Tire wear - Suspension issue ? - MVAgusta.net
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post #1 of 17 (permalink) Old 09-24-2016, 05:28 PM Thread Starter
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Tire wear - Suspension issue ?

To all the suspension gurus and experts.
This is the tire wear I discovered this week on my Brutale S.
The tire pressure is 33psi and thats all I know.
I read that the tire could be too hot and I need more pressure.
Or is it cold tear and I need lesser pressure?
Plus there is the build up on the trailing edge of the profile.
This could have something to do with rebound I read.
Now laying under my Brutale I tried to turn the rebound screw at the damper.
Well I turned it a half round clockwise.
Alone I can not feel there any clicks as mentioned in the manual.
What are You guys suggesting?
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post #2 of 17 (permalink) Old 09-25-2016, 04:58 AM
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Suspension setup is a skilled job - don't turn things at random. The real question is, how does the bike handle and feel? If that is good, then you are just getting the most out of your sticky tyres and it looks heroic.

The shocks on my F3 don't click.

The suspension tuning is for the benefit of the handling, and whilst a torn up tyre might be symptomatic of something- that isn't the import part, the handling is.

Take a chance while you still got the choice.
F3-800 / RVF400. Lancashire, England.
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post #3 of 17 (permalink) Old 09-25-2016, 04:59 AM
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Here's a useful article on suspension setup. http://bert.hollingside.com/temp/f3/...nsionSetup.pdf

Take a chance while you still got the choice.
F3-800 / RVF400. Lancashire, England.
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post #4 of 17 (permalink) Old 09-25-2016, 05:20 AM
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Quote:
Originally Posted by manicguitarist View Post
The suspension tuning is for the benefit of the handling, and whilst a torn up tyre might be symptomatic of something- that isn't the import part, the handling is.
You should not give suspension advice mate, not kidding, there's that much contradiction in that comment, it's scary.

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post #5 of 17 (permalink) Old 09-25-2016, 05:41 AM
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Originally Posted by Donsy View Post
You should not give suspension advice mate, not kidding, there's that much contradiction in that comment, it's scary.
+1

Cheers
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2011 F4
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post #6 of 17 (permalink) Old 09-25-2016, 06:20 AM
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So what is the proper advice then?

What a beast of a motorcycle!
It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


Skye I miss you. L'essentiel est invisible pour les yeux.
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post #7 of 17 (permalink) Old 09-25-2016, 11:32 AM
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Tell us the model of the bike, it could be a 750s or 910s ? I need to know more about that adjustment on the rebound, ambient temps, how old is that tyre ?
I'm no expert, so didn't want to comment, and Ralph has my direct contact details, I only commented because of obvious reasons.

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post #8 of 17 (permalink) Old 09-25-2016, 03:44 PM Thread Starter
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To Donny and everyone else interested.
It is a MV Agusta F4 Brutale S (750cc) build in 2005 as shown in my Registry.
The tire as such is a Continental Road Attack 2 EVO, is 1,5 Years old and has might done 1500 miles since then.
The picture of the tire is taken after a ride over the Blue Ridge Parkway and this is no race track.
Most of the Parkway is 45mph speed limit.
Theoretically You accelerate there to around 50mph and could kick in cruise control.
Every turn is doable with this speed and You do not risk another ticket.
So no hard breaking and accelerating.
Unless some cage is in the way.
So is this now the leading or the trailing edge, I'm pretty confused.
Secondly the rebound was just 3/4 of a turn from close I found out.
So I opened it now to roughly 2 1/4 over the course of the day.
The picture of the build up on this edge doesn't change.
Ah, and the tire pressure is the one suggested in the Manual 33psi.
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post #9 of 17 (permalink) Old 09-25-2016, 09:39 PM
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Hi Ralph, hope you're doing well man, sounds good when you're out riding and having fun.
Was it a very warm day.
If you can get someone to help you, I'd suggest you take carefull note of the suspension settings, then open the rebound setting all the way, bounce the rear of the bike by pushing hard on it, see how quick the seat returns.
Do this a couple of times so you get an good idea, then close that valve all the way and check if there's a difference on how quick the seat returns.
From what you're saying it sounds like the rebound was closed too much, if you know what I mean, this can cause the tyre to skim over the road surface, not returning no full contact fast enough and causing tyre wear.

Go through the motions, and test the compression also, if you don't have a more recent suspension guide, then the one posted above will do you fine.

FWIW, I only asked about the 750/910 thing because the 910 also came out in 2005 and I just wanted to double check since the registry doesn't say as much.

Continental doesn't say much about their tyre pressures, so I'd stick with the bike recommendations for now Ralph. There's such a big variation in tyre pressure recommendations for the bikes between different tyre manufacturers though. If your suspension is right, then you can start playing with higher pressures.

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post #10 of 17 (permalink) Old 09-26-2016, 12:22 PM Thread Starter
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Thanks Donsy.
I got into the garage and did the the rear suspension as per owners manual and workshop manual.
It is all a little spread over the pages but it has plenty of informations.
So measured first the X1 and X2 with the MV Adjustment tool.
To measure the fully extended suspension I turned the foot pegs over and rested the bike on adjustable jack stands.
So I measured 210mm and 185mm static sag, nominal is static 200mm.
Then I corrected this with adjustment spindle to 224 and 201mm, rider sag being around 190mm.
Next I corrected compression, i forgot the numbers but is was nowhere 18 (High Speed) or 12 (Low Speed)
I adjusted this to the mentioned manual specs.
Now I adjusted rebound to might 8 clicks as per manual.
It is really hard to feel anything there laying under the bike.
It could be also 9 clicks now.
Ahh and I measured the fork height and it is X=164mm (Nominal 165 - 165,5mm)
The Fork got adjusted by me according to the manual after the last service at Riders Hill.
Back in the Days the Bike handled awkward, pre tension, compression and rebound where all over the place.
Even different on each fork leg.
So I'm going for ride now.
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