suspension tuning, raising the rear?

[Privateer]

yeah, i paid the $20 and it feels great (well, as good as it can be).  I was only questioning the "increase preload to raise ride height and balance out the front/back."

It seemed counter intuitive to me to use preload to raise the ride height when really I should use an adjustable ride height rod to raise the rear to get the same result without compromising the preload settings.

He wanted to do it himself but it's a pain in the ass to get to the adjusters because of my rear shocks reservoir.

[BK_856er]

Then I don't get it.  It feels great, but you don't trust your tuner?  Maybe you should find a new tuner that you trust?  Sometimes tweaks need to be made that might seem counter-intuitive, but it sounds like the guy was simply trying to make the best of the current setup before recommending new parts.  An adjustable rod is a good investment and every monster should have one, especially if you've already gone to the trouble of replacement forks/shock.

BK

[stopintime]

..........  I was only questioning the "increase preload to raise ride height and balance out the front/back."
............

With the numbers you've got now, I'd say it's a bad idea to increase preload.
If, on the other hand, your sag was much deeper - then fixing that would also raise your ride height.
Maybe that's what he was thinking....

[devimau]

Your comment may be relevant, or not, depending on how high those slab joints are.  Around here, we soften up compression damping to reduce the bumps we get from the slab.  The 620 does not have compression or preload adjustment on the forks.  Raising rear height may be something he needed to do anyway, but it doesn't address his initial complaint.


You're mixing two different things, compression damping and air spring, the two of them have different roles on an hydraulic system.
Those "slabs around there" will have to be as big as a motocross track woops in order for the oil level to play a role in that ecuation.
Anyways, I'm in LA area, that's my "around here", the 405 "king of slab joints area....."

[devimau]

OK.  Measured the rear today.

Static sag, 30mm
Free sag, 4mm

I have about 7mm of thread showing above the preload adjuster.

you mean 30mm rider's sag and 4mm static.....

how much preload you have (amount of mm the spring is compressed, if the free length is 120 mm and it measures 100 installed then you'll have 20mm preload)

I usually start @ 10mm static and 30mm rider, by those numbers IMMO your spring is weak since if you reduce preload to achieve 10mm static your riders will be around 35mm, just some inputs to consider.