Tyre wear question?

[sharpo]

I noticed that the front tyre looks more scrubbed than the rear over near the edges, also i'm nearer to the edges on the front than the rear.

Pirelli 120/70 and180/55.

35psi and39psi.

Could it be the front damping or preload is too hard?

cheers

[Rob B]

Braking deep into corners?

[sharpo]

I'm not that quick, maybe I don't know i'm doing it?

[Glyn]

is the bike understeering.
sounds like it must be
as the back is pushing the front when cranked over
raise the rear or lower the front

[Fordie]

I would say thats nomal,if you fit a 190 on the rear then you would see the front closer to the edge as its a 180 and has a smaller profile the front does'nt get such a hammering in the corners. Thats my experiance between the two as Ive just gone back to a 180 from a 190. 4D

[sharpo]

It is a 180 so i'm not sure what you mean 4D

I have dropped the forks through the yokes, or raised the yokes up the forks if you prefer so yes the front is higher than it was when I got it, i'll change it back or lift the rear.

Is this the result of what people mean when they say "pushing the front"?

Thanks all.

[Fordie]

"Pushing the front" thats when you go into a corner a bit too hot/fast and still be on the front brake ,your'e then "pushing the front" tyre to its limit of adession and a possible spill.
The 180 is the width of the rear tyre (180mm) with a 180 on the rear your front tyre will turn quicker into a corner and lean over in comparison to the width of the rear tyre thus the "Chicken" strip ( where the tyre has not been used)will be wider, but closer to the edge on the rear
With a 190 mm rear tyre because its wider you find the front is slower to turn in and will wear nearer to the edge , as you are trying to overcome the extra width of the rear . Sounds complicated you need to see it more than talk about it. Hope that makes sense 4D

[ericthered40]

1225

1226

1227

1228

All is normal if they look like this, :D

[domski]

1225

1226

1227

1228

All is normal if they look like this, :D

They can't possibly be yours ETR ;)

...where are the grass stains?

:D

[ericthered40]

All my own work me old flower, chasing Ali on a 583 at Cadwell last year:D

Still couln't catch the **** :lol: anyone up for 2007 620 :eek: it's only slow and ezzzzzzzzzzz:devil:

[Ray]

Sharpo,

Those tyre pressures look too high, I thought a 748/916/996/998 ran 33 front 35 rear when cold? Check the handbook??

Ray.

[sharpo]

As recommended by PB

http://www.ducatisti.co.uk/about47.html

shall i put my earplugs in now (metaphorically speaking)

[Ray]

Just had a look in the 998 owners manual that comes with the bike.

Front 2.1 bar
Rear 2.2 bar

To Convert to PSI x 14.5

so Front is 30.45 PSI
Rear is 31.9

Manual also says put 0.2 to 0.3 bar more in to "avoid front wheel rim distortion when riding on bumpy roads":eek:

Maybe PB know best:rolleyes:

Don't know if the 916/996/748 manuals recommend something different.

Hey Ho,

Ray.

[sharpo]

I'll give it a go Ray.

The 998 and 916 are a similar weight and the geometry must be the same so it should be ok.

[rcgbob44]

I run 32F & 34R in my 998 and all seems ok, but then again I have lots of weight to keep the rear on the road!

[Fordie]

Thats what I run also. 4D

[khu996]

32f 34r on every bike I've had :D

[Mello-Yellow]

32f/36r on 916 and 996 on road.

[psychlist]

32f/36r on 916 and 996 on road.
Same here for my 998, in fact, I now run those pressures on the 'Strada as well :cool:

[loony888]

the pirellis run a rather round profile on the front and the rear falls away quite dramatically, this front causes slightly slower (by comparison to other brands) steering and makes it easier to scrub the front closer to the edge. getting to the edge on the rear requires a lot of lean and therefore more speed. with michelins, just for example, the opposite is the case, the front profile is very triangulated with a rather flat profile on the rear. this front tyre gives slightly faster steering and it's very easy to get to the edge on the rear, the front on the other hand is a different matter, i can only get near the edge of the front on a track. for what it's worth i run michelin pilot power with 35psi front and 38psi rear on the road. (30psi f&r track)
cheers all.