FREE Suspension Setup advice from an expert

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roadracerx said:
@Colmn did you remove the spring to measure the free length? The springs are never the exact length they are supposed to be. What I mean is a 1092 spring could be 171 or 169 mm, they are all different.

From you post above it sounds like you have 18 mm of BIKE sag when you are at 15 mm of preload on the 1092 Ohlins spring which has a rate of 85 N/m, is this all correct?

The shock spring is too soft for a 200 lbs rider. Do you have a 90 or 95 available? If so, I would likely start with a 95 N/m spring of the same type: 1092 with 11 mm of installed preload.

Your target should be 30 mm of rider sag and 10-12 mm of bike sag.
Click to expand...

No I didn't remove the spring to measure, just trying to wrap my head around the concept of it. Ducati Omaha chart said I should have been fine with the 85N/m, so that's why I was concerned. If I were 20 lbs lighter it still would be 15 mm of preload to get 18mm bike sag, so I was assuming something was wrong. Especially if 16mm is the max amount of preload that should be used
 
bp_SFV4 said:
Ducati Omaha's chart isn't accurate in my experience. I'd go with roadracerx's recommendation.
Click to expand...

Definitely going with his recommendation. But I would like to understand the process for the future. Reading through the old 469 shock manual it says to use 17 mm of preload for setup. But I've read in this thread a few times that preload should be between 10 and 16.
 
Anything more than 17 mm of preload and you run the risk of coil binding. This is what the coils of the spring touch each other.
 
@Colmn while I understand wanting to know the process of suspension tuning, it takes quite a lot of time for me to assist people and teaching people how to do what I do on top of helping is double-difficult. Lots of people on this thread have been helped so you are in good hands and if you are local to SoCal you can even come to my shop and you will get even better results! :)
 
Colmn said:
Definitely going with his recommendation. But I would like to understand the process for the future. Reading through the old 469 shock manual it says to use 17 mm of preload for setup. But I've read in this thread a few times that preload should be between 10 and 16.
Click to expand...
The value the manual gives is really only if you have the shock off. IIRC, you measure the fully uncompressed spring (off of the shock) then subtract 17. When you reinstall it, you tighten the collar until you get to the fully uncompressed value minus 17.

The static (bike) preload most people give is how much the bike droops under its own weight. You would fully extend the rear shock, which can easily be done by lifting it by the rearsets while standing on the kickstand side. Have a helper measure from the top 12 o-clock position of the axle to a point straight above on the bodywork. It helps to have a piece of tape as a reference point. Note the fully unloaded value (A). Stand the bike straight up and measure again. Note the value (B). A - B = static (bike) sag. You can also average it out more by lifting the rear then letting it settle and measuring and pushing down on the seat, letting it settle, and measuring and averaging out these measurements and subtracting that average from the unloaded value but to me it seems a little pedantic.

Rider sag is the greater thing to focus on.
 
Last edited:
roadracerx said:
@Colmn while I understand wanting to know the process of suspension tuning, it takes quite a lot of time for me to assist people and teaching people how to do what I do on top of helping is double-difficult. Lots of people on this thread have been helped so you are in good hands and if you are local to SoCal you can even come to my shop and you will get even better results! :)
Click to expand...

Definitely appreciate what you're doing on this forum. I'm on the east coast. 1st trackday on this new setup today. Flat linkage and heavier spring will be ordered before the next
 
roadracerx said:
@X15b what is your bike and rider sag? What tires are you running on the bike? What other changes have you made to the bike?
Click to expand...

Rear rider sag is according to Dave Moss' suggestions. Front is was good stock, but I've been chasing not bottoming out without any regards to sag. Feels like it's not enough anymore now.
No ther modifications at the moment.
Just supercorsa sp now, i have a set of pirelli slicks for the future.
 
X15b said:
Rear rider sag is according to Dave Moss' suggestions. Front is was good stock, but I've been chasing not bottoming out without any regards to sag. Feels like it's not enough anymore now.
No ther modifications at the moment.
Just supercorsa sp now, i have a set of pirelli slicks for the future.
Click to expand...
Could increase preload or decrease the fork air gap if the only place you’re bottoming is hard braking. Could also adjust riding style if you’re stabbing at the brake. If you’re bottoming out on SP’s, it’ll be more pronounced w slicks
 
X15b said:
Rear rider sag is according to Dave Moss' suggestions. Front is was good stock, but I've been chasing not bottoming out without any regards to sag. Feels like it's not enough anymore now.
No ther modifications at the moment.
Just supercorsa sp now, i have a set of pirelli slicks for the future.
Click to expand...

So what did Dave suggest? Can't help without knowing where you are.,
 
Don't remember, what he set the sag to, rear he took out 4 turns. Front he initially left it alone but now we're at full preload with the 10.5nmm springs.
 
X15b said:
Don't remember, what he set the sag to, rear he took out 4 turns. Front he initially left it alone but now we're at full preload with the 10.5nmm springs.
Click to expand...
Ok, so I am going to go back to my original questions about where your front and rear bike and rider sag are please. Can't help without accurate info.
 
Hey just checking in for some feedback about a pulsing feeling I'm getting from the front under heavy braking. I'm 200lbs in gear. 2016 959 fork have nix30s with 10Nm springs. Rear is the ttx that came stock on the corse with 85Nm spring. Pirelli Rosso Corsa 4 at 28psi rear 34psi front hot. I think I feel the pulsing through the bars, not the lever, but not 100% sure. Abs is on the lowest setting. I'm a hair under 10 cm from bottom. I tried taking out a turn of preload. It got a little better but I hit bottom. Did not have this sensation on stock forks, but I'm also riding on new pads, tires and forks so I have no idea where to even start. Any info is appreciated
 
SuperDomestique said:
Could increase preload or decrease the fork air gap if the only place you’re bottoming is hard braking. Could also adjust riding style if you’re stabbing at the brake. If you’re bottoming out on SP’s, it’ll be more pronounced w slicks
Click to expand...

can we amend the thread title

FREE Suspension Setup advice from an expert...... or a numpty, choice is yours!​


;):cool:
 
Colmn said:
Rear 17mm preload, 8 clicks rebound, 13 clicks compression
Front 6 turns of preload ,14 clicks rebound 16 clicks compression
Click to expand...

You are getting pretty close to the limit on the installed preload on the shock spring. What is your bike and rider sag front and rear?

It is hard say what is causing the pulsing issue at the front of the bike without seeing it or more information.
 
andyb said:
can we amend the thread title

FREE Suspension Setup advice from an expert...... or a numpty, choice is yours!​


;):cool:
Click to expand...

Haha! Great addition to this thread. So much great information right here. The irony and hypocrisy must be totally lost on Andy
 

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