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Old 16-09-2019, 03:09 PM   #1
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Default Tractor tyres question,

Help please

I need four tyres to fit one of these Fiat SPA tractors.
The tyres on there at the moment are shot, and are ‘11.25 x 24’ also has 1200% x 300% - which is a complete mystery to me.

I found on the interweb thingy a reference to how tyre sizes changed post war and the recommend a different size entirely - now, I am really confused

Any help or advice from tyre gurus, or just ordinary clever people greatly appreciated.

Thanks
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Old 16-09-2019, 03:16 PM   #2
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Originally Posted by mr slug View Post
Help please

I need four tyres to fit one of these Fiat SPA tractors.
The tyres on there at the moment are shot, and are ‘11.25 x 24’ also has 1200% x 300% - which is a complete mystery to me.

I found on the interweb thingy a reference to how tyre sizes changed post war and the recommend a different size entirely - now, I am really confused

Any help or advice from tyre gurus, or just ordinary clever people greatly appreciated.

Thanks
I've no idea - hopefully someone more knowledgeable will answer - but fascinating how tyre sizes have changed/evolved.

Worth asking on one of the 'military vehicle' sites Mark?

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Old 16-09-2019, 03:18 PM   #3
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I think that the evolution information you’ve found is a bit of a red herring. That’s “common sizes” rather than what will fit on your rims. You still need tyres that will fit on 24” rims, but are relatively narrow and skinny like the originals. An 11.2R24 might do, which is in modern terminology a 285/85R24, but you might need to get a single one in to your local tyre place to trial fit before committing to a full set. I’m not sure what tread patterns are going to be available, but a good starting point is Bigtyres here: https://www.bigtyres.co.uk/tyres.htm...&tyre_size=196
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Old 16-09-2019, 03:23 PM   #4
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...hopefully someone more knowledgeable will answer...
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Originally Posted by GlenAnderson View Post
I think that the evolution information you’ve found is a bit of a red herring. That’s “common sizes” rather than what will fit on your rims. You still need tyres that will fit on 24” rims, but are relatively narrow and skinny like the originals. An 11.2R24 might do, which is in modern terminology a 285/85R24, but you might need to get a single one in to your local tyre place to trial fit before committing to a full set. I’m not sure what tread patterns are going to be available, but a good starting point is Bigtyres here: https://www.bigtyres.co.uk/tyres.htm...&tyre_size=196
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Old 16-09-2019, 03:39 PM   #5
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I've no idea - hopefully someone more knowledgeable will answer - but fascinating how tyre sizes have changed/evolved.

Worth asking on one of the 'military vehicle' sites Mark?

Good idea, thanks - or even tractor forums I guess

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I think that the evolution information you’ve found is a bit of a red herring. That’s “common sizes” rather than what will fit on your rims. You still need tyres that will fit on 24” rims, but are relatively narrow and skinny like the originals. An 11.2R24 might do, which is in modern terminology a 285/85R24, but you might need to get a single one in to your local tyre place to trial fit before committing to a full set. I’m not sure what tread patterns are going to be available, but a good starting point is Bigtyres here: https://www.bigtyres.co.uk/tyres.htm...&tyre_size=196
Thanks Glen, I will look into that.
I doubt I’ll get the correct tread, but a turf tyre may do the job.
Appreciate the metric conversion, that helps enormously
Thanks again
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Old 16-09-2019, 03:50 PM   #6
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Try these guys:

http://www.kirkbytyres.co.uk/

I was on their site (the place, not the website) a month or two ago. I believe the owner is a local lad. I got talking to his mate (the fixer), who's worked there since the beginning. A top bloke, but I can't for the life of me remember his name.
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Old 16-09-2019, 04:47 PM   #7
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280/85 R 24 is the correct metric alternative I think. It might be tough finding something that isn’t massively aggressive though, with huge tractor style mud cleats.

These might do: https://www.bigtyres.co.uk/tyres/tur...ro-r-3-tl.html

An alternative might be a 12.00 24 truck tyre like this: https://www.bigtyres.co.uk/tyres/tru...-160-156k.html
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Old 16-09-2019, 05:22 PM   #8
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Try these guys:

http://www.kirkbytyres.co.uk/

I was on their site (the place, not the website) a month or two ago. I believe the owner is a local lad. I got talking to his mate (the fixer), who's worked there since the beginning. A top bloke, but I can't for the life of me remember his name.
Brilliant - those don’t look too ‘aggressive’

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Originally Posted by GlenAnderson View Post
280/85 R 24 is the correct metric alternative I think. It might be tough finding something that isn’t massively aggressive though, with huge tractor style mud cleats.

These might do: https://www.bigtyres.co.uk/tyres/tur...ro-r-3-tl.html

An alternative might be a 12.00 24 truck tyre like this: https://www.bigtyres.co.uk/tyres/tru...-160-156k.html
Good call on the truck tyres, but I really don’t imagine this being a high miler - it wont have to do much more than crawl onto a trailer

Those Turf tyres are my favourite so far




Thanks guys, appreciate the help
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Old 16-09-2019, 05:49 PM   #9
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Quote:
Originally Posted by GlenAnderson View Post
280/85 R 24 is the correct metric alternative I think. It might be tough finding something that isn’t massively aggressive though, with huge tractor style mud cleats.

These might do: https://www.bigtyres.co.uk/tyres/tur...ro-r-3-tl.html

An alternative might be a 12.00 24 truck tyre like this: https://www.bigtyres.co.uk/tyres/tru...-160-156k.html
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Brilliant - those don’t look too ‘aggressive’



Good call on the truck tyres, but I really don’t imagine this being a high miler - it wont have to do much more than crawl onto a trailer

Those Turf tyres are my favourite so far




Thanks guys, appreciate the help
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Old 16-09-2019, 06:45 PM   #10
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I think the only thing that you would have to worry about with the turf tyres is that they’re only 6-ply. They might not have the load rating to take the weight of the tractor, no matter how slow you’re planning on driving.
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