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Fully seating bead before inflating road bike tire

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Fully seating bead before inflating road bike tire

Old 03-19-16, 06:31 PM
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mnsam
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Fully seating bead before inflating road bike tire

So new to road bikes and had a question regarding reseating the bead on tires after changing a tube. Whenever I change the tire I can usually get most of the bead seated but I always have a bit of the bead that refuses to seat. Once I inflate to 80 PSI or so, the I hear a popping sound and the bead seats, but wondering if it's a bad idea to finish seating the bead by inflating? Not sure if the bead is likely to jump off while doing this. Either by the time I reach 90 PSI it is all the way seated, but wondering if I am better off ensuring that it is fully seated before going past ~40 psi or so or if it is perfectly fine to do this as long as it's close to seated.

I attached a picture. In the picture there is a 5" section of bead that isn't totally seated on one side and refuses to seat till I reach 80 psi or so.

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Old 03-19-16, 06:42 PM
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The usual trick is to put 10 or 15 lbs of pressure in the tube - just enough to give it some shape. Then go around and wiggle the tire all the way around with your hand. This will prevent the tube from getting stuck under the bead and help seat the tire. You can let out the air and do it over a few times if you need to. When you are satisfied that the bead is set properly, fully inflate the tube.
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Old 03-19-16, 06:44 PM
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Originally Posted by mnsam View Post
So new to road bikes and had a question regarding reseating the bead on tires after changing a tube. Whenever I change the tire I can usually get most of the bead seated but I always have a bit of the bead that refuses to seat. Once I inflate to 80 PSI or so, the I hear a popping sound and the bead seats, but wondering if it's a bad idea to finish seating the bead by inflating? Not sure if the bead is likely to jump off while doing this. Either by the time I reach 90 PSI it is all the way seated, but wondering if I am better off ensuring that it is fully seated before going past ~40 psi or so or if it is perfectly fine to do this as long as it's close to seated.

I attached a picture. In the picture there is a 5" section of bead that isn't totally seated on one side and refuses to seat till I reach 80 psi or so.

Seems normal to me, particulalrly if you are using wider tubeless compatible rims.
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Old 03-19-16, 06:44 PM
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Is that a tubeless or tubeless compatible rim?
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Old 03-19-16, 06:46 PM
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As long as the tube is properly inside the tire/rim and the tire ends up well seated all is good. Sometimes the seating occurs early in the inflation, sometimes at the end and after prodding with hands/seating pliers. Andy.
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Old 03-19-16, 06:51 PM
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I don't think it's possible to seat a bead without inflating? (someone correct me if I'm wrong). 80 PSI seems a bit high to finally seat the tire. Looks like the tube may be pushing the sidewall against the bead, and will only seat once the pressure is high enough for the sidewall to slip out.

What helps whenever I get that dip as you depicted, is inflating to about 40 psi and "massaging" the tire laterally on the rim until it at least looks correct (think holding the tire and prying to the side opposite the unseated bead). Bouncing the wheel on the problem side has helped me as well.
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Old 03-19-16, 06:55 PM
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Yes it is tubeless comparable. First bike with tubeless ready wheels. Are tubeless ready wheels tougher to properly seat?
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Old 03-19-16, 06:59 PM
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Ya that's why, normal for that type of rim.
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Old 03-19-16, 07:01 PM
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It's normal on my wide tubeless ready rims. Yes, sometimes the last bed section pops in at about 75-80 psi.
After inflating, I always hold the quick release or axle and spin the tire. I check that the molded line in the tire is evenly above the edge of the rim.

My tubeless ready rims make a pretty loud pop noise as the bead seats. It's a lot different than the older rims which never made a noise.

It takes some thumb pressure to pop the bead loose when removing a tire, too. That can help to keep the tire on the rim if you get a flat.

Tire pressure

A wide rim usually has an increased air volume. My 25mm outside width rims with a 23c tire measure 26.5 mm wide, and a 25c measures 27.5 mm.

So with the 23c, I use 80 to 85 psi front, and 95 to 100 psi rear. I could probably reduce both wheels 5 psi more. On fast group rides that might hit potholes or debris, I'll add 5 psi to both, just to possibly avoid a pinch flat.

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Old 03-19-16, 07:04 PM
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Soapy water helps me to seat tire beads without quite so much pressure as I had to use before. I use an old sponge to hold some dish soap and water, squish it a few time to get some good bubbles going, and pass it between the bead and rim, around both sides of the wheel.

Just one of the countless useful tricks I owe to the fine folks of these forums.
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Old 03-19-16, 07:36 PM
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Originally Posted by mnsam View Post
Yes it is tubeless comparable. First bike with tubeless ready wheels. Are tubeless ready wheels tougher to properly seat?
Yep, mine do the same thing. A little disconcerting the first few times but you get used to it.
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Old 03-19-16, 08:33 PM
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Originally Posted by Salamandrine View Post
The usual trick is to put 10 or 15 lbs of pressure in the tube - just enough to give it some shape. Then go around and wiggle the tire all the way around with your hand. This will prevent the tube from getting stuck under the bead and help seat the tire. You can let out the air and do it over a few times if you need to. When you are satisfied that the bead is set properly, fully inflate the tube.
And using talc on the tube will make it less sticky and easier to slide into position as you inflate it.
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Old 03-20-16, 02:58 PM
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I was taught a long time ago to do the inflate/deflate 3 times to allow the tube to "walk" around the rim inside the tire and eliminate twists, wrinkles and be seated evenly throughout the tire, while also massaging the tire to eliminate sticking and uneven bead seating and blowoffs. Patience is key, as with many things. I have had very few problems over 45 years by following this.
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Old 03-20-16, 05:15 PM
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Basics: push the stem In.. (its reinforced rubber gets in the way).. go around the tire to maks sure no tube is under bead just between them .
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