Wheel truing question

Hey, so I just laced my 05 kh hub to my tryall rim because I like my 127 kh cranks. I tightened all the spokes and there is one wobble and I don’t know if it is fixable. I understand how to fix it if it wobbles side to side but my rim wobbles up in one position.

Is that just a flat spot that I can’t fix? Is there away to make it not go up in that one spot?

I hope that made sense.

“Up” is not a very descriptive term in this context.

If the rim has a flat spot (that is, it’s deflected towards the hub), you can adjust it by loosening the spokes in that area equally on both sides of the rim. If you loosen them one full turn, the rim should move about the size of one spoke thread.

If the rim has a bump (that is, it’s deflected away from the hub), you can conversely tighten the spokes in that area.

In either case, spoke tension can only correct for relatively small rim defects; if your rim is significantly out of round before you lace it up, you may get better results by physically pounding the rim into something closer to roundness (wood blocks, a vise, and a rubber mallet are useful tools) before you attempt to lace it.

Ok thanks. Yeah so I guess the rim is deflected towards the hub.

I will try loosening those spokes. The tire doesn’t rub the frame or anything so if there is a wobble would it be bad for the rim to ride it that way? I doubt I would notice it unless I was gliding really fast or something.

I probably should have checked to see if it was round before I laced it. I am not about to unlace it again to pound it or anything. I started out with a koxx wheel and a kh wheel and I unlaced both and made a new wheel out of it. It took forever.

Oh one more question, I just reused my spokes and I used the koxx spokes but when I got the wheel from a friend one spoke was missing and then I stripped one nipple and lost another so I had to use 3 spokes from my kh wheel. The koxx spokes are thicker than the kh ones so would that lead to more problems?

Riding with the rim out of round won’t hurt it; it may be noticeable when riding, however.

I would expect different-gauge spokes to behave differently in the wheel. Probably that will result in one type or the other being more likely to come loose. I wouldn’t advise mixing spoke gauges.

If your spokes are in that bad of a position, I would go buy fresh ones…

Lace the fresh ones, then get the bike shop to true it for you… unless you already know how to true the wheel…

I believe your wheel has something called a bob in it, where the hub isn’t centered within the wheel… but it could also be a flat spot.

are you sure you didn’t lace the hub off center? a fairly easy way to telll would be to measure from the rim to the flange in several places and see what happened there. I almost did that when I laced my wheeel. my nipples apparently aren’t all exactly the same length and the way I lined them up messed me up.
i found that the grooves in the spokes were a much better way of telling.
I flushed the end of the spoke up w/ the groove and tightened 3 turns, thats what worked for my wheel. idk about yours, as its prolly different, but i almost seriously screwed my rim.

i mean messed up when I say screwed… just incase you don’t catch the pun :roll_eyes:

If the tire isnt new it could easily and probably is that you just havent rotated your tire frequently enough (not like anyone does) and you have a bald spot where you hop. if its a new tire it is something with the rim and i dont know how to help you.

The hub is not off center and I did lace it right. There is just wobble in one spot. I am just going to ride it like that and if I notice it then I will try to fix it again.

It is definately not the tire because when I was tightening the spokes and seeing how true it was there was no tire on it.

I had the same problem when I was re-lacing my Alex DX32.

First it had some side wobbles, but I fixed those, then I checked how it was vertically, and I had one spot that would stick out just a little.

I loosened the spokes around it by half a turn, then tightened the spokes on the bump a full turn, which pulled the bump flat. After that I just re-trued the wheel by that spot to put it back in true.

Then, I had another bump, this time going inwards. I pretty much got it out, but there is still about a 2mm bumb there, thats hardly noticeable.

I put my tire back on, and started to ride, and you dont feel it at all, and my rim is still holding up perfectly. =p

In addition to slightly loosening the spokes at the flat spot, you should also tighten the spokes about 1-2" away on each side of the flat spot, in order to give the rim a bit more persuasion.