Originally Posted by Bladerideressex

come and have a look at the front tyre on my 999s then.... its only shouldered on one side if thats how you prefer to describe it....

I would tend to save that description for a tyre that has squared off... this hasnt..its just seen more wear to the right than the left and now has an unequal profile....

EDIT... ok, never seen one with seriously assymetric wear after road use... Lots of track use?

"Shouldered" is usually (at least in my experience) used for a front that has plenty of tread left in the middle, but is worn out on the sides towards the edge of the tread.

"Squared off" is what happens to the rear if you do a lot of motorway (tho I have seen fronts squared off too in Las Vegas where the nearest bend is 50 miles away) where the middle of the tread disappears.

Originally Posted by Bladerideressex

No its not been near a track.... pretty sure its the effect of camber on the road in my opinion... nothing else could have caused this type of wear... the tyres done circa 5k too so not complaining ... its a Michelin Pilot Power 2CT....

good going if you can wear the edges out on a tyre before the middle! love to find the roads to ride where you can do that!

have seen fronts squared off as well as rears.... maybe not quite as noticeable but there all the same...

I've heard this idea that it's the camber before... but I'm not convinced tbh... still, I've no evidence other than my own tyres which don't wear out this way, and I certainly do as many right handers as left.

I've got a piccy of one of my front tyres somewhere which shows the shouldered effect... I took it for some Americans who couldn't believe you could wear out the sides of the front before the cent[er] line. I still had about 3mm tread in the centre groove, about halfway out to the edge of the grooves the tread was down to the wear indicator.

That was when I was despatching from Kent, all across the S of England.

The current front is a Conti Motion, which is around 13k at the moment, and this has worn quite evenly all round - at least partly because the bike's been used mostly for instructing which means fairly gentle lean angles and speeds, and also quite a bit of motorway this year (unfortunately). The rear was doing well until 400+ miles of motorway in France squared it off a bit.

Originally Posted by The Spin Doctor

Where have I not been civil with you?

In your summation that my post can only be bait and not furthering the discussion of cornering techniques. Way to go.

It's nothing to do with "differences of opinion", it's simple physics.

To explain again...

If the bend is constant radius (as many are) then if you increase speed even fractionally in a bend by "powering out", the only way to hold the bike on a constant radius line and thus stay on the road, is to increase lean angle at the same time - which as I say is bad for the traction pie, being exactly analogous to braking harder as you're leaning further.

And which as I say, if done properly as if done properly you are not increasing speed just maintaining it from turn in to max lean and from max lean to corner exit you WANT the bike to sit up.

So the point that following advice to apply power in the bend was incorrect was, well, incorrect. Done the right way it IS the correct thing to do.

What this means is that you MUST be almost completely round the corner before you start to accelerate in any significant way, if you're not going to push yourself wide part way round the turn.

You are quite welcome to come and watch me throttle HARD from the apex and not run wide some time.

Of course, if the bend is decreasing radius, then even taking the corner at constant speed will make the bike run wide unless you lean it over more - which is why it's a good idea to enter a corner at a speed that gives you the opportunity to add lean angle and if necessary roll off and even brake mid-turn.

Agreed.

The only shape of bend that allows you to power out and increase speed significantly from the apex without needing lean is an increasing radius turn.

I am hard on the throttle from the max lean point on practically every corner. You telling me they are all decreasing radius turns?

Originally Posted by The Spin Doctor

I've heard this idea that it's the camber before... but I'm not convinced tbh... still, I've no evidence other than my own tyres which don't wear out this way, and I certainly do as many right handers as left.

I'm convinced.




It's sod all to do with camber.
The camber on a RH bend generally works against both available grip and the riders head which tends to lead to most people taking it slightly easier.
That certainly won't account for more wear on the RHS.

Originally Posted by Bladerideressex

Sorry if I didnt make it clear but am not trying to suggest its anything to do with camber in the corner that has caused the different wear .... I reckon its caused by the camber when riding in a straight line and the bike is in effect leant a few degrees against the camber to maintain upright position....

I still think you are wrong. Everyone's tyres would wear on the right then, and it only a few mm off centre.
They don't.

Originally Posted by Bladerideressex

Sorry if I didnt make it clear but am not trying to suggest its anything to do with camber in the corner that has caused the different wear .... I reckon its caused by the camber when riding in a straight line and the bike is in effect leant a few degrees against the camber to maintain upright position....

Do you sit off-centre on that bike?

Serious Q, as I've seen many riders sitting 'crooked' which must lead to the bike being very slightly off-vertical.

Worst was a bloke on a GT750 'kettle' I used to see on the way to work. I wondered why, until one day when he was ahead of me, the lights changed to red, and he rode over to the kerb and just managed to get his toe down to support the bike . . .