SC1 Tire wear

[OneEighty]

After the tuning session on sunday I have a bit of a strange wear pattern on the front tire, right hand side.

The wear seems to continue all the way around and the tear can be up to a millimetre deep. I run warmers and 28psi cold.

Has anyone had this particular type of wear before?

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[chief wiggum]

looks to be rubber you've picked up, not tearing



but i'm no expert

[speed3]

You get the same wear I do, cos we're lapping at a slower pace we can get on the gas harder than the quick guys it heats the surface up more but not the whole carcass so the surface melts and cools and you get balls of rubber all over it. Well that's my understanding of it anyway.



Happens more on the right cos there's more right hand turns.

[smeghead]

.. def not right.

When I use SC1's on the front I run 28-30PSI hot depending on track factors, & it works for me (63-64sec/lap). Your pace & technique will determine temp off the track. Suspension settings will also contribute a lot to wear patterns.

Check the pressure hot, just off track (not 10 mins after, straight away), see how it compares.

PM Marty Moose & get him to setup your suspension to suit you, he'll also advise on track pressures, etc. He used to race the same bike so knows them well.

Small amount of shekels for a great result, better bike to ride & cheaper to run as it's not chewing tyres.

[speed3]

.. def not right.

When I use SC1's on the front I run 28-30PSI hot depending on track factors, & it works for me (63-64sec/lap). Your pace & technique will determine temp off the track. Suspension settings will also contribute a lot to wear patterns.

Check the pressure hot, just off track (not 10 mins after, straight away), see how it compares.

PM Marty Moose & get him to setup your suspension to suit you, he'll also advise on track pressures, etc. He used to race the same bike so knows them well.

Small amount of shekels for a great result, better bike to ride & cheaper to run as it's not chewing tyres.

I'd agree with smeggy. Check your set up and maybe lower pressures too. You're using a lot more rear than my bike does, 08 R6 @ 70-72 sec laps (not timed though just guesstimating)

I'll see if I an find a pic of mine.

[hammerhead]

Balls of rubber tends to be rubber off the track not the tyre of the bike this can happen due to being off the racing line

I'm not sure it happens on acceleration tho cox that transfers weight to the rear of the bike

Check your pressures immediately after a session I have seen increases from between 2 psi- 8-10psi from cold could find it's a pressure problem

Since your running warmers the carcass should be heated already I know that I can feel the difference from cold tyre to warm by the first corner(maybe check they are warming correctly around 80c for dry and 40c for wets I think us the usual go...

What times are you running??

[hammerhead]

I also run mine at around 30 hot

I'm doin 63-64 all day too now

[Stephan]

28psi cold is not enough for an SC1. Try around 31-32psi cold. Have you adjusted your suspension at all? Or are you just going of what somebody tells you is the right thing? The tear I assume you are talking about on the pic, looks like a cold tear, not rubber picked up from the track. Are you pushing the front, when you're cornering? I haven't seen this as bad on a front tyre, but regularly on the rear. How does your rear look? Normally, tyre pressures go up by about 4psi from cold to hot. I have never seen 10psi on a race tyre...

[BlackFZR]

What is the manufacture date on the tyres?

Are these the Diablo Supercorsa tyres, or the previous model Pirelli Supercorsa's?

[Kowalski]

If I had to guess, I would say too high a pressure. It's not allowing the tyre to flex enough and create contact patch and heat so a small area of undertemp surface rubber is doing all the work, and so tears up.

You need to check your pressure off the warmers and off the track. A lazer temperature guage might be useful too to check the temp of the tyre off the track.

[out_in_front]

From what I know about the conditions:

Suspension was setup by MM - however it has been refined a bit more since for track use
Lap times are 64 sec (ish)
Diablo Supercorsa's

[Scott52]

I've watched some of Dave Moss's videos. He seems to have good knowledge on suspension and tyre wear. Check out the website.


Feel The Track! Tire unusual markings and wear patterns

[speed3]

I've watched some of Dave Moss's videos. He seems to have good knowledge on suspension and tyre wear. Check out the website.


Feel The Track! Tire unusual markings and wear patterns

Cool link, cheers.

[Ausinanas]

I've got an old Fast Bikes mag with a tyre wear section,

Is it an old tyre?

the closest pic to that says " the tyre has been through too many heat cycles and is goosed
the outside of the tyre has become brittle , which is why its ripped up , rather than grained."

[Gangus]

Seems pretty strange that the tear is into the really sticky compound, where you can see the colour change. You didn't have any probs with your last set, and this set saw you go better straight up. Has the element on the rhs of your warmer packed it in?

[out_in_front]

I've got an old Fast Bikes mag with a tyre wear section,

Is it an old tyre?

the closest pic to that says " the tyre has been through too many heat cycles and is goosed
the outside of the tyre has become brittle , which is why its ripped up , rather than grained."

I am thinking this sounds like the most likely reason - how many trackdays has the front been through now slayed?

[OneEighty]

The suspension was setup by the moose about 6 months ago, some small fine tuning was applied to the front but overall I am (or now was) happy with the current settings. There was some noteworthy movement coming from the tyres throughout the day which doesn’t generally occur, lots of back end movement exiting the basin and the front was consistently trying to tuck ¾ of the way into turn one.

The location of the wear is also a bit worrying too as I imagine that the damaged rubber surface occurs in the position where I trail brake into the right hander’s. The wear pattern only developed in the 4th session too, prior to this there was no unusual wear. I monitored the wear on the following sessions and the pattern did not go away, nor did it get worse. confusing.

Stephan, Smeghead and Hammerhead – you all seem to run different pressures when cold, and my 28psi front and rear isn’t too far off the median of these. I get 6psi rise in the rear (34psi) and 4psi(32psi) in the front (measured immediately after session). Will try some lower and higher pressures on the 20th but from past experiences I don’t enjoy the lower pressures as they don’t suit my riding/bike setup.

BlackFZR – The Diablo SC tires are stamped 3210 so mid to late last year. They appeared to be in good condition when installed and gave me a new pb on their third session out.

Gangus – The warmers seem to be functioning correctly, I would probably have noticed if not.

Out in front - The front was only half way into its second day and it was garaged out of the elements so I can’t attribute any degradation to this.

Basically at ~$240 I don’t want to go and buy a new front to have the same thing happen again, nor do I want to bin it with a front end slide due to incorrect pressures/susp. settings. Might have to try and tune this one out myself, now if I only had the skills to do it........

[BlackFZR]

No problems with tyre age or heat cycles then. Pirelli recommend 30-32psi hot for the fronts and 25-28psi hot for the rears. Pressure rise is irrelevant as long as you run these pressures when hot. Personally I run 31psi hot in the front and 26psi hot in the rear.

That wear is obviously related to your set-up somehow. The rubber off the leading edge of the grove indicates a rebound problem that may only be appearing now that your going faster. The only thing I can suggest is make small adjustments, and see how tyre wear improves. Be aware that it may take two or three sessions until you see any change in the tyres, so just be patient, rather than changing something every session.

In terms of the front end tucking into the corner, this is affected by your body postion and also aggressive trial braking, so something you should possibly address quickly so as to ensure it doesn't suddenly mean $$$$.

I've never seen that style of tyre tearing before on the front so can only offer general advice.... Let us know how you go.

[Neil-51]

I think Tim is spot on with his comments. I'm not sure about the trail braking issue, although you seem to be wearing the front to the edge which means you are pushing it hard.

[Black Ninja]

I'm no expert but if the front is trying to tuck then you have too much weight up front.If you try to corner any faster you might crash. So I would add some preload on the forks then check your rebound , enough to bounce once then settle. The front tyre should start to clean up from this point.