Air leak from "tubeless-ready" rim
07-14-19, 01:08 AM
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Air leak from "tubeless-ready" rim
I just set up a pair of "tubeless-ready" rims (the Arc 30 from Raceface) with TR tires from Maxxis, rim tape, and Slime sealant. After seating the bead, all the air leaks out of two holes that are machined into the rim. What are these holes for and what can I do to stop the leak? This url has a video of whats going on: youtube.com/watch?v=E4CcQ_SeEZw
Last edited by snowman975; 07-14-19 at 01:13 AM. Reason: specify parts
07-14-19, 04:44 AM
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Check that your valve stem is tight. They need to be really tight to seal. If air is leaking into the rim cavity, it is almost always from the valve stem seal, unless you did a really bad job of taping.
07-14-19, 05:01 AM
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Im guessing you are referring to the small holes that are there to evacuate water from the rim. If air is escaping that way, Im betting your tape is not airtight.
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07-14-19, 05:59 AM
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Maybe stupid question but are you using tubeless tape of the proper width?
07-14-19, 08:31 AM
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Ok so the consensus seems to be that its a bad tape job. Ill get some tubeless specific tape and try again (and tighten the valves more). Thanks for the replies
07-15-19, 03:33 AM
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I just set up a pair of "tubeless-ready" rims (the Arc 30 from Raceface) with TR tires from Maxxis, rim tape, and Slime sealant. After seating the bead, all the air leaks out of two holes that are machined into the rim. What are these holes for and what can I do to stop the leak? This url has a video of whats going on: youtube.com/watch?v=E4CcQ_SeEZw
07-15-19, 12:49 PM
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What tape are you using now, if it isn't tubeless-specific?
07-15-19, 09:35 PM
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The old tape had been applied at a bike shop over a year ago. Yesterday I took that stuff off and applied Stan's tape, that did the trick. There was a slow leak that lasted for the first couple fills, but now it seems to have sealed and is holding pressure at 30 psi.
07-22-19, 01:54 AM
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30psi isn't enough for road tires, must be at least 80psi.
07-22-19, 08:15 AM
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The Excel sheet that you showing us is simply based on the experience of users and don't have any connection with the recommandations of the manufacturer like f.e. Hutchinson or Schwalbe which you can read they recommand at least 80psi for road tires in 25 and 28 mm of the largeur.!
07-22-19, 10:25 AM
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The link in your post to Enve isn't to a manufacturer of tires, they have only knowledge of rims and wheels. 
The real manufactures of tires you didn't link in your post, so I did it for all and you'll see the lowest pressure is 5 bar for 25 mm. Okay, you'll right it had to be 75psi.
A manufacturer that recommends that folks do not exceed 80 psi when running 25mm road tires don't know what's he's talking.
The real manufactures of tires you didn't link in your post, so I did it for all and you'll see the lowest pressure is 5 bar for 25 mm. Okay, you'll right it had to be 75psi.
A manufacturer that recommends that folks do not exceed 80 psi when running 25mm road tires don't know what's he's talking.
07-22-19, 12:35 PM
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Road tires don't need 80 psi -- source: literally thousands of people who ride less than that.
30 psi is probably too loo for most road tires but OP has MTB rims and Maxxis tires which leads to a high probability that OP is talking about MTB tires (Maxxis makes road tires but no one uses them.) 30 psi is plenty for lots of MTB and CX applications.
Finally -- are we all going to ignore the use of Slime? Get thee some Stans or Orange Seal, post haste!
30 psi is probably too loo for most road tires but OP has MTB rims and Maxxis tires which leads to a high probability that OP is talking about MTB tires (Maxxis makes road tires but no one uses them.) 30 psi is plenty for lots of MTB and CX applications.
Finally -- are we all going to ignore the use of Slime? Get thee some Stans or Orange Seal, post haste!
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