Strange tyre wear ...

[Mr OCD]

This is after I tweaked the rebound:



Just checked careful the right side of the tyre and it does show similar pattern but not quite as noticeable.

[bass gt3]

Thing is from the pictures the wavy effect on the edge looks like it's been cut rather than worn if that makes sense. And looking at the tyre in general, there's no indication of a problem across the rest of the tyre.
Hi speed rebound isn't something you can adjust either.
Are you sure when you lean the bike to the right the chain isn't falling against the tyre??

[Mr OCD]

bass gt3 said:

Thing is from the pictures the wavy effect on the edge looks like it's been cut rather than worn if that makes sense. And looking at the tyre in general, there's no indication of a problem across the rest of the tyre.
Hi speed rebound isn't something you can adjust either.
Are you sure when you lean the bike to the right the chain isn't falling against the tyre??

Positive mate. It's not when possible due to the distance ... My tyre guy reckons it's fine. Just lean more pmsl

I had to increase rebound front and rear on the bike yesterday as it was rebounding to fast under track conditions!

[bass gt3]

Mr OCD said:

Positive mate. It's not when possible due to the distance ... My tyre guy reckons it's fine. Just lean more pmsl

I had to increase rebound front and rear on the bike yesterday as it was rebounding to fast under track conditions!

Ok so keep an eye on it and see how it goes.
As for needing more rebound, depending on what oil is in the shocks it's likely that it's thinned out if the weather is warm making the rebound respond faster. It's why I like 5w as it's more consistent through the temp ranges

[Mr OCD]

bass gt3 said:

Ok so keep an eye on it and see how it goes.
As for needing more rebound, depending on what oil is in the shocks it's likely that it's thinned out if the weather is warm making the rebound respond faster. It's why I like 5w as it's more consistent through the temp ranges

I'm going to get the shock rebuilt ... I do reckon track work was overheating the oil ... Hence the quicker rebound. However, I did set the suspension up in winter/spring ...

[clen666]

bass gt3 said:

Thing is from the pictures the wavy effect on the edge looks like it's been cut rather than worn if that makes sense.

I don't think it has been "cut", it just looks like that part of the tyre hasn't been used as you can still see some lettering on the first picture

[SAS Tom]

Mr OCD said:

bass gt3 said:

Ok so keep an eye on it and see how it goes.
As for needing more rebound, depending on what oil is in the shocks it's likely that it's thinned out if the weather is warm making the rebound respond faster. It's why I like 5w as it's more consistent through the temp ranges

I'm going to get the shock rebuilt ... I do reckon track work was overheating the oil ... Hence the quicker rebound. However, I did set the suspension up in winter/spring ...

You weren't overheating the oil. Without trying to sound like a dick don't attribute this issue to that because it isn't the cause.

[Mr OCD]

I think it's a damping problem ... The 'high' spots are the same on each side of the tyre ... Just less pronounced on the right side ... So reckon rebound issue.

- either lack of...
- oil breakdown...

[Prof Prolapse]

So the spindle is correctly torqued on both sides and the bearings and tyre pressures
are all good?

Seems mental.

[graham22]

How old/worn/slack is your chain?

That's whats coming into contact with the tyre - you normally see traces of chain lube but I guess on a track day you're leaning far enough to wear the lub off the tyre (or the chain is very dry).

[bogie]

mmm...chains. Haven't touched one of those in years and new bike has a chain...mmmm. Best take a look later

[dean100yz]

bass gt3 said:

Mr OCD said:

Perfectly sure fella. Alignment is all spot on...

Got the tyre / suspension guy to have a look at it on the track day and his comment was 'fast rebound'...

Couple of issues with that..

1. it's only on the left. Suspension issues would show on both sides.
2. The spacing of the 'cuts' would indicate a really high frequency. Which would mean the rebound would be skipping uncontrollably all the time and the entire tyre would show signs of rebound issues, like raised sipe edges. Yet the sipes show nothing of the sort..

I would have thought if I see that on mine after a track sesh rebound too. If only on one side then maybe you're spanking it more on that side

At Brands I destroyed the right and had tears from a bad setup but left was fine

[FartKong]

[Harby74]

Tyre pressures....

What tyre pressures are you running? You may want to try adding a few psi and see what happens.

That pattern is similar to what happens on big bikes fitted with soft structured front tyres, which normally shows as cupping of the front tread pattern and it is worse with lower tyre pressures, the tyre shape is essentially deforming under load and I bet is what is creating the uneven edge wear pattern you have.

[Prof Prolapse]

FartKong said:

These Sikhs and their lack of helmets piss me off.

They'll be wanting to vote next.

[Mr OCD]

Harby74 said:

Tyre pressures....

What tyre pressures are you running? You may want to try adding a few psi and see what happens.

That pattern is similar to what happens on big bikes fitted with soft structured front tyres, which normally shows as cupping of the front tread pattern and it is worse with lower tyre pressures, the tyre shape is essentially deforming under load and I bet is what is creating the uneven edge wear pattern you have.

30psi front and rear COLD... Metzler M7RR

[Dog Star]

OP - keep an eye on that; I had that exact pattern but running down the sidewall on my MVs rear Supercorsa. It then started to develop tiny splits on the pointy "crests" of the wave shapes. Replaced at 580 miles.