GRiSO Öhlins suspension

It made a difference in that I didn't have to run a ton of preload. It just didn't absorb shocks so much as transmit them directly to my backside. It was a very heavy spring and was chosen based on price (cheap, used) rather than some scientific process.

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Further to this discussion - I obtained a clevis mount from Forsaken Motorsports in Canada. Its intended to adapt an Ohlins shock to a BMW 1000RR (pics below). Cost $80. Beautiful item.

Its a long clevis, so when fitted the eye to eye length of my Ohlins shock (see previous posts) goes from about 305 mm to 335 mm, with clevis fully wound in. I note that this about 17 mm longer than the stock GRiSO shock. Would this be too big a jump in ride height?

Haven't fitted it to the bike yet - waiting for a 36/105 spring to arrive later in the week. It will need spacers as the inside width of the clevis is 5 mm larger than on the original, as per the Ohlins clevis.

Stock GRiSO shock should be approx 320mm. Increase it by 15mm ...... with a rocker ratio of 3:1 = 45mm increase in rear ride height ....... excellent for ground clearance and quick steering.

In round figures that will reduce your rake by approx 1.5 degrees

DON'T DROP YOUR FORKS TO THE 6TH RING!

Not unless you want a 22.5 degree rake with reduced trail.
Hope you got long legs.

Thanks Ghezzi - that's good to know & great advice. Fortunately I'm not vertically challenged so the increase in ride height won't be a problem. I'll report back once I get it on the bike. Can't wait...

I started with my Bellagio at 28* rake. Yours is 24.5*

I Raised the rear 60mm and dropped the front 30mm which netted me approx 3.4 degree reduction in rake. (now 24.6*)
However I did it in stages, plotting the numbers as I went.

My reason for fitting a Multistrada front end was the Ducati triple clamps have 29mm less offset, thus adding to my trail which had dropped to 77mm.
Another bonus, all these mods reduced my wheelbase by 50mm.

I'm saying be careful, be very careful. If you don't know the numbers, or worse, if you don't understand the ramifications of the wrong set of numbers, somebody could get hurt.

Thanks - I appreciate what you are saying, based on your extensive experience. I will evaluate it cautiously and most certainly won't be backing off the front preload. Cheers.

Mind you, Ghezzi made this statement in an earlier post:

".... had a few head knocks along the way. Last count was fall down go boom 26 times."

Sounds like he's got at least a little experience.

Can't tell a piano fell on me when I was a kid!

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Waterbottle,

Tell us about the Ohlins clevis pin you used, was it the long or short clevis you used ?

What spacers did you have to make up ?

Nobleswood, I can take some pics and get back to you tomorrow. Basically just washers were used as spacers, and a couple of tricks too . Later, beer drinking in progress .......

Later, beer drinking in progress .......

So the plumbing is fixed then?

Il GRiSO wrote:

Due to my current influenca, I've had plenty of time for googling in the net for rear suspension for my GRiSO 1200 SE.

On the homepage of the German tuner "DÄS" I found the Öhlins TTX 36 for the GRiSO.

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Not cheap, but Öhlins seems to be worth for a more sportive setup.
Has anybody experience with the Öhlins TTX 36?
Does it fit to the GRiSO w/o modifications?

Waking this thread….
I’ve been looking at all my options to upgrade the rear shock on my GRiSO 1200 SE.  The Ghetto has a wealth of information, and has swallowed many many hours of my time on this subject alone

I’ve wondered about the TTX, and have some questions for our gurus.

This shock is a used TTX, and has a suitable 25mm Clevis, I believe that’s a

[TTX images deleted… cos this one just won’t fit, it would be at least 4mm less than OEM]

The above image shows an adjuster on the left side.  Is this for remotely setting the Spring’s Pre-Load?  
What’s available to use this remote?  Breakers?

Finally and possibly more important, it is currently 310mm in length, which is at least 8mm less than needed for the GRiSO.  
Can it’s length be increased?  Maybe a spacer??

Bob

I have mounted it. Okay it is very expensive but the difference to the stock one is like night and day.
May main motivation was comfortable riding because the streets here in in northern Germany are often in a very bad state (various layers off tarmac). With this shock you have a much smoother ride.



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Mine has the same length as the stock one: 320 mm, but this can be changed too.
Before you buy it at Däs-Motoec you have to tell them how to the setup should be done e.g.
- driving style
- usage (road, track, with passenger, etc.)
- rider's weight
- setup style (e.g. soft or hard)

Hey Bob, let me know if you want to borrow a Matris to try out (I'm running Stelvio OEM std & it works so won't be using the Matris any time soon) - it's adjustable to slightly longer than stock & I've got several spring options you could put on it. It does have old fashioned (crap spanner) pre-load adjustment.

janguzzi wrote:

I have mounted it. Okay it is very expensive but the difference to the stock one is like night and day.
May main motivation was comfortable riding because the streets here in in northern Germany are often in a very bad state (various layers off tarmac). With this shock you have a much smoother ride.

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Mine has the same length as the stock one: 320 mm, but this can be changed too.
Before you buy it at Däs-Motoec you have to tell them how to the setup should be done e.g.
- driving style
- usage (road, track, with passenger, etc.)
- rider's weight
- setup style (e.g. soft or hard)

Jan,  thanks I had found & subscribed to your YouTube channel
I’ve browsed over that page on the Daes-Mototec.de site.  If money were no object then it would be a fantastic choice.
Unfortunately in my world, money matters and I couldn’t possibly justify that. Especially considering all the other item that would demand… Ohlins front end, radial brakes, carbon wheels etc etc  ££££

My solution is to locate the best parts from the used market.
I’ve seen the above TTX shock, ex-BMW S1000RR. I know the Clevis @25mm is likely a little wider than, but spacers can sort that (posts by Baross).

1. My questions were regarding the length of the shock I’ve seen being 310mm. Somewhat short. Can it be lengthened?

2. Pre-Load Remote adjustment. This doesn’t come with one, can one be obtained?

Bob

I’m looking at a shortened shock from an Aprilia RSV4 RR. As others on here, Baross, Waterbottle, it will need a ‘Clevis’ to convert the lower end. As this shock is already lowered will a Clevis increase it?
Who sells Clevis & what sizes available?

Bob,

I installed an Ohlins model AP 8271 (called a good solid workhorse shock by the guy who serviced it the second time ) from a 2009 Aprilia RSV4 1000R. Shock length was shorter than I needed, can't get to the numbers at the moment as I'm away from my computer, but as I was sending it to Ohlins USA for servicing they changed that when they had it apart.

The technician did say that the OEM Ohlins shocks have the clevis & shaft machined so that you can't easily take the two apart.

My experiance was that the season after I installed it the new seal was blown. Apparently the first time round the tech had not removed or sanded down a rust pit on the shaft & it tore the seal.

Hopefully there's a suspension place near you that can take care of that.

Nobleswood wrote:

Bob,

I installed an Ohlins model AP 8271 (called a good solid workhorse shock by the guy who serviced it the second time ) from a 2009 Aprilia RSV4 1000R. Shock length was shorter than I needed, can't get to the numbers at the moment as I'm away from my computer, but as I was sending it to Ohlins USA for servicing they changed that when they had it apart.

The technician did say that the OEM Ohlins shocks have the clevis & shaft machined so that you can't easily take the two apart.

My experiance was that the season after I installed it the new seal was blown. Apparently the first time round the tech had not removed or sanded down a rust pit on the shaft & it tore the seal.

Hopefully there's a suspension place near you that can take care of that.

Thanks, there is KAIS Performance, a UK Ohlins specialist about an hour away, near Manchester.  Hoping to speak to them further, now I’ve got more from seller. They quoted £180 for a full service incl seals.

• I’m just off phone.  Apparently this shock has a length of 314mm. There are also internal spacers that can achieve a few more mm.  I’ve read 318mm as standard OEM shock length, can anyone confirm this?
  

Bob

Measured on my bike the Sachs shock had an eye to eye length of 319mm.

The installed Ohlin has a measurement of 328mm

Rather than internally reduce the stroke of the shock I'd find the longer clevis if possible

I ended up changing the spring from the 01091-31/95 to a 01091 -34/100 to get the sag setting where they should be. I weigh with gear about 90kgs

Nobleswood wrote:

Measured on my bike the Sachs shock had an eye to eye length of 319mm.

The installed Ohlin has a measurement of 328mm

Rather than internally reduce the stroke of the shock I'd find the longer clevis if possible

I ended up changing the spring from the 01091-31/95 to a 01091 -34/100 to get the sag setting where they should be. I weigh with gear about 90kgs

When you removed the bottom ‘eyelet’ from the Ohlins shock, was the replacement ‘Clevis’ a standard Ohlins part?  
Do you know whether there are alternative sizes of the Clevis?  Your Clevis was about 9mm longer than the OEM eyelet.

I have confirmed the the current RSV4 and Tuono V4 have the same shock length of 320mm, same as yours?  I would love to acquire the Maxton, that I’ve been watching (at a low price) due to it being a race spec shock with fully adjustable compression & rebound, to me seems akin to the Ohlins TTX.  It has been built as a 20mm lower shock, as such it’s likely to be made with shortened internals. I’d need 25mm from a Clevis, not 9mm.
My saga continues..

Bob

Working from memory, so I could be off, I thought Ohlins had 2 standard sizes of clevis & so the technician could just pull one from the shelf & install it.

I’ll have a look in the shed to find the parts

I sourced an early Stelvio shock and fitted a 110 Nm/mm spring from Brook suspension
Not as supple as a modern shock - bbut pretty F good and it has not bottomed in 400 miles

lcjohnny wrote:

I sourced an early Stelvio shock and fitted a 110 Nm/mm spring from Brook suspension
Not as supple as a modern shock - bbut pretty F good and it has not bottomed in 400 miles

Johnny,  what do you weigh?  I’m 115kg, so will need a F off big spring lol.
I seem to recall the Stelvio shock increases the back end, but don’t recall by how much.
It’s strange that a Stelvio’s shock improves upon the GRiSO’s Sachs. Is it the longer travel that helps it?

I intend to have the front sprung and revalved to suit. Have you needed them doing after changing the rear?

• Robinson_Spike posted last year about also doing the forks same, with Maxton
  

Bob

BobW981 wrote:

Johnny,  what do you weigh?  I’m 115kg, so will need a F off big spring lol.
I seem to recall the Stelvio shock increases the back end, but don’t recall by how much.
It’s strange that a Stelvio’s shock improves upon the GRiSO’s Sachs. Is it the longer travel that helps it?

I intend to have the front sprung and revalved to suit. Have you needed them doing after changing the rear?
Bob

Hi Bob
I weight 104Kg in riding gear

The stelvio shock is about 10mm longer than the GRiSO and the shock has around 10mm more travel.

With the Stelvio shock and a 110 N/mm spring fitted (same as 11.2  kg/mm) i get a rider sag of 38mm from a wheel travel of 135mm
(with the standard unit using a 93.2 N/mm or 9.5 Kg/mm i got a rider sag of 35mm from a wheel travel of 110mm).

So the modified Stelvio unit has about 25mm more wheel movement than the GRiSO left before the end of stroke at a higher spring rate.

I see no reason to expect the Sachs damping to be any better quality on this shock than the original - but it does not feel worse.
I plan to upgrade the shock to a better one next year when i get the forks revalved.

Main advantages being 1) the GRiSO benefits from a sharper steering angle 2) The arse end wont bottom out on bad roads or carrying a pillion.

UPDATE
After a few thousand miles i decided that the quality of damping was a bit better on the standard shock than the Stelvio and that i did not like the high seat that the Stelvio brings.
So i have put a 12Nm spring on the standard shock preloaded by 22mm. This feels well balanced with the 9Kgm springs in the front - generally satisfied until i upgrade the shock

My search is complete, and my new shock is NOT an Ohlins.  I’ve been able to buy the RSV4 Maxton I’d seen advertised via eBay.

Big thank you to the Ghetto members on here who’ve given great advice.