Suspension advice - Ducati.ms

1day · May 2nd, 2010, 10:57 am

Hello fellas,

I have been reading through the threads on Sag and Suspension settings trying to find an answer and I'm more confused. I see a lot of people set the Sag up on the Hyper a little different than on sport bikes due to the longer travel...but why?
With the tech rferences I have found, I'm thinking of setting mine up (with me on the bike---135-140lbs with gear) with 35mm up front and 32mm in the rear. Then just dialing in the rebound and dampning as I see fit. How does that sound? Am I way off with that as a starting point?
Not looking to live on the track, but I do ride a lot in the canyons.
Oh yea...I have 09 1100s (just for reference if those K's up front need something different).

Thanks!

Decreasing Dave · May 2nd, 2010, 11:05 am

Static sag is supposed to be set up at 1/3 the travel so that the suspension is at the beginning of its most usable range.

Dave

Revelstoker · May 2nd, 2010, 3:47 pm

Quote:

Originally Posted by 1day

Hello fellas,

With the tech rferences I have found, I'm thinking of setting mine up (with me on the bike---135-140lbs with gear) with 35mm up front and 32mm in the rear. Then just dialing in the rebound and dampning as I see fit. How does that sound?

Thanks!

At 135-140lbs, you might have a problem even getting the 35.

Check out this video http://video.yahoo.com/watch/6283353/16305651 as it seems the bike is sprung more for a rider in the 180lb range.

cornerhungry · May 2nd, 2010, 4:56 pm

at what point is dave from ott recommending a new spring ?

why cant he just adjust the preload out to get the numbers ?

sorry , don't have a hyper , but the suspension stuff intrigues me.

jboothe · May 2nd, 2010, 4:59 pm

Quote:

Originally Posted by 1day

Hello fellas,

I have been reading through the threads on Sag and Suspension settings trying to find an answer and I'm more confused. I see a lot of people set the Sag up on the Hyper a little different than on sport bikes due to the longer travel...but why?
With the tech rferences I have found, I'm thinking of setting mine up (with me on the bike---135-140lbs with gear) with 35mm up front and 32mm in the rear. Then just dialing in the rebound and dampning as I see fit. How does that sound? Am I way off with that as a starting point?
Not looking to live on the track, but I do ride a lot in the canyons.
Oh yea...I have 09 1100s (just for reference if those K's up front need something different).

Thanks!

I did a lot of research on this as well and decided to compromise with about 40mm up front and about 35 in the rear. I am about 155 lb with gear. Seems to have worked out ok.

You don't want to little sag or your suspension will be too hard and won't follow the pavement very well. Too little and you will bottom out. That why it is recommended to go with about 1/3.

1day · May 2nd, 2010, 8:49 pm

Thanks everyone!

jboothe,

When I started doing my measurments I found that it was set at 22mm in the rear and about 30 up front. With the factory rebound I noticed that with that little of sag I was skipping along the rough stuff in the corners...un-nerving just a bit.

With the advice from "Decending Dave", it is making a little more sense to me now. My habits and advice on other sportbikes was to shoot for a general number and go from there. Shooting for the 1/3 of travel makes the higher front sag number make more sense now.

The only thing that still confusing to me is the fact that the front travel is more than the sportbike setup therefore the sag is set accordingly, but the rear is basically the same...Now to get the front and rear to work together, are you guys having to set the rebound and damping up so that the front can travel the longer distance quicker in order to keep in step with the rear's shorter travel?? Or am I thinking way too much about this?

jboothe · May 2nd, 2010, 9:06 pm

This is a good guide that someone posted before: http://www.ohlins.com/Products/Owner...M_07241-02.pdf. It gives a good explanation on preload, sag, compression/rebound damping and how it all works together.

freezer16801 · May 3rd, 2010, 11:36 pm

Quote:

Originally Posted by 1day

Thanks everyone!

jboothe,

When I started doing my measurments I found that it was set at 22mm in the rear and about 30 up front. With the factory rebound I noticed that with that little of sag I was skipping along the rough stuff in the corners...un-nerving just a bit.

With the advice from "Decending Dave", it is making a little more sense to me now. My habits and advice on other sportbikes was to shoot for a general number and go from there. Shooting for the 1/3 of travel makes the higher front sag number make more sense now.

The only thing that still confusing to me is the fact that the front travel is more than the sportbike setup therefore the sag is set accordingly, but the rear is basically the same...Now to get the front and rear to work together, are you guys having to set the rebound and damping up so that the front can travel the longer distance quicker in order to keep in step with the rear's shorter travel?? Or am I thinking way too much about this?

most likely the front forks will be way over dampened for you. I am 210 lbs naked on the bathroom scale. I have 5 weight fluid in there instead of the 7.5 and I have the compression all the way out. The rebound is about 1/2 to 3/4 full stiff. I also had to install .90 kgs springs.

One way to look at the spring requirement for these forks is to imagine a cross between a motorcross fork and a street bike. According to racetech, springs for my weight for a Suzuki 450 are .497kgs . Racetech recommends .10 kgs for my R6 track bike. The length of travel for each bike is drastically different as well.

The hyper comes stock with .68 kgs. Springs are somewhere in the middle and so is the travel length.

The rear shock is much closer to normal streetbike standards. Mine is set at 35 mm after being resprung and valved.

JFB1973 · May 4th, 2010, 2:19 am

Sorry for stealing the thread but I have questions of my own regarding suspension.. ( better than opening a new thread )
I have the regular HM not the S.
- the owners manual says that the rear suspension is of the progressive type, is it due to the set up or is the spring rate of a progressive type?
- will increasing the Preload on the shock make the bike stiffer? ( the set up being of a progessive type )
- Increasing the preload won't increase rear height?

Thanks...

Decreasing Dave · May 4th, 2010, 6:07 am

JFB,

The same rules apply. You need to set your sag the same as with the "S".

Yes, the increase on the preload will make the bike stiffer. For example, you can use this when you carry a passenger on a ride vs. going by yourself.

Yes, the increased preload will increase the ride height. But not in a good way as you are effectively taking the suspension out of it's most usable zone by cranking on the preload for an increase in ride height. This should only be used when adding weight like a passenger (see above) or luggage. If you feel the need for added ride height, you should invest in the adjustable linkage.

I hope this helps.

Dave