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Griso 1100 rear suspension travel - Safety issue !!!

Matias

Tuned and Synch'ed
Joined
Dec 1, 2012
Messages
68
Location
Lisboa, Portugal
Dear all,

I did a small travel last week with my Griso 1100.
I was travelling with full load (me, a passenger and a pair of saddlebags). I incresed the rear spring pre-load and the compression damping because of that.
Nevertheless I think I have used the complete rear suspension travel in a couple of bumps on the road...
When I got back home I have noticed I had a line on each side of the rear tire caused by the contact of the tire with the pins existing on the rear section of the frame to attach the helmet net (see photo attached).
I'm not questionning about the adjustment of the suspension for the weight in question....My question is: shouldn't the rear suspension hit a bump-stop before the tire gets in contact with these pins? I believe with a hard stroke this could result in severe tyre damage, rear wheel blockage, etc....
Has anyone ever noticed such situation?
My rear tyre has the standard size 180/55.

Thanks in advance for your input.

BR,
Matias Moto Guzzi Griso 8v 07  3
 
Yes, anything over a ~77kg load will overload the rear shock and cause bottoming. Upgrade your rear shock and enjoy the bike 110% more.
 
Hi GT-Rx, thanks for your feedback.

I heard before that the rear shock sucks..... But bottoming the rear suspension implies the tyre getting in contact with these pins?... This is a serious design issue...
 
That's some serious movement! I measure 140 mm between the tyre and these luggage points with the bike at rest and minimal preload. Specs say rear wheel travel is 110 mm. That is on a Griso 1200 as per your picture.

You didn't say what the weight of you and your passenger was, plus the "full load". Do you think you might have been overloading the bike just a teenzy bit?
 
Check to see if the bump stop is still there. Will be a hard rubber/resin stop at the bottom of the cylinder inside the spring. If it is gone, then it could send the rear tire that extra 30mm. I am guessing that is what happened. Those stops deteriorate over time, or get damaged and destroyed if there is a hard bottoming out, no matter what type of shock you have. That is their job.
 
Thank you all.

- I'm using the stock tyre size, 180/55.
- My guess is that the total weight on the bike (me, passenger and luggage) would be around 160 kg ( 352 pounds)
- Even though I used a photo from a 1200 8V i picked from the internet my bike is the 1100 4V
- I'm gonna check if thebump stop mentioned by Canuck. I guess if it is not this means a new shock, wright :(?...
 
Thank you all.

- I'm using the stock tyre size, 180/55.
- My guess is that the total weight on the bike (me, passenger and luggage) would be around 160 kg ( 352 pounds)
- Even though I used a photo from a 1200 8V i picked from the internet my bike is the 1100 4V
- I'm gonna check if thebump stop mentioned by Canuck. I guess if it is not this means a new shock, wright :(?...
Either way GT-RX recommended upgrading the shock.
 
Hi guys,

Some updates on this issue...
I took a look at the shock today.
It's not easy to take a good look at the bump stop because the shock is stuck inside the swing arm and linkage system.
But it was enough to confirm what Canuco said....this bump stop is shot....(photos attached)
I'm also sending a photo with the pin marks on the tyre (new tyre...).

I took a look at the link you sent John....These Öhlins shocks really look precious....and they are for sure the best you can get....but they will cost close to 1.000 EUR and I cannot afford to give away that amount right now.

Does anybody know if it is possible to disassemble the original Sachs shock and replace this bump stop?

Thanks,
Matias

20170823 111133 Medium 20170823 111550 Medium 20170823 111925 Medium
 
I was considering doing this repair myself....
Does anyone ever did this? Is there anywhere a maintenance manual for this shock? Where could I get a replacement bump stop?
 
I was considering doing this repair myself....
Does anyone ever did this? Is there anywhere a maintenance manual for this shock? Where could I get a replacement bump stop?


Without changing the spring and re-valving the shock there is no point. It would be about the same money to buy a good shock.
 
That's right....
I know the best would be getting a better shock, but I can't afford it now...
I think I destroyed the bump stop in a first travel I did some time ago... By the time I was using the original pre-load and compression damping and I recall bottoming frequently...
I think that maybe increasing the pre-load and compression damping a little more I could get away with it for some time more with this shock...
I found this maintenance manual on the net (attached - not the same shock, but sachs and similar)....it looks like I could remove the bottom linkage fork of the shock (page 24) and replace the bump stop without having to mess with the hydraulics (that seem to be working good...the bike has only 20.000 km).
Next problem is where to get the bump stop...any clues?....

Thanks again guys,
Matias
 

Attachments

  • Sachsshockmanual-HR.pdf
    5.9 MB · Views: 10
Just another thougth..... Are these bump stops supposed to resist heat? The exhaust is very close and the rubber on my picture looks 'cooked'....
 
Sounds like you frequently travel heavy. Instead of putting a bandaid on it when it failed once I would save up or find the money and do it right for safety.
 
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