What causes this?

[The Stranger]

Had 2 (brand new) tyres fitted and I static balanced the wheels and fitted them back on.
The bike now has a shake it never had.

So

We have checked the usual suspects (head bearings, brake and wheel runout) all within spec, so pulled the front and rear wheels and had the balance checked dynamically. The rear was pretty close, but the front was asking for 100 grams on the dynamic balancer, so the guy static balanced the front with a couple of 5s.

Still shakes

Ok, pull the front tyre and find this. The first 2 photos are of "unusual" patches (of which there are 4) on the inside of the tyre, the second 2 are of a second hand tyre of the same brand and type for the purposes of comparison. So that has improved the shake, but not eliminated it. Will pull the rear tomorrow if it exhibits the same issues.

So what's happened?
I intend to go back to the supplier to get their take but also keen to see what others say.

Ignore the Hawaiian safety boots, I'm saving for my ACC levy so can't afford decent footwear.

[Sensei]

Replace both with a new set of the same tyres , looks like a defect in the case's

[CookMySock]

Buy quality tyres and that doesn't happen - I bet thats not a michelin. I had a brand new shinko go weird on me, but that was a shinko, and thats what ya get with cheap shit tyres.

Steve

[Little Miss Trouble]

Buy quality tyres and that doesn't happen - I bet thats not a michelin. I had a brand new shinko go weird on me, but that was a shinko, and thats what ya get with cheap shit tyres.

Steve

Does Stranger seem the type to skimp on good rubber?
No. Moron.

[Little Miss Trouble]

Ouch, red coming from you reeeeeally hurts

[The Stranger]

Ouch, red coming from you reeeeeally hurts

She only told it like it is DB, no need to get snarky.

[howdamnhard]

Looks like the case has been pinched/stressed possibly in manufacture. Take them back and try another one.

[Mishy]

Hey there,
The little patch is not uncommon - I have no idea exactly what they do, but i'll do some digging.
There look like little scuff marks on the tubeless membrane, which do seem odd.
Normally that would only happen when the tyre is run flat, but I could be misreading the pictures.

[The Stranger]

Hey there,
The little patch is not uncommon - I have no idea exactly what they do, but i'll do some digging.
There look like little scuff marks on the tubeless membrane, which do seem odd.
Normally that would only happen when the tyre is run flat, but I could be misreading the pictures.

Almost looks like the tyre has been pinched in places within or about those patches (from the inside only) the tyre fitter who replaced them asked if I'd been running curbs. I haven't, well not on that bike, I frequently do on the XT. The tyres were fitted and the bike ridden down the southern to Puke, I noticed a bit of shake on the motorway, but really wasn't going fast at all. At the track however it became somewhat limiting as at 220 it was hard to keep my eyes in focus.
Initially set the front to 34 for the trip down the motorway and dropped it to 30 for the track. Tyre hasn't been run flat and has held excellent pressure. They've been on there for a while as I have been too busy in the last few months to sort this out.

[ManDownUnder]

If it's a manufacturing fault then you need to keeop using it, crash and pay more in ACC. It's not their fault for getting it wrong - and not your fault for having an accident.

Just pay up... there's a good chap

[R6_kid]

Buy quality tyres and that doesn't happen - I bet thats not a michelin. I had a brand new shinko go weird on me, but that was a shinko, and thats what ya get with cheap shit tyres.

Steve

They are quality tyres, he just chose not to mention the name so as to not bring the manufacturer, or suppliers into disrepute without due reason as that is not his intention.

p.s. my red hurts more than yours, I just choose not to use it.

[Mishy]

They are quality tyres, he just chose not to mention the name so as to not bring the manufacturer, or suppliers into disrepute without due reason as that is not his intention.

p.s. my red hurts more than yours, I just choose not to use it.

Fair call, that way we deal with facts alone !

[CookMySock]

heh, I have nine vehicles registered on the road, and I have been buying tyres for thirty years, and any brand that I have had a fault on a NEW tyre like that, I will ditch them and never use them again. You should, of course, do as you choose.

Your projection and fixation that I am abusive is product of your own thinking. I made a concise but disparaging remark about the TYRE (which in my opinion was warranted - cap fits wear) and was greeted with abusive name calling from a third party, to which I repped (dissapproving) a concise non abusive reply, with which I am greeting with more abusive replies. Do the math. :niceone:

The real reason you are only able to see things as abusive, is because that is how you are. Lucky for me it isn't my heart attack. Keep it up and you will die a stressful death by your own hand. Think about it.. :blink:

Steve

[White trash]

Ouch, red coming from you reeeeeally hurts
Show him your nuts........

[Shaun]

Fair call, that way we deal with facts alone !



Have you seen this before on other Continental tyres Hamish?

[Mishy]

Have you seen this before on other Continental tyres Hamish?

Hey Shaun,
I'm not sure what brand this tyre is, but the little "patches" are not uncommon.
As far as the head shake goes, it's suspicious that it appeared at the same time as a tyre fitment, but could (as I'm sure you have picked) be one of many things.
I have come across several dealerships who have poor wheel balancing gear, which is one possibility. Another I have struck recently is a wheel bearing fitment fault.
More info would be the trick, although I think you would have to have the bike to get to the bottom of it.

[Shaun]

Hey Shaun,
I'm not sure what brand this tyre is, but the little "patches" are not uncommon.
As far as the head shake goes, it's suspicious that it appeared at the same time as a tyre fitment, but could (as I'm sure you have picked) be one of many things.
I have come across several dealerships who have poor wheel balancing gear, which is one possibility. Another I have struck recently is a wheel bearing fitment fault.
More info would be the trick, although I think you would have to have the bike to get to the bottom of it.


http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=150421&d=1257747890

Hey Mishy, it is a Continental

[YellowDog]

Those marks appear (to me) to be heat related.

If te wheels have been balanced with the new tyres, then you shouldn't get such patches.

I'd take them around to the tyre shop and see if they can explain it.

Good luck.

[The Stranger]

http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=150421&d=1257747890

Hey Mishy, it is a Continental

You are of course correct, however, I assure you that the identification was purely accidental and must confess to being a numb nuts for not checking the photos carefully enough in this instance. At least I got the important stuff right, there are no chicken strips showing eh.

My post was a genuine request for information and not an attempt to name and shame. I humbly apologise to Conti

[The Pastor]

You are of course correct, however, I assure you that the identification was purely accidental and must confess to being a numb nuts for not checking the photos carefully enough in this instance. At least I got the important stuff right, there are no chicken strips showing eh.

My post was a genuine request for information and not an attempt to name and shame. I humbly apologise to Conti
so did u get it sorted?

[The Stranger]

so did u get it sorted?

Not yet, Been fooken busy of late, but will get to it shortly.

[Shaun]

You are of course correct, however, I assure you that the identification was purely accidental and must confess to being a numb nuts for not checking the photos carefully enough in this instance. At least I got the important stuff right, there are no chicken strips showing eh.

My post was a genuine request for information and not an attempt to name and shame. I humbly apologise to Conti



Big of you to type this Stranger.

I was not trying to aid the nameing and shameing game, just pointing out the fact that your problem is with the said brand, and hope fully Hamish will be able to come up with a valid tech awnser to what has gone wrong with there brand, as I know they are serious, and do not want any trouble product out there

[Maha]

Its inside out.....:blink:

[Kickaha]

heh, I have nine vehicles registered on the road, and I have been buying tyres for thirty years, and any brand that I have had a fault on a NEW tyre like that, I will ditch them and never use them again. You should, of course, do as you choose.

There isn't a brand in the world that hasn't had a fault at some time or another

One thing with static balancing is even when you get it to zero you will generally be left with some dynamic imbalance but If it starts to shake at lower speed and gets worse and worse as you increase speed I would be looking at uniformity rather than balance

[R-Soul]

Could it be innacutaye fitment of the wheel? Something changed when the tyre was changed. So its:

- wheels fooked or
- fitment fooked, or
- bearings fooked.

[mouldy]

Were they beaded out evenly , with the asian Contis and Michies getting an even bead can take some time . Never had much of a problem with the cities before , good option for the little ones .