Wheel not fitting
#1
Senior Member
Thread Starter
Wheel not fitting
ive had a 700c wheelset lying around for a few years from and old road bike that the frame cracked and became useless. i think i tried selling them once or twice, but parts are a hard sell. so instead i figured id pick up a bike that was missing the wheels, slap in these and sell the full bike, which should be easier to sell. i picked up a trek hybrid the other day with 700c wheels, but when i went to put in my wheels just now, the back one doesnt align properly, its off center, and theres a lot of extra spacing between the hub and the dropouts. im guessing hubs/axles meant for road bikes and hybrids are different...? is there an easy way to get this to fit and align properly? perhaps washers to fill in the space?
thanks.
(in the pic i had tightened down the nut on the right, there was more space there initially.)
thanks.
(in the pic i had tightened down the nut on the right, there was more space there initially.)
#2
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I think you installed a 126 mm hub in a 130 or 135 mm frame.
#3
Senior Member
Thread Starter
#4
Really Old Senior Member
The "correct way"-
Add the needed spacers to the NDS under the lock nut.
Redish the wheel, which is relatively easy for this scenario.
Just equally tighten the NDS spokes until the rim is "centered".
This also results in a more symmetrical, stronger wheel.
The usual problem is corroded nipples.
Add the needed spacers to the NDS under the lock nut.
Redish the wheel, which is relatively easy for this scenario.
Just equally tighten the NDS spokes until the rim is "centered".
This also results in a more symmetrical, stronger wheel.
The usual problem is corroded nipples.
#5
Senior Member
Thread Starter
The "correct way"-
Add the needed spacers to the NDS under the lock nut.
Redish the wheel, which is relatively easy for this scenario.
Just equally tighten the NDS spokes until the rim is "centered".
This also results in a more symmetrical, stronger wheel.
The usual problem is corroded nipples.
Add the needed spacers to the NDS under the lock nut.
Redish the wheel, which is relatively easy for this scenario.
Just equally tighten the NDS spokes until the rim is "centered".
This also results in a more symmetrical, stronger wheel.
The usual problem is corroded nipples.
#6
Really Old Senior Member
Assume the wheel is dished correctly for its current spacing.
The new dish will be off by 1/2 of the amount of spacing you add.
It's possible the dish has "migrated" in your favor to some extent and you end up very close to correct.
It seems a lot of generic, machine built rear wheels shift that way as they settle in.
You can only tell by measuring.
Flipping the wheel in the drop outs and see if the rim is the same distance from some convenient ref. point on the chain stay will get you quite close.
The new dish will be off by 1/2 of the amount of spacing you add.
It's possible the dish has "migrated" in your favor to some extent and you end up very close to correct.
It seems a lot of generic, machine built rear wheels shift that way as they settle in.
You can only tell by measuring.
Flipping the wheel in the drop outs and see if the rim is the same distance from some convenient ref. point on the chain stay will get you quite close.
#7
Senior Member
Thread Starter
Assume the wheel is dished correctly for its current spacing.
The new dish will be off by 1/2 of the amount of spacing you add.
It's possible the dish has "migrated" in your favor to some extent and you end up very close to correct.
It seems a lot of generic, machine built rear wheels shift that way as they settle in.
You can only tell by measuring.
Flipping the wheel in the drop outs and see if the rim is the same distance from some convenient ref. point on the chain stay will get you quite close.
The new dish will be off by 1/2 of the amount of spacing you add.
It's possible the dish has "migrated" in your favor to some extent and you end up very close to correct.
It seems a lot of generic, machine built rear wheels shift that way as they settle in.
You can only tell by measuring.
Flipping the wheel in the drop outs and see if the rim is the same distance from some convenient ref. point on the chain stay will get you quite close.
I adjusted the nds nut out so that I could sit it in what seems to be the proper spacing once I get spacers to keep it there, and that seemed good. Pedaled and looked like the brakes would hit it evenly. Anything else to be concerned about?
#8
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As you know, if a wheel has a small section that is out of true - too far left or right - you can tighten a spoke to bring the rim closer to the reference surface on the side of the hub that the tightened spoke is on. Or you can loosen a spoke to let it move away from the side the spoke is on. What if you tightened all the spokes on the left side of a wheel? The rim would move left. If it had started out perfectly between the references surfaces, now it will be off. Still true, but too far left or right.
For the back wheel, you have a freehub or cluster. This means that the hub flange is moved toward the centerline of the hub on that side. If you centered the rim between the hub flanges, it would be too close to the non-drive-side reference surface, and too far away from the drive side ref surface. So you typically leave the non-drive side spokes a little loose, and tighten teh spokes on the drive side. This moves the rim towards the drive side. By adjusting the relative spoke tension on the left and right, you can center your rim. This process is called dishing.
If you add spacers under the locknuts, you are moving the reference surface on that side, and so if your wheel is dished properly (e.g. centered) initially, after you add the spacers you will a have improperly dished wheel. So you need to tighten all the spokes on the side you add the spacer to. (A little bit, then check. And if the DS spokes are already a bit taut, you could loosen the NDS spokes. )
#9
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Is it lens distortion or is that axle bent? Andy
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AndrewRStewart
AndrewRStewart
#10
Really Old Senior Member
Look at the angle of the spokes between the rim and the hub.
Notice the DS spokes don't have as much angle?
7 speed & less, dish isn't too bad.
When you go to 8 speed & more, it is more pronounced because the stack of cogs is wider.
#11
Senior Member
Thread Starter
Ok, thanks for the explanation, I get what you're saying now. I've never taken a really close look at that angle of a wheel before, but I had always thought that the wheel was basically centered over the hub with the spokes on both sides pretty much evenly angled. It never occurred to me that you could/ should move it off center. Wouldn't it better, if necessary, to shift the hub on the axle in order to get the wheel centered? (And then add spacers to both sides if needed. ) I would think that having the spokes at different angles wouldn't be as secure.
I did notice that too, that the axle looks bent in the pic, but I think it's just the angle, I don't think it's actually bent.
I did notice that too, that the axle looks bent in the pic, but I think it's just the angle, I don't think it's actually bent.
#12
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You have a very sharp eye...
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#13
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The "correct way" is to have some specs to follow:
https://www.mrrabbit.net/docs/freewhe...OLD_sizing.pdf
I've posted this here several times now, surprised people haven't book marked it yet to save time when answering.
=8-
https://www.mrrabbit.net/docs/freewhe...OLD_sizing.pdf
I've posted this here several times now, surprised people haven't book marked it yet to save time when answering.
=8-
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life