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Trouble seating bead with tight tire. Bad rim tape? (tubeless)

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Trouble seating bead with tight tire. Bad rim tape? (tubeless)

Old 06-02-20, 08:58 PM
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jstluise
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Trouble seating bead with tight tire. Bad rim tape? (tubeless)

I picked up a set of Continental GP 5000 TL 700x25c for my HED Flanders C2+ rims (stock on '17 Diamondback Century 2). The rims came stock with rim tape so it was just a matter of installing a new stem to go tubeless. Previous tires clinchers.

I managed to get one tire on (the reviews are right - these are tight!). But my problem is getting the tires to seat. I'm using a compressor and removed the valve core to get max airflow. I also tried soapy water to lubricate the tire/rim contact. No luck.

The problem I'm seeing is that the rim tape that came on the wheels has deformed into the spoke holes, creating little divots. Because the tire is so tight, it is right in the middle of the rim and these divots give a nice path for air to escape around the entire rim. The tire is too tight for me to move it in any direction to prevent this from happening. See pictures:




Aside from trying to get more airflow from a larger/higher psi compressor (which I don't have), the only fix I see is to install new rim tape to eliminate these divots and leakage paths in hopes I can build enough pressure to set the bead.

Any other ideas before I go through the effort of removing this tire?

Thanks!
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Old 06-02-20, 09:02 PM
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For higher pressure road set ups we suggest double or triple layers of sealing tape. Also mount the tire with a tube to seat at least one bead. Then remove the tube, add sealant and reseat the second bead. Andy
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Old 06-02-20, 09:13 PM
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Originally Posted by Andrew R Stewart View Post
For higher pressure road set ups we suggest double or triple layers of sealing tape. Also mount the tire with a tube to seat at least one bead. Then remove the tube, add sealant and reseat the second bead. Andy
Thanks for the quick reply. That makes total sense. Any suggestion on a tape? I'll have to pick some up.

Thought about the tube method you suggested, but I don't think I would be able to get the tubeless stem installed with one bead set. Just not enough clearance and these tires are super tight.
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Old 06-02-20, 09:17 PM
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Welcome to the world of tubeless tires For wider large volume tires used of rocky/rough trails I can see the appeal. On narrower rimmed higher pressure tires run on pavement I just don't see it. We've used a varriaty of sealing tape with good results so no specific brand suggestion. Andy
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Old 06-02-20, 09:18 PM
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The super thin DT Swiss tape that is wrapped on 3-4 layers seems to be a favorite among my customers.

That's what I tend to see when I do rebuilds for them.

=8-)
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Old 06-02-20, 09:26 PM
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Originally Posted by Andrew R Stewart View Post
Welcome to the world of tubeless tires For wider large volume tires used of rocky/rough trails I can see the appeal. On narrower rimmed higher pressure tires run on pavement I just don't see it. We've used a varriaty of sealing tape with good results so no specific brand suggestion. Andy
You may be right! I'm running tubeless on my mtb and it's great. First go at tubeless on my road bike...we'll see how it goes

Originally Posted by mrrabbit View Post
The super thin DT Swiss tape that is wrapped on 3-4 layers seems to be a favorite among my customers.
That's what I tend to see when I do rebuilds for them.
Thanks for the suggestion!
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Old 06-05-20, 11:39 AM
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New rim tape and I'm in business! The new tape eliminated the dimples where air was escaping and made seating the tire super easy. I ended up using WTB TCS tape because I could get a roll of it the quickest. Two wraps worked just fine.

Thanks all for the help!
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