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Classic Truck Discussion Forum

8.25X20 Conversion to Modern Tire Size

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Prairieplow07

03-01-2020 08:06:59




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I want to change the tires on my 1962 GMC4000 to a modern tire. I found that 9RX22.5 is the exact replacement. However, I am now finding that 9RX22.5 are very hard to find and very expensive. Is there another modern tire size that will replace the 9RX22.5? Finding rims is another challenge! (10-hole / 8.75 circle / 6.25 hole)

Like all the posts I read, the tires are worth more than the truck.




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John Saeli

03-24-2020 05:51:22




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 Re: 8.25X20 Conversion to Modern Tire Size in reply to Prairieplow07, 03-01-2020 08:06:59  
8:25X20 tires are plentiful, economical, in comparison, and available in traction and steer. We just put 4 - 8:25X20 rear traction tires on our 1980 C50. I also use 8:25X20 steer tires on our CASE-IH Grain drills in place of the original 20" drill tires which are only 4 ply and very expensive.



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Jim in Sask

03-01-2020 17:48:49




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 Re: 8.25X20 Conversion to Modern Tire Size in reply to Prairieplow07, 03-01-2020 08:06:59  
I went through something similar this past summer - the back tires on my 1981 Chev C60 were shot (9.00x20). Between new rims plus radial tires the cost was too much. I didn't care much for Chinese tires but my local shop I was dealing with said he'd put quite a few Samson tires on trucks with good results. 9.00x20 bias was available so I went with them and have been happy with the results. I don't know if they make an 8.25x20 though.

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