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GS1150 cheap rear shock upgrade

  • Thread starter Thread starter Big_T112
  • Start date Start date
LeeGS550E said:
Any idea how the Ducati's spring rate compares to the stock spring?

I searched around but never found data on the stock spring rate for the shock on my 550. It would be cool if anyone had any info on the stock spring rates for the mono shock bikes.

Right now I'm using the 550 spring on a 200x gsxr shock body. Seems to work pretty well. The gixxer spring was waaaaaayyyyy too stiff.
Click to expand...
My guess - note guess - is that the Ducati's spring rate is stiffer due to the shorter length and thicker coils. With the GS spring installed and the preload adjuster almost all of the way out the GS750 rear felt pretty good by sitting on it and jumping on the pegs. I'll get a chance to ride it hard next time I'm in Chicago.

The old GS shock was complety worn out so this is a fairly decent and CHEAP upgrade.
 
So, to recap, what is the verdict on what fits on a GS1150? Will a CBR929 shock work?

-KR
 
900

900

I have only used the ones from 900RR's and they work great
 
Big_T112 said:
I have only used the ones from 900RR's and they work great
Click to expand...
The Works Performance Applications Guide lists the 900RR shock as 12.6" in length where the GS1150 is listed as 13". Did you notice any difference?
 
That's what I thought... but I bought a 900RR shock as i saw one pretty cheap on Ebay & it is 300mm so now I am confused with either what I bought being wrong or what Big T thinks is a 900RR isn't...

The 900RR shock has compression damping on it & a cylinder so prob a better shock than the Ducati all told.

Here's some pics of the Duc shock fitted on my build thread http://www.thegsresources.com/_forum/showthread.php?t=149334

Dan :)
 
the 900 RR

the 900 RR

The 900 rr shock may be a bit shorter but it is stiffer and holds the bike up better. there is a lot less sag than with the 1150 shock. trust me it's a lot better.
 
Big_T112 said:
The 900 rr shock may be a bit shorter but it is stiffer and holds the bike up better. there is a lot less sag than with the 1150 shock. trust me it's a lot better.
Click to expand...
It's better than the stock 1150 shock, but I doubt it's better than the Ducati unit that IS 13". Sag is a setting that you can adjust with preload and the right springs. If you want a lower rear get the 900RR unit. Personally, I don't want a lowered bike. It's all up to personal preferences.
 
lower

lower

Yes I did not factor that in. I did want my bike a little lower but with the RR shock it still sat higher than wheb I sat on my 1150 shock. it did not go down near as far. I found it to have a superior ride.
 
I wish I'd known it was shorter at the start... I really don't need mine lower as the wheel swap is already costing me clearance. :)
 
Big_T112 said:
Yes I did not factor that in. I did want my bike a little lower but with the RR shock it still sat higher than wheb I sat on my 1150 shock. it did not go down near as far. I found it to have a superior ride.
Click to expand...
I doubt if it sat high without a rider. With a rider, if you dropped that much then your spring is wrong for your weight, or your preload isn't adjusted correctly, or both.

With the 900RR the rear will sit lower due to the length of the shock being shorter. Stiffining up the spring isn't the answer to compensate for a shorter shock unless you want a lower rear to begin with. It sounds as if you do.

Now, if you lower the rear, you really should lower the front accordingly or you screw with the bikes geometry. If you lower both the front and rear then you loose cornering clearance.
 
salty_monk said:
I wish I'd known it was shorter at the start... I really don't need mine lower as the wheel swap is already costing me clearance. :)
Click to expand...
Get the Ducati shock then. You can even swap the GS spring to the Ducati shock (it fits) if the GS spring rate is good for your weight. They are decent shocks for cheap.

The are two problems with this arrangement - depending on what you classify as a problem.

1) You need to do some trimming on the top (bottom) shock eye for clearance. (The ducati shock must be mounted upside down). This is pretty minor stuff.

2) Since the Ducati shock is mounted upside down it has the potential for road crud to accumulate around the piston seal. This can be dealt with by using the stock GS dust cover, so it's not really a problem at all, just a warning.

Again, this is about the closest shock you'll get as far as length goes and it's a heck of a lot better than forking over a few hundred for aftermarket. If you have the money get a Works (or similar), they are superior to the stock Sachs unit, but they come with a price.
 
As above:

Here's some pics of the Duc shock fitted on my build thread http://www.thegsresources.com/_forum...d.php?t=149334

I already had the Ducati shock on the shelf I just also wanted a look at the CBR shock so I bought one of those as well. Had I known it was shorter I wouldn't have bothered.

The Ducati Shock has a shorter stroke so I expect a little less rear travel. I am trying the Ducati shock (on a 750) as my GS spring was soft. (Previous owner was a BIG guy).

With the Ducati spring you can't use the dust cover. I figure if this one works well I'll just hunt out a spare but the lip seal on the shaft should be pretty good at keeping crud out....

I did have to "massage" the top eye a little, basically just removing the split line where it was cast.

Dan :)
 
salty_monk said:
As above:

Here's some pics of the Duc shock fitted on my build thread http://www.thegsresources.com/_forum...d.php?t=149334

I already had the Ducati shock on the shelf I just also wanted a look at the CBR shock so I bought one of those as well. Had I known it was shorter I wouldn't have bothered.

The Ducati Shock has a shorter stroke so I expect a little less rear travel. I am trying the Ducati shock (on a 750) as my GS spring was soft. (Previous owner was a BIG guy).

With the Ducati spring you can't use the dust cover. I figure if this one works well I'll just hunt out a spare but the lip seal on the shaft should be pretty good at keeping crud out....

I did have to "massage" the top eye a little, basically just removing the split line where it was cast.

Dan :)
Click to expand...
Yea, there's a little less travel, but you're not riding the dirt. How much travel do you need? :)

For the money I don't think there's a better alternative out there.
 
:lol: I'm not concerned just stating for "full disclosure". I'd hate for someone else to get a surprise they didn't expect.

It will be magnified by the link so I expect to lose at least a quarter of the travel, I don't see that as an issue but some might.
 
They are a lightweight shock meant for a quad... I doubt they'd handle the forces & weight in a mono-shock situation :)
 
salty_monk said:
They are a lightweight shock meant for a quad... I doubt they'd handle the forces & weight in a mono-shock situation :)
Click to expand...
You're absolutely correct. Even if they were able to handle the load they wouldn't fit due to reservoirs.
 
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