Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 36

Thread: tubeless valve leaking air

  1. #21
    Join Date
    Feb 2014
    Location
    Alexandria to NOMA
    Posts
    827
    Post Thanks / Like

    Default

    Quote Originally Posted by hozn View Post
    Which rims & tires are you using? I'm not a 'cross racer, but it seems surprising you've had so many problems. Lots of folks do run tubeless, right? (I know November thinks it's "ready": https://novemberbicycles.com/blogs/b...for-prime-time)

    But those are pretty low pressures for a 32/33mm tire, so maybe that just pushes the setup a little too far.

    I hear of people rolling tubs off their rims too, but probably not with the frequency you've experienced.
    Spec Axis 4.0 rims, 3 wraps of 3M blue packing tape, Spec 2Bliss Terra FR and Tracer RR, Stan's sealant. 155lb rider @ 25psi FR, 26-27psi RR.

  2. #22
    Join Date
    May 2014
    Posts
    901
    Post Thanks / Like

    Default

    Quote Originally Posted by hozn View Post
    I'm not a 'cross racer
    Yeah, but you really should be.

  3. Likes Harry Meatmotor, hozn liked this post
  4. #23
    hozn's Avatar
    hozn is online now I really need to log off the internet and go for a ride.
    Join Date
    Jun 2012
    Location
    Arlington
    Posts
    3,320
    Post Thanks / Like

    Default

    Quote Originally Posted by Harry Meatmotor View Post
    Spec Axis 4.0 rims, 3 wraps of 3M blue packing tape, Spec 2Bliss Terra FR and Tracer RR, Stan's sealant. 155lb rider @ 25psi FR, 26-27psi RR.
    Welp, no idea re: those rims, but the tires sounds legit! (Why so much tape? [more] burping with fewer layers?) In general, I like Specialized's 2bliss tires, but haven't run anything smaller than 38mm in years now.

    My money would be on the rims being the problem, but switching rims to e.g. Stans isn't such a simple option.

  5. #24
    Join Date
    Feb 2014
    Location
    Alexandria to NOMA
    Posts
    827
    Post Thanks / Like

    Default

    Quote Originally Posted by hozn View Post
    Welp, no idea re: those rims, but the tires sounds legit! (Why so much tape? [more] burping with fewer layers?) In general, I like Specialized's 2bliss tires, but haven't run anything smaller than 38mm in years now.

    My money would be on the rims being the problem, but switching rims to e.g. Stans isn't such a simple option.
    Problem is the rims are tubeless ready, with good hooks and a flat bead shelf. And with 3 wraps of the thinner tape (thinner than Stan's by something like .05mm), I figured I'd be good to run down to ~23psi. First race on the tubeless was Dirt Crit - 30psi out back - and I burped when the rear tire came off the ground over a small whoop @22-ish mph, and landed a bit sideways. I though it was a fluke, but the same thing happened at DCCX.

    Roughly half of the folks racing cross on the team who are running tubeless have had issues (like, race-ending, or at least taking them out of top-10 contention), and that's across different rims/tires. I gave it a whirl thinking the folks having issues were due to less than ideal setup/install. Just counting race fees from blown races due to tire mechanicals, the tubeless setup has cost me about $150. At least 3 people on the team have gone from tubeless to tubs in less than a season of racing on tubeless. The only setup that hasn't seen any issues is Spec 2Bliss tires on Stan's Grail. I don't think I'll ever be convinced to run Stan's rims (long story...) despite being en vogue among the dirt/gravel cognoscenti. So far rims in the "not that great" column are (and, yes, I know most of these aren't tubeless specific profiles): HED Belgium C2, Axis (Specialized) 2.0 & 4.0, Easton EA90, Velocity Aileron.

    I will say, tho, I'll probably be sticking with Spec Terra and Tracer. The traction is phenomenal, especially the Terra. Its pretty insane.

  6. #25
    hozn's Avatar
    hozn is online now I really need to log off the internet and go for a ride.
    Join Date
    Jun 2012
    Location
    Arlington
    Posts
    3,320
    Post Thanks / Like

    Default

    Ok, well Grails have been my benchmark rim, so perhaps that is why I am surprised to hear about people burping tires. Of course now I am using DT Swiss R460 rims which have been awesome, but at higher pressures for small tires or low pressure for 40mm tires.

    We'll see how they fare at Iron Cross this weekend.

  7. #26
    TwoWheelsDC's Avatar
    TwoWheelsDC is offline I really need to log off the internet and go for a ride.
    Join Date
    Feb 2012
    Location
    Capitol Hill
    Posts
    3,504
    Post Thanks / Like

    Default

    Quote Originally Posted by Harry Meatmotor View Post
    Problem is the rims are tubeless ready, with good hooks and a flat bead shelf. And with 3 wraps of the thinner tape (thinner than Stan's by something like .05mm), I figured I'd be good to run down to ~23psi.
    Genuine question...if the rims are tubeless ready, why the tape? Does the tape somehow allow you to run lower pressures?

  8. #27
    hozn's Avatar
    hozn is online now I really need to log off the internet and go for a ride.
    Join Date
    Jun 2012
    Location
    Arlington
    Posts
    3,320
    Post Thanks / Like

    Default

    Tubeless ready just means the shape of the rim is designed for tubeless (mounting, not burping, etc.). There are generally still holes for the spokes in rim bed.

    There are also UST rims (or other tubeless rims) that don't have holes in rim bed.

  9. #28
    TwoWheelsDC's Avatar
    TwoWheelsDC is offline I really need to log off the internet and go for a ride.
    Join Date
    Feb 2012
    Location
    Capitol Hill
    Posts
    3,504
    Post Thanks / Like

    Default

    Quote Originally Posted by hozn View Post
    Tubeless ready just means the shape of the rim is designed for tubeless (mounting, not burping, etc.). There are generally still holes for the spokes in rim bed.

    There are also UST rims (or other tubeless rims) that don't have holes in rim bed.
    Aha...I just assumed anything labeled "tubeless ready" would not have the holes. But now I know!

  10. #29
    Join Date
    Feb 2014
    Location
    Alexandria to NOMA
    Posts
    827
    Post Thanks / Like

    Default

    Quote Originally Posted by TwoWheelsDC View Post
    Aha...I just assumed anything labeled "tubeless ready" would not have the holes. But now I know!
    There are a handful of manufacturers making tubeless carbon rims where the rim bed isn't drilled for spoke holes, but the spoke bed is drilled for normal spoke nipples. To lace the wheels, you need to drop the spoke nipple into the rim through the valve stem hole, then finagle it into position. Just a tiny bit tedious. But no need for sealing tape.

  11. #30
    Join Date
    May 2014
    Posts
    901
    Post Thanks / Like

    Default

    The tubeless valves that came with my eThirteen wheels have a core remover built into the top cap.

    Name:  IMG_7064.jpg
Views: 31
Size:  96.2 KB

  12. Likes hozn liked this post
    ELITE mstone ELITED this post

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •