to change the Anti-Sway bar. In fact many times the factory shock/spring combos rely more on an Anti-Sway bar than most would think. By going to an after market shock/spring combo many folks now experience a far superior ride because they are actually "Tuned" for your needs and likes.
For example.. This is why quite a few members here (Including myself) have cranked our pre-loads up on our RT's.. Trying to help the ride quality. Not to mention the Anti-Sway bar for many is to weak for windy road environments (Like mine) amplifying this need to adjust.
So here is what I learned over the years on how to know what to get for a pre-load set of shocks/springs for our RS/RT's.......
- Dual (Rebound)(Sometimes depending on application this includes an external reservoir)
- For excessive heat conditions/environment, the option of an external reservoir
- Weighing the front of the bike in the loaded condition it will be in 80%+ of the time, knowing my "Geared up" weight and dividing by three. So ... In my case.. the front of the bike weighs 600lbs. I weigh 250lbs with all my gear on, wallet, cell, Pistol etc.. This totals 850lbs. Divided by three = 283lbs. (This is not how I do it for light vehicles, I then go by my weight plus 25-50lbs for the pre-load #)
So as you can see from what I have personally experienced... I would have called up Elka told them I need a set of 283lb preloaded springs and dual stage shocks. They then would have told me we have 275lb or 300lb. I would have taken the 300lb.
Why? Because I like to be safe and have more than less, not to mention the wife being on the bike (Although most of her weight would be in consideration of the rear shock) and in our neck of the woods it does rain a lot, so the "Water" would add to the weight of everything.
Good Lord I hope this makes since and helps someone. nojoke Remember... I am just a person that has tried many of their shocks. I am in no way an expert. We all find ways to make our "Shopping" needs easier and this was mine in regards to shocks/springs :2thumbs: