17" Magnum 500's
72,
Your 71 Ford truck has a harsher ride..............because it has stronger springs! It is a work horse designed to carry heavy loads. Apples to oranges comparison. And it seems you have a reading problem.
I said in post #44 that if the matching suspension components that are used with a 14" in wheel are used with the 17" wheel, the ride will be softer.
Oh, so
NOW the suspension matters? I thought the sidewall of the tire was the only thing that absorbed bumps? So now you think the suspension has a purpose?
OF COURSE the truck rides harsher, and it has NOTHING to do with the sidewall height. Good grief man.
And, no, I read what you said about suspension components from the 17" wheels being used with 14's. And again, you missed the point completely. The capabilities of the shocks have to be matched to the input loads and frequencies they're damping. Which are different between a 14" wheel and a 17".
So no, using the shocks that work best with 17" wheels may not make the ride with the 14" wheels softer. Just like putting 14" wheels on a modern car wouldn't result in a softer ride, just a sloppy one.
Drivers who have overinflated their tyres notice the ride is harsher, you feel the bumps more.
Air is compressible & the extra weight of air in the tyre is not able to compress as much from the road shocks...so you feel the bumps more. Exactly the same principle is involved with less air in the 17" wheel compared to the 14"wheel.
Like I said, if this is the level of your physics knowledge, you've got no business thinking you know stuff. The
weight of the air? Inconsequential. Over-inflating the tire changes the force exerted on the inside of the tire surface (PSI x surface area). And changes the surface area in contact with the road.
And no, it is not at all the same principle as the shorter sidewall. By your flawed logic if I kept the sidewall height the same, but made the overall diameter of the tire larger, I'd get a better ride because there was more air in the tire. Not what happens.
And just FYI, a 275/35/18 like on the front of my car has more air volume inside it than a 205/70/14. So, less air isn't the issue.
My primary objection to anything larger than 15" on pre-1980 classics is that their suspension is not designed/calibrated for larger rims/lower cross section tires. My '66 Barracuda has 17 Torq-Thrust with 225 45R17 Yokohamas mounted on them. It rides terrible compared to my first '66 that had 15" with Goodyears mounted on it. The lower cross section tires do not have enough compliance to absorb bumps etc that the larger 15 inch rubber has. I will change them out ASAP when tire time comes around. A set of steel Magnums in 15" is perfect for me.
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You've fallen into Bewy's trap. You start off with a good point, the original suspension as it was designed was not intended for shorter sidewall tires. But that doesn't mean it's not
capable of handling it with the proper tuning. The original suspension is actually very capable, and with some small changes can easily deal with the shorter sidewall heights. Tires do absorb impacts, but you literally have shock absorbers to do that job if you just bother to run the right ones.
I would bet that simply changing out the shocks you have on that car would dramatically change its ride. Lemme guess, you're running KYB's?