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Real world rear suspension travel.

marcus_b

marcus_b

Tuned and Synch'ed
Joined
Oct 30, 2008
Messages
70
Hi all,

Has anyone measured the actual rear suspension travel on there Griso. The manual says its 110mm but I can only get 75mm actual travel out of the back wheel before the shock is hard up against the rubber bump stop. Could be my measuring is bad... :oops:

Just curious to see if fitting a smaller bump stop might help smooth out the rear end without sacrificing the protection of the shock.
 
Do you know for a fact that you are bottoming out the shock? If this is the case, removing the bumpstop is the last thing you'd want to do; instead a stiffer spring may be necessary. Where is the the preload adjuster in relation to the length of the thread it rotates on, and has a suspension setup been done on the bike?

If the suspension has not been set-up starting with proper sag measurements, then there is a good chance there is a LOT of improvement to be had from the stock components, plus it'll provide information as to whether the spring rates are adequate for your riding weight...

My 2009 Griso had about right forks spring rate and definitely too soft a spring on the shock absorber for my riding weight of 230lbs and my riding style. With good setup, however, it was definitely acceptable, adequate, and, for the most part, enjoyable.

In any case, removing or thinning out the bump stop -- I think -- is not a good idea. Perhaps someone else can chime in with a different opinion.
 
Hi,

Thanks for the detailed reply, I've no problem with my suspension set-up, posts on here were very helpful with this... so I don't want to start another suspension set-up thread.

Just curious to see if anyone else has actually checked the rear travel on the bike as there seems to be only ~75mm travel (vs the manuals 110mm)... useful to know if you like to set sag as a percentage of the travel (25-30%)

I'm measuring the full range of travel on the rear whilst it is in the garage, from the rear wheel off the ground, through to the spring wound fully down and the suspension fully compressed into the dump stop via a strap...taking care not to compress it too much though as I know the bump stop is there for a good reason!

The bump stop will reduce the stroke of the rear shock...Guzzi probably just quotes the theoretical travel (calculated using the full stroke length of the shock) instead of the actual stroke length due to the bump stop... This could be the norm... I've never actually bothered to check before!
 
Just out of interest, what are your compression and rebound settings on the rear? I'm tinkering with the suspension on a 2010 Griso that I bought recently. The biggest improvement was to drop the forks through the yoke down to the 'sport' setting - when I bought the bike the front was set with only 2 rings showing and I couldn't understand why the front end felt so bad. I had to tiptoe around roundabouts and through sharp corners, but with the forks dropped a bit the handling is transformed.

I still don't think I've got the compression and rebound set to best effect though. I ride on a lot of bumpy back roads and I'm trying to find the best compromise for comfort and keeping the wheels in contact with the road.
 
Hi, I'm an italian Griso Friend and sorry for not good english ! :oops:

The problem for the rear suspension of Griso is not the travel measure, but the spring very poor.The rear suspension can not absorb on rubber stop! This is also compressing the spring to the maximum...

This problem can be fix changing spring and hydraulic for the rear suspension or changing directly rear suspension witn a new model
type MUPO GT , MUPO AB1 ecc.. :evil:
 
guido1100 said:
Hi, I'm an italian Griso Friend and sorry for not good english !
Click to expand...

Thanks for your post.

Expensive suspension mods seems to be a a universal language...
http://www.motoracingshop.com/product_i ... anguage=en

This looks nice but I am looking for a spring only.

(1) Has anyone replaced the stock spring with something a little more robust?

(2) Does anyone know the spring rate of the stocker?
 
For amazing Italian suspension bits, see; https://www.guzzitech.com/store/produc ... ay-16.html

Dave, I have a loose Griso shock, so I'll do some calcs in the morning and post. Downside is that just the spring likely won't do it. The Griso is valved a little on the firm side, both front and rear. Depending on the spring (installed), it may or may not help much. Right now, I have a KE + HYD Matris shock in stock for a rider ~225 lbs with gear for the Griso, and I also have one 'S' fork spring kit in stock.

Makarushka has his 'R' listed on the Classifieds too I believe.
 
@guzziownr yes i do it !

I have change spring and hydraulic parts of the original rearsuspension with a progressive spring and hydraulic ohlins , for 350 Euro.

However , if you change spring of rear suspension you need to upgrade the hydraulic system , because work properly.. :)

(K rate for the stocker is very low because is set for 75kg)

This is my rear suspension the modify is made by http://www.oramsospensioni.it/
 

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