21 inch tires have a paint mark designating either the heavy side or the light side of the tire in reference to overlapping Plies. Well question is which is it the heavy or the light side and how is the tire mounted in reference to the valve stem? A few friends have different ideas just putting it out there for a more definitive answer thanks in advance.
I believe that mark is supposed to line up with the valve stem.
Thanks Larry, that's what I believed also....
Input from others appreciated.
https://www.google.com/search?rlz=1C1CHBD_enUS737US737&ei=rQQDWq6rAoLJmwHzjozgDg &q=what+does+the+red+dot+on+a+tire+mean&oq=paint+mark+on+tires&gs_l=psy-ab.1.0.0 i71k1l22.214.171.124.42126.96.36.199.0.0.0.0.0..0.0....0...1..64.psy-ab..0.0.0....0.CDMrTCjZ 7rk
Larry has it right, so not much more input is needed, but in a little more depth, the tires were marked at the supplying factory with a balancing mark to indicate the light side of the tire. It was probably a simple/quick bubble balance test to determine the light point around the circumference. When the tires were mounted, the valve stem hardware was aligned with the balancing marks. This provided a crude balancing of the tire/wheel assembly.
Put the heavy point of the tube (valve stem) at the lightest point around the tire to replicate the factory balancing procedure.
Thanks Larry, Mark and Ward
So is the valve stem aligned directly with the red dot?
My friend owns a tire repair shop and he was telling me about Mr Teague, our high school principal, bringing his Model A there. He said it took all day to do the tires. Could you not use a tire machine? The new machines clamp to the rim and cars have rims over 21" now. I know I mount clinchers and 14" and 16" tires by hand and it's no big deal. Breaking the 14" and 16" tires down is the only hard part. Looks like you could put one bead on then insert the tube, then use the machine for the other. He said flaps gave him the problem.
Model A wire wheels are drop center, like the 1926-27 Model T wire wheel. Both the 21 " and 19" Model A wheel uses a gutter strip to cover the welded spokes. Like the 1926-27 Model T wire wheel, flaps are not to be used, as per Ford.