Same size tyres but different

[BlakMoth Avid PP Poster! Find all posts View Profile Close BlakMoth]

Ok so now after picking up the freebies from Leachy last week I now have lots of rims with three, maybe four different size tyres.
The four on the Prado are Continental Cross Contact ATs 265/65/17. The spare is still the Grandcrap 265/65/17
The three on my camper are 265/70/17 Mickey T's ATZs all on Prado Alloys.
The three from Leachy are 265/70/17 Mickey MTZs on Sunny steelies.
Obviously the MIckeys are bigger due to the 70 profile but the muddies are a fair bit bigger than the all terrains. Why is that??
I was hoping to change the tyres on the Prado to KM2's by Xmas but now am unsure whether they will be a different size diameter again.
I know I can't use the 70's as a spare on the car until I change the car tyres over to a 70 profile but will it be ok to use either the AT or MT as spares then?
Hoping I don't have to go out and buy 8 or 9 new tyres (so the car, trailer and one more spare all match) as the wife will surely murder me in my sleep.
Did I ramble on too much? Hope someone can shed some light on this for me as I'm confused.


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[AJ120 Out of control poster! Find all posts View Profile Close AJ120]

I wouldn't say you "can't" use a 70 series as a spare with 265's, its not ideal but diffs allow wheel to spin at different speeds so in a pinch you could do it.

Most manufacturers have exact specs on their tyres, so track them down and compare diameters of the KM2's to your Mickeys and see how close they are.

Cheers Andrew

[BlakMoth Avid PP Poster! Find all posts View Profile Close BlakMoth]

Thanks Andrew. Why would the Mickey muddies be a bit bigger than the all terrains though? They are the same size tyre and same manufacturer.


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[AJ120 Out of control poster! Find all posts View Profile Close AJ120]

Thanks Andrew. Why would the Mickey muddies be a bit bigger than the all terrains though? They are the same size tyre and same manufacturer.


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Don't really know, tyre sizes are more of a guideline than an actual rule (said in my best pirate voice) they vary a bit in diameter from brand to brand so why not from AT to MT in the same brand?

Cheers Andrew

[mjrandom Out of control poster! Find all posts View Profile Close mjrandom]

As per AJ look up the specs on the manufacturer's website. They all vary. For example the 275/65 BFG ATs I had previously on the 120 were not 275 wide at the widest point of the carcass and the tread was only about 225 wide. The Scorpions are wider than 275 with about 250 tread. The BFGs were slightly taller than the Scorpions too. The 275s on the GTS are about 295 wide at the widest point and have more than 275 tread.

[BlakMoth Avid PP Poster! Find all posts View Profile Close BlakMoth]

Now that's confusing haha. Thanks MJ


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