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Different tread patterns on same vehicle?

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thermidorthelobster:

--- Quote from: "Henry Webster" ---101s are permanent 4x4 as std, so I would guess it is at least permanent 6x4
--- End quote ---

Pretty much - you can select to drive the rear two, the front four, or all six, but most of the time it's the front four.

Sheddy:
As has been said, mixing cross-plys and radials on the same axle is illegal.

Different size tyres on the same axle is illegal.

Different tread patterns on the same axle, whilst not illegal, can cause problems if it is the steering wheels.  I had a problem with one of my trucks which kept pulling to the left.  We checked the tyre pressures, toe in and tracking but all were O.K.  The problem turned out to be that there was a different tyre on the nearside to the offside, that was all that was needed to cause the steering to pull.

Hope that helps.



.

Lee_D:
bearing in mind any one who stops you will be blind for at least 30 minutes I'd not panic  :wink:

If it were I doing the milage you are about to do I'd be looking at what the availability is in the main citys / towns that you are going to and try to get a set of the same here. You can alway use the old ones as spares like Chris and helen did just taking the tyres and putting them on to the spare rim if the need arises. Have you got a good tyre lever and breaker bar? Hi lift will break the bead for you. Get some practice in ready! Carrying two carcases will keep the weight down, you aleady have two spares so fingers crossed you won't need any but best to be prepaired.

Lee

thermidorthelobster:
Thanks all for information.

The truck already has more than one different tyre type on it, but the tread patterns are the same.  They're all cross-ply.  I'm reliably informed by a guy who imports them that (unlike 900x16s) 10.5x20s are manufactured to a standard size, pretty much, so there shouldn't be any real difference in size over and above what you'd normally get from worn or unworn tyres.

So I think I'll buy two or three of these Czech tyres in the AT-type pattern, and try and keep them on the same axle at least!  Probably the front one as it needs the grip to get round corners...

thermidorthelobster:
I got a hefty set of tyre levers from Matt Savage, and I'm going to practice on the new set I get, I'll try to fit them myself...  (the levers have already proven useful for getting out a recalcitrant oil seal.)

I don't think I'll have much choice about what I buy, as the size seems unusual.  But I'm expecting the African roadside tyre places to be rather expert at mending whatever mangled heap of rubber I throw at them.  I'll take plenty of spare tubes.

By the way, anybody know who sells spare tubes to fit on a 10.5x20 tyre?  :D

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