MTFCA Forum

Sorry folks , more questions ( I’m a new owner ) and I know many of you have the answers .
Looking at either the 600x20 or the 650x 20 tires .
About $125 difference X 2
It’s not a lot in American but it’s a fair amount in Canadian difference plus shipping .
The truck has 650’s (32x6)
I dont want to mess this up and then try to figure what to do with tires that wont fit.
It’s a 27 TT
I can’t air the truck up to find out if the backend sits high or level .( both flat)
Does anyone know if the height diff is significant ?
Thanks in advance vince

These are the two
https://www.snydersantiqueauto.com/sear ... =lucas+600
or https://www.cokertire.com/tires/firesto ... tread.html

i know there is 2' diff but thats only 1" drop for the 600"s

thanks Vince

Vince, I thought the difference between 6.00 and 6.50 tyres was 1/2". That would mean the truck would sit just 1/2" higher on 6.50 tyres, hardly enough to be noticeable.

Allan from down under.

The 6.00 or 6.50 refers to section width. Diameter might be the same or different. The tread width is usually less than the section width. Wider section tires are typically larger in diameter, but may not be. Going from a tire with a 33" diameter, for example, to one of 34" diameter will raise the vehicle about 1/2" and reduce engine speed at any given road speed by 2 to 3%. My preference would be the larger tire. Either would work, as long as they fit the rim correctly. Some tire maker websites give actual tire dimensions, including diameter.

No need to air them up. You can measure the thickness of back tires at the top and add the inches from the ground to the rim at the bottom to determine how high it sits. Jim Patrick

Tire specs from the links you provided above. 2 inch difference in diameter
--
--
example: "width" of the tire not the rim.

Adding 2" diameter will raise the vehicle about 1" and allow a little higher road speed, maybe 5%. Most trucks sit higher at the back unless loaded. On dual rear wheels, clearance between tires may be an issue with oversize tires.