Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Seating the bead.

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Old 09-17-09, 04:32 PM
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str8jakett
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Seating the bead.

This may sound rather noobish, but I need to know if I am installing a new tire right. I bought two Maxxis Detonators to replace the stock tires. The wheels are the entry level Alex DA22 that came with the Giant Defy 3. I've flatted before and swapped tubes, but these Detonators feel very loose on the rim. The first time around I mounted the tire (hands only), pumped it up to 20psi, pushed in on both sides of the tire all along the rim and once I felt it wasn't pinching the tube, inflated to 110psi. After removing the pump I went to check the pressure with a tire gage and the tire promptly blew off the rim at the stem and popped the tube. Second time around, the tire was bulging out near the stem as the bead just wasn't seating. I've played around with it and pumped it up a little at a time and it seems to be sitting better, but there still seems to be too much "looseness" around the stem area on one side of the tire. I have not gone above 30psi yet.

Also, the bead feels pretty flimsy, I assume because the tires are foldable?
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Old 09-17-09, 04:37 PM
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What size are the tires?
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Old 09-17-09, 04:38 PM
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700x23.
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Old 09-17-09, 04:42 PM
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Have you tried both tires?
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Old 09-17-09, 04:44 PM
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No actually, just the one so far.
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Old 09-17-09, 04:47 PM
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I have the same rims.
Worked 3-1/2 hours trying to install two new tires.
I had the opposite problem, Too Tight.
Ended up with 7 punctured tubes before I got them on.

Keep trying.
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Old 09-17-09, 04:52 PM
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That sucks. I suppose I will keep trying till I run out of tubes tonight.
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Old 09-17-09, 05:04 PM
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I haven't had any problems with my DA22's. I do make sure that the little nut on the stem is out almost all the way when I mount the tire. Once I get the tire on, I push the stem up into the tire to make sure the little stiff part of the stem where it mounts in the tube is above where the tire mounts on the rim. Then I pull it down and put some air in, tightening up the little nut when it is pumped up a little. I just installed some Michelin Lithions a week ago and had no problems. These are the 4th set of tires I have had and none of them caused any trouble in mounting.
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Old 09-17-09, 06:41 PM
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Keep the tire seated with your hand while you pump it up... sometimes the tube pushes the tire off the hook in the rim while being infated... once you get the psi high enough and the tire is seated around all the way it will hold as you pump it up to max.
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Old 09-18-09, 06:25 AM
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i had one of those maxxis tires on my steel roadie and experienced the exact same problem, i just kept working at it, inflating in about 30 psi incriments and assuring the bead was seated before moving on. i now have about 800 trouble free miles on that tire, so you should be good once you get it seated.
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Old 09-18-09, 06:43 AM
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Originally Posted by AngryScientist View Post
i had one of those maxxis tires on my steel roadie and experienced the exact same problem, i just kept working at it, inflating in about 30 psi incriments and assuring the bead was seated before moving on. i now have about 800 trouble free miles on that tire, so you should be good once you get it seated.
Good to hear. It almost looks as if it needs to be rolled on with some weight to even out the seat all the way around the rim. Parts of the line that goes around the tire near the bead are different distances away from the edge of the rim, if that makes sense.
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Old 09-18-09, 06:53 AM
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i used to get a bulge occasionally at the valve and it happened with michelin and vittorio tyres. now i never get the problem by following a routine when putting a tyre on. when i put one edge on, i go all the way around the whole wheel pulling the tyre so the edge is pulled tightly into the rim. when i put the other side in, i start at the valve and finish by going around and pulling on the tyre holding both edges so the whole tyre is pulled into the rim. Before i start pumping, i push the valve up and jiggle it a bit so the tube is definitely up inside the tyre and not trapped against the bead.
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Old 09-18-09, 09:41 AM
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Started back in on it this morning and took it slow. Happy with the results, looking forward to riding on them.



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Old 09-18-09, 10:36 AM
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Originally Posted by str8jakett View Post
Started back in on it this morning and took it slow. Happy with the results, looking forward to riding on them.



I got Detonators (23's) with the (used, albeit little used <500mi) Open Pro/Ultegra wheelset I bought at the beginning of this season. I've put about 2000mi on them so far, and I have to say they are great tires. Haven't flatted and the grip seems pretty good. Good choice, I'm enjoying mine. Plus, those look sooooo good on your bike.

I don't race, I use my bike for mostly long distance fast(ish) rides, but again, great tires.

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Old 09-18-09, 10:49 AM
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nice ride john
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Old 09-18-09, 10:58 AM
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I wouldn't ride tires that are a) called 'detonators' and b) that much trouble to bead correctly.
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Old 09-18-09, 11:20 AM
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Originally Posted by liquefied View Post
I wouldn't ride tires that are a) called 'detonators' and b) that much trouble to bead correctly.
Great name choice, I know. They actually went on quite easy this morning. I just needed some reassurance and a little knowledge since it was my first swap.

Nice bike John, nice to hear of your experience with the Detonators. Thanks!
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