Nob is grinding into the tyre wall. DB 1412

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ollek
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Location: South West Finland

Post by ollek » Thu Nov 12, 2015 1:38 pm

The nominal width for a 7.50 tire fitted onto a specified rim and inflated to recommended pressure is 205 mm. This is according to the European tire standards and the ply rate does not change this nominal measurement in any way. The problem here is, that eastern tire manufacturers do not always follow the European standards, they have they own systems.

Guest

Post by Guest » Thu Nov 12, 2015 2:10 pm

All tyres are manufactured to a standard, they have to be to comply with Law regardless of where they are manufactured and if you wish to comment or discuss this further I suggest you start a new topic.

broadsword
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Post by broadsword » Thu Nov 12, 2015 3:53 pm

The ply rating is the strength (old style) of the tyre isn't it???. Didn`t think it made any difference to tyre width.

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db2d
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Post by db2d » Thu Nov 12, 2015 4:14 pm

Stub axles can and do bend.As a process of elimination, change the wheels from side to side. If the problem still persists it is the stub axle or bearings.

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vuk
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Post by vuk » Thu Nov 12, 2015 6:15 pm

The wheel can not wobble - no movement. The tyre reads 8 PR, but nothing about PLY.
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DB 1412 1977

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vuk
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Post by vuk » Thu Nov 12, 2015 6:17 pm

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DB 1412 1977

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dexta
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Post by dexta » Thu Nov 12, 2015 6:54 pm

is this the same rim the tractor had before it went in to the repair place? all I am wondering now is if the offset of the rim is incorrect by fitting a new rim. The rim that takes a 6.00x16 tyre can have a different offset to the rim for fitting 7.50x16 tyres. by this I mean the distance between the hub flange and inner wall of tyre may be more on this new wheel than the old wheel, which would throw the wheel closer into the tractor, the rim previous may have had a lesser offset meaning tyre was further out from centre and therefore didn't rub.
Cheers

Dex

Guest

Post by Guest » Thu Nov 12, 2015 6:55 pm

It's the wheel that's the problem, the outside has one 'step' from the centre to the outer bead, the inside has two steps, it should be the other way around for this width tyre to fit, 'reverse rim', the ply of the tyre is not helping, yes, 8PR is the ply rating and it certainly does make a difference to the width of the tyre when inflated. You need a tyre that is no more than 6 ply rating and says on it 'tractor 3 rib'and inflated to a maximum pressure of 35psi (2.5bar). What' on the other side?

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vuk
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Location: Denmark

Post by vuk » Thu Nov 12, 2015 7:54 pm

Is the wheel simply mounted inside out? Should I just turn it arround?
Last edited by vuk on Fri Nov 13, 2015 7:30 am, edited 1 time in total.
DB 1412 1977

Guest

Post by Guest » Thu Nov 12, 2015 8:30 pm

No, if you turn the wheel around it will weaken it, you need a wheel that has the centre further in the wheel which in effect brings the rim further out.

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vuk
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Location: Denmark

Post by vuk » Thu Nov 12, 2015 8:42 pm

Hmm. I think the rims are the same and there were no problems with the old tyre. Must be a PLY issue then?
DB 1412 1977

Guest

Post by Guest » Thu Nov 12, 2015 8:55 pm

Fit a 4 or 6 ply and see if it clears or if you still have the old tyre see what ply that one is and replace it with a new one the same. If a tyre Company fitter fitted the damaged one get them to supply and fit one the correct size/ply rating without any charge.

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db2d
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Post by db2d » Fri Nov 13, 2015 8:45 am

The ply rating is not the problem, it is clearly visible that the ' off set ' on the rim is not suitable for this tractor.
With the correct wheel rims there is enough clearance for various tyres. This is a problem that occurs inadvertently from time to time with after market spares.

broadsword
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Location: Holmfirth, Huddersfield

Post by broadsword » Fri Nov 13, 2015 12:01 pm

vuk,

assuming you haven`t done anything yet - measure the distance between the top of the wheel rim (steel rim not tyre) to the steering hub (on the wheel with damaged tyre), then swop the wheels over from the other side and measure the same this will determine whether the offset is wrong, ie if the aftermarket wheel has the wrong offset. My guess is the other wheel will be further away from the steering hub.
Do this first and it is the easiest way of determining whether it has the incorrect wheel (steel) fitted.

Don`t start fitting 4 ply 6 ply etc - it is nothing to do with ply rating - if you do the above its an easy check.

There is only 20cm difference in the width of the tyres anyway (ie 10cm each side) - like db2d says with the correct rims fitted there is ample clearance for differing size tyres.

Cheers

Andy


EDITED - WHEN I SAID 20CM OF DIFFERENCE I MEANT 20MM !!!!!! :?
Last edited by broadsword on Sun Nov 15, 2015 10:28 am, edited 1 time in total.

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bedwards1966
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Post by bedwards1966 » Fri Nov 13, 2015 7:21 pm

Tyre sizes can and do vary between manufacturers but it should not be this much. The rim looks likely to be the problem as already discussed. To check for something being bent make sure the wheels are positioned straight ahead and step back from the front of the tractor a few paces and look at the front wheels - is one leaning in more than the other?

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