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having a strange problem with putting on a new tire

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having a strange problem with putting on a new tire

Old 03-12-09, 10:32 PM
  #1  
MrBearSir
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having a strange problem with putting on a new tire

Old tire and new are 25-622

New tube: 700 X 18-23

Problem: Once I put everything on and pump it up, I can only physically take it to about 60-70psi (abnormal and after which is too difficult to push in any more air), and the tire is 'out of true' and all wobbly and strange.

Note: the wheel itself remains true.
Also: the new tube appears to be too large, but this happens even with the previous tube that used to fit fine

I'm semi new to cycling so if there's some obvious mistake here please help.

Last edited by MrBearSir; 03-12-09 at 10:35 PM.
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Old 03-12-09, 10:36 PM
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Your tire is a 700 x 25?
What brand of tire is it?
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Old 03-12-09, 10:41 PM
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Actually the new one is a Specialized armadillo elite 700x23 and the original was a Bontrager Select 700x25
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Old 03-12-09, 10:43 PM
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Good tires.
Very strange problems?
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Old 03-12-09, 10:46 PM
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Yeah. Most frustrating thing ever. ON TOP OF THE FACT that I got two flats within about a mile of each other today on my first ride with my brand new bike (on the old tires).

Any thoughts or suggestions? I'm desperate. Must. Ride. Successfully tomorrow.
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Old 03-13-09, 06:52 AM
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1. You can't be too careful when installing your inner tube. Inflate it just enough to give it some shape before stuffing it into the tire. Be VERY careful not to catch the tube under the tire bead. That's my guess what's causing your tire to both look wobbly and flatten easily. After installing both beads of your tire onto the rim, push the valve stem in toward the hub to be sure the thicker part of the tube isn't holding the tire bead out.

2. What are you using to inflate your tire? All mini pumps (I have to use a technical term here) SUCK. It's only a matter of how badly. The preferred pump for carrying on your bike is a Topeak Road Morph.
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Old 03-13-09, 07:02 AM
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Originally Posted by Retro Grouch View Post
The preferred pump for carrying on your bike is a Topeak Road Morph.
Provided you don't care about weight.

On the other hand, you can use a workable frame or mini pump while riding. And a real floor pump at home.
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Old 03-13-09, 07:20 AM
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Originally Posted by Metzinger View Post
Provided you don't care about weight.

On the other hand, you can use a workable frame or mini pump while riding. And a real floor pump at home.
If I cared that much about weight, I got 20lbs I could shave off my fat butt rather than the couple of extra grams a road morph weighs compared to other frame/mini pumps. The road morph is useful, the fat is just fun.
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Old 03-13-09, 07:27 AM
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Originally Posted by chipcom View Post
If I cared that much about weight, I got 20lbs I could shave off my fat butt rather than the couple of extra grams a road morph weighs compared to other frame/mini pumps. The road morph is useful, the fat is just fun.
+1 here.

I had a problem with a cheap tire once. It was a huge pain. I'd put it on, its all seated on the rim ok, then air it up, in about 10 minutes, riding it or not, it would fly up off the rim, the tube exposed, and pop the tube. After like 3 tubes, I took it back and begged them to fix it. They did. *shrug* could be what you have?

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Old 03-13-09, 07:35 AM
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^If I lost 20 lbs of fat, I'd be quite dead.

But my main point was intended to be that no portable pump can provide anything near the performance of a good floor pump.

But back to the original topic: If you can't push any more air into it, it's not the tire's fault. And once you gain the possession of an adequate pump, getting the right air pressure into it can pop the bead properly onto the rim, as long as you don't have some inner tube stuck under it.
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Old 03-13-09, 07:44 AM
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Originally Posted by Metzinger View Post
^If I lost 20 lbs of fat, I'd be quite dead.

But my main point was intended to be that no portable pump can provide anything near the performance of a good floor pump.
.
And you'd be wrong.

You can easily get 120-130psi out of the road morph. Granted it doesn't get you there as fast as a floor pump, but it's not like it takes ages either. The point is, his pump is not the problem. If the tire is going "all out of true", then it's not seating correctly, or it's about to come off the rim. Last option I can think of is defective tyre. None of these options have anything to with not getting more than 70psi into the tube. With the road morph as the pressure gets high, you must push down all the way to the end of the stroke. It's the very last inch or two of travel that is actually doing anything.

Last edited by operator; 03-13-09 at 07:47 AM.
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Old 03-13-09, 07:50 AM
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^You mean wrong and dead?

Dude, he didn't say which pump he was using. The road morph is just somebody else's pet pump they felt compelled to add to the thread.
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Old 03-13-09, 07:57 AM
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^ and that would have been the only time it was mentioned if some schelp hadn't felt compelled to complain about its weight while not even understanding that it IS a workable frame/mini pump.

Back to the OP, Retro Grouch hit the nail on the head, nothing else really needed to be added.
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Old 03-13-09, 07:59 AM
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Originally Posted by Metzinger View Post
Provided you don't care about weight.

On the other hand, you can use a workable frame or mini pump while riding. And a real floor pump at home.
If I were limited to owning only one pump it would be a Road Morph. Since I'm not, I don't have one and have no desire to buy one. If you scan the posts, however, there must be 1,000 threads on what pump to carry. Road Morph has to be the top vote getter. That clearly makes it the preferred pump to carry on your bike.
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Old 03-13-09, 08:05 AM
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^(chuckle) Sorry for being such a 'schelp', but all the Grouch said was to look for a pinched tube and to buy a RoadMorph. I agreed with the former bit of advice but refuse to accept the latter as the absolute best way to get a tire up to pressure. Real floor pumps are cheap and good.
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Old 03-13-09, 08:07 AM
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Originally Posted by Metzinger View Post
^(chuckle) Sorry for being such a 'schelp', but all the Grouch said was to look for a pinched tube and to buy a RoadMorph. I agreed with the former bit of advice but refuse to accept the latter as the absolute best way to get a tire up to pressure. Real floor pumps are cheap and good.
Nobody is disputing the value of a floor pump, or your right to be a schlep.
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Old 03-13-09, 10:04 AM
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Originally Posted by Retro Grouch View Post
1. You can't be too careful when installing your inner tube. Inflate it just enough to give it some shape before stuffing it into the tire. Be VERY careful not to catch the tube under the tire bead. That's my guess what's causing your tire to both look wobbly and flatten easily. After installing both beads of your tire onto the rim, push the valve stem in toward the hub to be sure the thicker part of the tube isn't holding the tire bead out.

2. What are you using to inflate your tire? All mini pumps (I have to use a technical term here) SUCK. It's only a matter of how badly. The preferred pump for carrying on your bike is a Topeak Road Morph.
I'm using a regular floor pump. I went back and checked like 10 times that everything was in its place... the tube definitely wasn't caught anywhere which is strange because I still can't figure out what's going on.

I kinda tweaked the tire into place enough now where there's only one problem region: near the pista valve, on the tire. The tire kinda bumps up a bit there, but I checked a million times over for any tube catches and did push the valve stem in as suggested. Still nothing changed. So confused.

It's nothing drastically severe. Just enough to make me upset that it isn't perfect. Should I try riding on it to see if it will work itself in?
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Old 03-13-09, 10:54 AM
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Originally Posted by MrBearSir View Post
I'm using a regular floor pump. I went back and checked like 10 times that everything was in its place... the tube definitely wasn't caught anywhere which is strange because I still can't figure out what's going on.

I kinda tweaked the tire into place enough now where there's only one problem region: near the pista valve, on the tire. The tire kinda bumps up a bit there, but I checked a million times over for any tube catches and did push the valve stem in as suggested. Still nothing changed. So confused.

It's nothing drastically severe. Just enough to make me upset that it isn't perfect. Should I try riding on it to see if it will work itself in?
Make sure you press the presta valve down into the rim (away from the hub) as you put the remaining side of the tire bead back onto the rim. The tube, at the presta valve, is what is preventing the bead from seating.

Start reseating your tire at the valve, pressing the valve down into the rim so it is out of the way of the tire bead, then working your way around on both sides from there to the opposite side of the rim.

Here is a video that might be helpful
http://www.wonderhowto.com/how-to/vi...e-tire-261303/
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Last edited by chipcom; 03-13-09 at 11:27 AM.
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Old 03-13-09, 11:50 AM
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[QUOTE=MrBearSir;8522374]did push the valve stem in as suggested./QUOTE]

Did you push in the presta valve with the tire uninflated?

If you examine an inner tube you will find the rubber is thicker where the valve is attached. It's important not to let that extra thickness get between the tire bead and the rim's bead seat. If you do, that part of the tire will stick up just a skosh as you reported.
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Old 03-13-09, 10:08 PM
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+1 on Chip and Retro.

Do Not pull the valve all the way through the rim before the tire is fully seated. I covered the bases a couple days ago in this thread:
http://www.bikeforums.net/showthread.php?t=518039
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Old 03-13-09, 11:09 PM
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Originally Posted by MrBearSir View Post
I'm using a regular floor pump. I went back and checked like 10 times that everything was in its place... the tube definitely wasn't caught anywhere which is strange because I still can't figure out what's going on.

I kinda tweaked the tire into place enough now where there's only one problem region: near the pista valve, on the tire. The tire kinda bumps up a bit there, but I checked a million times over for any tube catches and did push the valve stem in as suggested. Still nothing changed. So confused.

It's nothing drastically severe. Just enough to make me upset that it isn't perfect. Should I try riding on it to see if it will work itself in?
No, don't ride on it because 60-70psi is definitely not enough pressure for that size tyre.

Here's the thing, when you inspect the tyre and push the valve in, you did with with ALL THE AIR OUT right? When pushing the valve-stem into the tyre, you want to push it ALL THE WAY IN so that it touches the tyre under the tread. That's about 20-25mm and only the tiny screw part should be sticking out. Then screw in the stem-nut about 10mm so that you can fit the pump head on; but most of the stem should be inside the tyre. That's the only way you can ensure that the tube isn't pinched between the tyre and rim.. actually let's back up...

To properly inspect the tyre, let out ALL THE AIR after you've mounted it. Then pull the tyre sideways about 20mm so that you can see into the gap between the tyre and rim-edge. No tube should be showing. Then move over about 6-8" and pull the tyre sideways again and inspect. Work your way all around the tyre and make sure there's no tube showing anywhere. THEN... do the same on the other side of the tyre. Only when you've inspected the entire circumference on both side and are sure that no tube is showing anywhere, then and only then start pumping it up.
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