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Discussion Starter #1
I lowered my SWB 130 by 50 ish and put my 20"s on with those tyres well over a year ago. Rides straight no problems.

Went for an MOT at my mates and they said you need to get y tracking checked, having a look while up on the ramp, my fronts have wear on the very corner of the inside of both front tyres.

I've been and had them laser aligned and the guy said there's nothing he can change and it's running pretty much spot on.

I have been running them at 43psi from the get go. Wear across the rest of the tyre is even.

as I've lowered it a bit there is that small amount of camber and the inner tyre wall does bulge a little bit more at the contact point compared to the outer wall.

It's basically taken the tread depth off for about an inch on the very corner of the tyre. It's wierd and making me think I'll end up with a blow out before I get to the tread wear markers.

Final note, they are Kenda Keisers and supposed to be load rated.

Has anyone got any clue what's causing this, I've also considered it's just a wear issue from full lock turning or something???
 

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It does sound camber related. Did they tell you what the values were? I know my camber changed 0.5 degrees when I dropped 40mm but it was still within tolerance which is good becasue I dont think it was adjustable on my van.

255/35R20 XL tyres are 97 rated (thats an industry standard, they dont vary between manufacturers). That is a little on the lightweight side for a T5 but wouldn't normally be a problem for a van used for leisure rather than load lugging. It depends what version of the van you've got. They'd probably be enough for a T28, whereas a T30 would wear 100 rated tyres and a T32 needs 103 rated to be legally compliant.
 

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Discussion Starter #3 (Edited)
Hmmm says 750KG on the tyres?

Got loads of figures here

Rear camber -1.45deg and -2.06 deg
Front camber -1.1 and -1.25

I Thought they were XL so ok for my recreational use but if this wear is just because they are not propperly rated then I'll replace them with better ones come the time.
 

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750kg = 98 rating, 97 rating should be 730kg but I guess there can be exceptions to the rule. When a tyre has XL written on the side it means the load rating is about 3 points higher up the scale than the std tyre. It doesn't automatically mean its van rated.

I doubt the wear is due to load rating and the tyre pressure is okay IMHO. Can you switch the tyres left to right to even out the wear or are they handed/directional?
 

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Discussion Starter #5
y right.checked again. 730 so 97. probs how the weel price was kept down. directionals but wear is same both sides. will be more clued up when i renew which is gonna be sooner than if i had right ones cirst time.
 

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I think the wears just from a bit of toe out when accelerating with slightly overinflated tyres, its difficult to reverse the wear now its started. Drop the pressures abit, Bobley will tell you by how muchT:
 

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Discussion Starter #7
Happy to drop the pressure, once it gets to 38's they start to look like they need a bit back in themT:
 

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Has your guy set it to the manufacturer's specs or has he made adjustments for the tyre wear??

Quite often technicians will not deviate from the manufacturers specs even tho the tyre wear indicates otherwise. Generally speaking man' specs are fine but sometimes you get the odd vehicle that doesn't play ball and the problem is usually exasperated by lowering and fitting bigger wheels. As your tyres are wearing on the inside get him to toe the wheels in a few degrees outside of the manufacturers specs and monitor your tyre wear. Obviously don't go too far and make sure the steering is not compromised. Does this make sense?

Could be camber, but I've seen/owned cars with alot of negative camber and never had problems with tyre wear like you describe.

Jay
 

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Discussion Starter #9
He actually didn't have the proppa specs for my van but worked off experience and thought best to leave as is.

I was told by my friends he does all the local police vehicles and so knows his stuff and recommended him.

Still confused.....
 

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I'm very confused aswell! If he didn't have the specs then how can he claim to have "laser aligned" your wheels:*

Like I said, once it's been checked and aligned to the manufacturers specs, if it's still scrubbing tyres then it will need further adjustment, even if it means going outside the manufacturers specs. A few degrees over or under adjustment is all it takes usually and won't negatively affect the steering/ride.
 

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Discussion Starter #11
I'm very confused aswell! If he didn't have the specs then how can he claim to have "laser aligned" your wheels:*

Like I said, once it's been checked and aligned to the manufacturers specs, if it's still scrubbing tyres then it will need further adjustment, even if it means going outside the manufacturers specs. A few degrees over or under adjustment is all it takes usually and won't negatively affect the steering/ride.
Sounds like he just wasn't interested, he ran through the figures and said they all appear completely normal in his experience.

sounds like £55quid wasted then. I was hoping he'd have some answers for me :*
 

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Chaps, if I could throw in a few thoughts. I specialise in steering and vehicle geometry and there are a few things that could cause inner wear. Dropping, or raising the ride height for that matter will most likely have an affect on the camber angle. The further you go either way the further you will alter it as it pivots on the inner mounts. It used to be an adjustable value on the older models but not any more. The 'absolutely' correct value for your camber angles is not totally essential as there tends to be quite a tolerance for the checking value and also a tolerance for side to side difference. Fitting wider than standard tyres to your dub will increase the weight that the inner edge takes, therefore increasing tyre wear. Alteringing the tracking to try and aleviate inner wear wont work because any adjustments to the toe will have a miniscule effect on the camber but adjustment to the camber will have a dramatic affect on the toe. Therefore all you will do is create rolling resistance and make your dub less fuel efficient. When you had it checked they should have checked the camber angles and reported to you what they were. But most importantly, they should have been honest with you and told you how it is. FYI, a few degrees of adjustment in alignment terms is a VERY long way. Typically front axle toe will be parallele to 2mm toe in. Two degress equates to 35 mm. Work it out.
Baz
 

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Just as a thought .... When you lower the van...the camber goes out slightly, and over a year then it could scrub the edges I assume, but I was advised that once I lower my van that every 6-9 months I should have the tyres swapped over on the rims...so the inside edge will be the outside edge....this was specifically to counter this problem.....so once lowered ibelieve getting a tyre fitter to swap your tyre over every 6000 miles is required to get more even wear out of the tyres....
 

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Showbiz_28 pretty much summed up what my local tyre place told me. Basically you pay a price for having 'non-standard' (read: big) rims on a van. You may make matters worse if you also lower it (as I did ;-).
The chap also told me the same thing about wider wheels and inner edges, and it makes total sense when you think about it. And our vans are quite front heavy anyway so your tyres won't last as long.
Mine also wore first on the inner edges, but by time they were on the limit there was not that much tread left on the rest of the tyre either. So I guess the lesson I learnt is: if I want the van look pimp I'll have to put up with new tyres a bit more often than otherwise. I can live with that.

By the way, my tracking was also checked and deemed spot on by two different garages. I'm running 245/40/19s on 40mm lowered H&R springs on my T5 Shuttle.

Cheers

Stefan
 

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750kg = 98 rating, 97 rating should be 730kg but I guess there can be exceptions to the rule. When a tyre has XL written on the side it means the load rating is about 3 points higher up the scale than the std tyre. It doesn't automatically mean its van rated.

I doubt the wear is due to load rating and the tyre pressure is okay IMHO. Can you switch the tyres left to right to even out the wear or are they handed/directional?
Now I am confused My understanding was that to be leagal the tyres fitted have to be able to take the plate rating in the case of a T28 1450 kg front 725 per tyre
1550 Kg rear 775 per tyre

I also thought that the XL rating did not increase the max load that the tyre should be used at.

I to am running 255/35ZR20 97W XL and have found the best running pressure to be 40psi


:confused::confused::confused:
Andy
 

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Agree...40 is pretty good...I wouldn't trust XL...IMHO it means nothing and does not change the wear

Directional tyres don't matter, you. Can still change them on the rims...you just can't change the wheels over, needs the tyre to be removed from the rim and then fitted in the correct direction to the other side....inside will then be the outside of the tyre...hence wear will be on the outside, and scrubbing can begin on the inside.H:
 

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This is the exact reason I buy budget tyres, no point ruining expensive rubber in 7-9k miles. Im on cmc coilovers (75mm springs before) wound right down with 255/35/20, and it scrubs the insides of tyres. I swapped the fronts onto the back to prolong the life but they had worn funny and it sounded like I had a wheel bearing gone at anything over 30mph:eek: Its a side effect of being low, on big wheels:) To coin a phrase, 'if you wanna dance all night, you gotta pay the band':*
 

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. I swapped the fronts onto the back to prolong the life but they had worn funny d':*
MR T5 if you had a tyre monkey swap the lefts for the rights you would get very near the full mileage out of them...my mate has his changed over every 6k...and gets 18k out of his michies....his mate is a tyre man...and does it free....lucky burger..LOL:
 

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MR T5 if you had a tyre monkey swap the lefts for the rights you would get very near the full mileage out of them...my mate has his changed over every 6k...and gets 18k out of his michies....his mate is a tyre man...and does it free....lucky burger..LOL:
I was a little late for thatI: Will keep my eye this set and may as you say swap sides:D
 

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i see:D defo worth keeping an eye one mate, 6k is where my mate reckons the wear is medium, and funnily i was in a tyre place doing some work the other day and the bloke in there said similar.5-6k then change the lefts to right...and if need be change them again at 12 ish...think this is what i will do when i evetually get my beast lowered...looks like a silver mountain climber at the momentH: looking at getting either the cmc or prosport height and dampening adjustable coilovers...reckon no point in messing, slam it and put up with the tyre wear...:D
 
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