I do not think 1/3" and 1/4 inch one way or the other would cause the
wobble and judder you describe, though its certainly worth pursuing
remedy for such play.
Check wheel balance. I bought the portable balance from HF ($69
IIRC). Its surprisingly sensitive, allows you to rest a weight on the
rim to achieve balance before you fit it. I could only find weights
online, though they were cheap enough.
Check the run-out on your a) rims, and b) tires - i.e. eccentricity
while in rotation. I used a run-out dial, but any pointer held firmly
will suffice.
There is a reason why the Kumhos are $129 for a set of four at Tire
Rack, and mine have noticeable run-out. There was some run-out at the
rim of these 44 year-old wheels, but more at the tire, and that was
with the tires correctly seated in the rim. Check your tires are
correctly seated - look for the mounting line close to the rim edge -
it should be a consistent distance from the rim all the way around.
Find your best pair of wheels, and put them on the front.
If all your wheels are bad, find a friend with Panasports and borrow
them for a mile or two to see if they change anything.
I put my best two steel wheels, newly balanced, on the front. It
cured most of the problem, and I'm only really bothered by it when
the wheel eccentricity is co-ordinated. It soon passes in a mile or
two, as they work their way out of co-ordination.
When I have my next windfall, I'll pick up some new wires and better
tires.
Good luck
Brian
1963 TR4
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