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Old 11-13-11, 04:27 AM   #1
chandltp
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nokian mount and grounds

So I've have 2 separate sets of rims (steel rim, 90's era mountain bike), and for the life of me I've never been able to get them mounted 100% even. I can spend 10 minutes trying to get them even, but pushing and pulling, I always seem to end up with a low spot.

Last year I thought it was the rims, but I have a replacement pair this year with the same problem.

It doesn't seem to matter much in the winter, since my speed is low and I rolled with them that way all last year without issues.

Has anyone else had that problem? It almost seems like the bead diameter isn't quite large enough for the wheel. I inflated them to 80 PSI (max of 45) to see if the bead would set all the way around. I put on soapy water. I didn't have any talcum powder to try.
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Old 11-13-11, 09:24 AM   #2
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Steel rims? Hopefully your replacement rims aren't steel too.

What size rim is it? Hopefully the rims support a hooked bead.
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Old 11-13-11, 12:54 PM   #3
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So I've have 2 separate sets of rims (steel rim, 90's era mountain bike), and for the life of me I've never been able to get them mounted 100% even. I can spend 10 minutes trying to get them even, but pushing and pulling, I always seem to end up with a low spot.

Last year I thought it was the rims, but I have a replacement pair this year with the same problem.

It doesn't seem to matter much in the winter, since my speed is low and I rolled with them that way all last year without issues.

Has anyone else had that problem? It almost seems like the bead diameter isn't quite large enough for the wheel. I inflated them to 80 PSI (max of 45) to see if the bead would set all the way around. I put on soapy water. I didn't have any talcum powder to try.
I have M&G's on my Ritchey vantage rims (rebuilt my wheels in 2003ish with the original type rims that came with the 1989 bike
since they lasted so long), and they mount fine.

I do have a new specialized Nimbus I believe it is called and it has a definite high spot on the tire.
And I tried to reseat it a few times, but it is always there. I should probably take it back but it is so
hard to mount I am leaving it.
I am using it with a tube on a tubeless rim so that might be an issue but I have run that set up
n different tubeless rims without that problem.
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Old 11-14-11, 03:42 AM   #4
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If it rides smooth don't worry the bead line doesn't have to be perfect.
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Old 11-14-11, 07:27 AM   #5
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Steel rims? Hopefully your replacement rims aren't steel too.

What size rim is it? Hopefully the rims support a hooked bead.
Yup, replacements are steel. After about 2 more winters, this bike will probably be due for one of my other winter bikes waiting to make it into the rotation. Those are aluminum rims with cantilever brakes instead of the sidepull I'm running now.

How does one measure a rim? These are generic 26" MTB rims from the 90's that came on Huffy's and the like. There are no markings on them that I can find.
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Old 11-14-11, 07:28 AM   #6
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If it rides smooth don't worry the bead line doesn't have to be perfect.
I had it out this morning, and it's definitely noticeable above 12ish MPH.
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Old 11-14-11, 10:47 PM   #7
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The first time mounting a new set of M&G's can be a bit trying. I lube the bead seat with powdered motor mica. Motor mica is a dry lube used on some electric motors. It doesn't draw grit like a wet lube does. You can get it from ammunition reloading suppliers. If I didn't have that I would try talc or graphite.
After lubing, I'll inflate the tires to about 5 psi, then I'll wrestle with the tires till I get the bead as even as possible. Then when you take them up to 45-60 psi the bead usually pops right in.
It can be a challenge. Just try not to cuss, and don't use a screwdriver or anything like that to pry the bead out of the low spots. Keep the air pressure way down low and roll the bead out by hand pressure only.
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Old 11-15-11, 06:43 AM   #8
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The first time mounting a new set of M&G's can be a bit trying. I lube the bead seat with powdered motor mica. Motor mica is a dry lube used on some electric motors. It doesn't draw grit like a wet lube does. You can get it from ammunition reloading suppliers. If I didn't have that I would try talc or graphite.
After lubing, I'll inflate the tires to about 5 psi, then I'll wrestle with the tires till I get the bead as even as possible. Then when you take them up to 45-60 psi the bead usually pops right in.
It can be a challenge. Just try not to cuss, and don't use a screwdriver or anything like that to pry the bead out of the low spots. Keep the air pressure way down low and roll the bead out by hand pressure only.
Thanks, I'm going to deflate and try it with talc. Although I was wondering if the chalk bottle for my chalk line would work, since the tip seems it would be easier to work in.

I didn't stop at the 5 PSI range, so I'll do that tonight and see what happens. I had it up to 90 PSI and it didn't pop into place.

I guess I just didn't have enough patience this weekend.
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Old 11-15-11, 06:15 PM   #9
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Well, not matter what I did had a low spot. I tried on the front and the back. I'm guessing the rims just are a little to big. I'm hoping it's less obvious when I drop it to 30 PSI for the snow. I've given up for now, I think.

I also learned that when I get frustrated I do dumb things (OK, so I knew that, but this time I learned another thing not to do). I decided that I'd push the pressure up higher and took it up to about 110 PSI. My rim didn't like that. I tried to turn it and it was pressed against the brakes. I let the air out and it's a bit distorted now, but seems ride-able. If I wasn't frustrated I would have known this was a really bad idea.. but I used the bigger hammer approach.

I experienced the first time having slime clog a valve. Finally got it to work again... after I swapped it out with a flatted tube I had around.
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Old 11-15-11, 08:06 PM   #10
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M & G's are stiff in the side wall. A wide rim will exaggerate installation issues.
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Old 11-16-11, 06:42 AM   #11
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M & G's are stiff in the side wall. A wide rim will exaggerate installation issues.
I figured if I get enough patience I'll give it another try this weekend, but it was no better this morning. I think I'll just lower the PSI to dampen the hop and live with it if that doesn't work. And get my backup winter bike ready to go in case I have a rim failure due to my frustration induced stupidity.
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Old 11-17-11, 02:47 AM   #12
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All my studded Nokians have been on the tight side. Stopped running them on my ceramic rims due to the amount of tire lever work required, particularly during a roadside flat repair. But I've never had any issues with getting them seated.
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Old 11-18-11, 10:59 PM   #13
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Thanks for the advice everyone. It just took a lot of patience to smooth out the high spots into the low spots. After 2 hours (which is absurd considering I can do my daily commuter in about 10 minutes), I got them to where I'm happy with them. Not perfect, but good enough. I'm really hoping my rims on my up and coming winter bike are more forgiving.
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Old 11-19-11, 05:19 PM   #14
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Any time I have a problem with seating tires on rims, I use soapy water all around the tire bead, then over inflate them to get them seated. The soapy water gives enough lubricant to get the bead seated up on the rim. I have tried baby powder but I find soapy water does the trick.
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