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Wheels without tires appear true but with tires, its a bit out?

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Wheels without tires appear true but with tires, its a bit out?

Old 07-28-16, 01:34 AM
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Wheels without tires appear true but with tires, its a bit out?

Hello there, this is my first post and thread

I need you guys attention please

I just bought new wheels set, its look good so far, nothing wrong, its American Classic 420 Aero 3 2016

When I mount tires on it and check if its seat correctly, I notice wheels go a bit out of true, this is normal?

I have 2 tires set, one with Schwalbe One and another is Continental GP4KS. Both not the same, Schwalbe One I can get more smooth and true wheel when I mounted it but not with Continental GP4K2, I got strange a bit out of true when mounted Continental. . . I just "what the hell is this? Did I damaged my rim already?" for a while

I am not that strong so I able to bent rim or even crack it . . . so its out of question if I apply too much force? (its possible at all? by the hands)

I make sure I seat it correctly and carefully, somehow I still wonder if tires can make true wheels out of the box go out of true when mounting tires? Should I bother it?

If wheels without tires appear true and round, nothing side-to-side without tires (a little at brake surface but I heard American Classic used to make wheels with braking surface lumpy which make you brake more powerful than smooth brake surface/machined so I can live with it)

Should I bother if tires on and its goes a bit side-to-side?

Thanks in advanced and please forgive my bad gamma, my English is not my mother languages
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Old 07-28-16, 02:25 AM
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With the tyres mounted and inflated spin the wheel and watch the braking surface where it runs through the brake pad area that will tell you if the rim is running true ignore what the tyre is doing, tyres are pliable beasts and are never perfect in fact some are horribly out of spec just be sure they are seated correctly around the rim when inflated then get on that bike and head for the hills..
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Old 07-28-16, 02:30 AM
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It's possible that when you spin the wheel without a tire mounted, the brake track looks true, but if the tire is not symmetrical or bulges unevenly, once the tire is mounted, the spinning tire might look un-true (even though the brake track still looks true).

It's also possible that the rim is true but with uneven spoke tension, so once the tire is mounted and pumped up, the rim is "compressed" and goes un-true.
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Old 07-28-16, 05:14 AM
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OK GUYS PROBLEM SOLVED!

Its tires that cause my wheels to go out of true! unbelievable!

My wheels is American Classic 420 aero 3 2016 (the latest one with both clincher&tubeless compatible, not old model with only clincher setup).

I spent 4 hours experimenting and inspecting by swapping Schwalbe One and Continental GP4KS2 tires like 4-5 times.

I found that Schwalbe One will give me perfectly smooth round and true when fully inflated with no problems at all while Continental is odd one that give me out of true by a little 0.3-0.5mm measured by naked eye and brake pad.

Why this happens is unknown reason . . . now I stick with Schwalbe One, I don't want to risk permanently damaging my precious wheels because Conti caused my wheels to go a little out of true.

This is very odd case for me (and surprised, American Classic does not give warning or specific tires to be use with their wheels at all)

Normally ALL tires manufacturer should be zero problems, right? I didn't say Conti give me performance problem, its roll well but its wheels that go out of true by mounting Conti tires which is very very odd!

While Schwalbe One gave me perfect round and true . . . now I am happy and my mind is at ease.

Thanks everyone for opinion and reading.
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Old 07-28-16, 08:20 AM
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It's not due to the tire brand. Like k kibbler pointed out, if a rim goes out of true when a tire is inflated, the root of the problem is likely something like uneven spoke tension. When you inflate the tire, the rim is under compressive force from the air pressure in the tire. If the spoke tension isn't roughly equal, some spokes will resist deflection more or less than others, causing the wheel to go out of true to some degree.

You can check easily enough, even without a tool like a spoke tensiometer. Deflate the tire to remove the forces from air pressure, then tap or pluck the spokes and listen for pitch. Evenly tensioned spokes should also be even in pitch. If spoke tension is uneven, spokes under higher tension will be higher in pitch, much like the strings of a guitar.
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Old 07-28-16, 08:56 AM
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Originally Posted by Altimis
. now I stick with Schwalbe One, I don't want to risk permanently damaging my precious wheels because Conti caused my wheels to go a little out of true.

This is very odd case for me (and surprised, American Classic does not give warning or specific tires to be use with their wheels at all)
Your wheels will not get damaged from any particular tire.
It would be silly for AC to warn against a non-problem.
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Old 07-28-16, 09:52 AM
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One thing to consider is if you replace spokes, it is highly advisable to replace with the exact same spokes and brand/model. If you mix spokes, especially of different gauges then you are inviting problems. Also, don't mix butted and non-butted spokes. Other than that, always true to the rim not the tires.
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Old 07-28-16, 01:26 PM
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I worked at a shop in the early '80s and would notice this "phenomenon" on some wheels, so it's not the first time someone has thought they were crazy.
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