Reply With QuoteThe way I read it is only 3/4 of an inch difference in width. Not a problem.
I have an old Oxford Allen mower with 2.75 x 21 tyres and ended up fitting
80/100 x 21 . They bulge ever so slightly.
TopicToaster
Hello All,
Would a 8.25 x 20 truck tyre, (8.25/R20) be a suitable replacement for a rim fitted with a 7.50 x 20 tyre?
I have two trucks rated at 1.5 tons - Imperial = 30 CWT. They were built in 1935 and 1940.
There are three tyre sizes on one truck 34 x 7 as 12 ply Olympics, after 1951 this tyre size was converted to a 7.00 x 20. The remaining tyre size on the truck is a 7.50 x 20. The last two tyres are the more modern sizing system.
I visited the Stovebolt Forum - specially dedicated to restoring old Chevrolet trucks - the 1940 is a Chevy. Some people with Stovebolt suggest fitting a 8.25 x 20 tyre. This is because the 7.50 x 20 is now getting more scarce and dearer to buy.
A 7.50 x 20 tyre bought in America is $275 USD, plus the cost of freight and Customs to get it into Australia. A current currency conversion that works out to be $400.69 Australian Dollars. Plus rust-band plus tube.... x by 14 tyres, including a spare for each truck = OMG!
Here in Australia there are 8.25 x 20 tyres available on eBay for $268 Australian Dollars.
Is the move from a 7.50 x 20 to a 8.25/R20 a size/s too far in Australia?
Kind regards
Lionel
Master
SupporterThe way I read it is only 3/4 of an inch difference in width. Not a problem.
I have an old Oxford Allen mower with 2.75 x 21 tyres and ended up fitting
80/100 x 21 . They bulge ever so slightly.
ForumSage
Yes 8.25-20 will fit 7.50-20 rims no problem, the diameter will be a little larger , hardly noticeable.
I did this on my old AR160 Inter
They still make 7.50-20 tyres in China, probably pay through the nose at Antique Tyres though
20750 | Antique Tyres
or buy from China but minimum order = 100 tyres. - there chart shows diameter & width 750R20 v 825R20 , bugger all really.
Aeolus All Position Truck Tire Hn08 750r16 750r20 825r16 825r20 900r20 1200r24 1000r20 1100r20 315/80r22.5 - Buy Aeolus All Position Truck Tire Hn08 750r16 750r20 825r16 825r20 900r20 1200r24 1000r20 1100r20 315/80r22.5 Product on Alibaba.com
TopicToaster
Hello Going Bush & The Elms 66 ,
Thank you for the replies. Yes, you are right about paying through the nose with the vintage tyre mob. They were my first step a couple of years ago. I then decided to look at a couple of USA based sites and having a think about how to buy less than 100 tyres. Today's search found the option to go to the 8.25/R20s - their price right here in Australia is much more user friendly!
Kind regards
Lionel
Super Moderator
Lionel, make sure the 8.25XR20 are not tubeless.
This forum could be invaluable to you, on many levels. Heaps of knowledge, ideas and humour there.
Historic Truck Chat - Historic Commercial Vehicle Club of Australia
Ask the same question there, could save you some dollars.
If you don't like trucks, stop buying stuff.
TopicToaster
Hello Ian,Originally Posted by V8Ian
Thanks for the information about making sure that the tyres are not tubeless. Also the tip for the HCVCA. I used to be a member of the Historic Commercial Vehicle Association Queensland some years ago.
I was doing some searching online - well more searching today to find out some information about the speed ranking of tyres. What "K" or "R" meant. K = 110 kilometres per hour and R = 170. Pretty amusing when considering the engine is a 216 cubic inch splash lubricated bit of engineering from 1940.
Kind regards
Lionel
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