Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Tubeless issue and question

Notices
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

Tubeless issue and question

Old 12-03-17, 03:48 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Apr 2014
Location: Queens
Posts: 335

Bikes: Canyon Aeroad, Parlee ESX, Factor o2,Colnago CX Zero Disc,

Liked 2 Times in 2 Posts
Tubeless issue and question

Hi

I have been running Mavic Comete tubeless for the past few weeks...after a short tweaking of the PSI everything has been great with them.

Today I put some air into the rear then when i tried to put some air in the front sealant started spraying out of the valve.

i rolled the the tire to put the valve at the top and and tried to put air in again and same thing happened! i left the tire as it was and road with no issues

this never happened before filling the tire with air...any idea wtf is going on??
Billy1111 is offline  
Old 12-03-17, 04:13 PM
  #2  
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 23,208
Liked 10,647 Times in 6,055 Posts
It got into the valve. Happens occasionally. Did you set them up, or the shop?
Seattle Forrest is offline  
Old 12-03-17, 04:18 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Apr 2014
Location: Queens
Posts: 335

Bikes: Canyon Aeroad, Parlee ESX, Factor o2,Colnago CX Zero Disc,

Liked 2 Times in 2 Posts
Originally Posted by Seattle Forrest
It got into the valve. Happens occasionally. Did you set them up, or the shop?

I did!
Billy1111 is offline  
Old 12-03-17, 04:42 PM
  #4  
Thread Killer
 
Join Date: Aug 2008
Location: Ann Arbor, MI
Posts: 12,763

Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada

Liked 1,907 Times in 1,147 Posts
I take it you mean that you tapped the valve in preparation to attach the pump, and that's when it sprayed sealant? If so, yeah, as [MENTION=116887]seattle[/MENTION]_Forrest said, there was probably sealant in the valve stem.

To avoid this, clear sealant from the stem by giving the wheel a good spin before airing it up, or at least keep the valve somewhere in the lower half of the wheel, like betwee 4 and 8 o'clock, so that sealant drains out of the valve stem.
chaadster is offline  
Old 12-03-17, 05:00 PM
  #5  
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 23,208
Liked 10,647 Times in 6,055 Posts
Originally Posted by Billy1111
I did!
This has happened to me a few times but I had the shop set them up, so I took them back and they took care of it for me. I think you're going to have to pull the valve out, and I don't know if they can be cleaned or just replaced.
Seattle Forrest is offline  
Old 12-03-17, 05:58 PM
  #6  
S*v* J*sus
 
beanbag's Avatar
 
Join Date: Sep 2017
Location: Northern California
Posts: 83

Bikes: Fuji Gran Fondo

Liked 3 Times in 3 Posts
Originally Posted by chaadster
keep the valve somewhere in the lower half of the wheel, like betwee 4 and 8 o'clock, so that sealant drains out of the valve stem.
I agree with this
beanbag is offline  
Old 12-03-17, 07:18 PM
  #7  
Senior Member
Thread Starter
 
Join Date: Apr 2014
Location: Queens
Posts: 335

Bikes: Canyon Aeroad, Parlee ESX, Factor o2,Colnago CX Zero Disc,

Liked 2 Times in 2 Posts
thanx guys!
Billy1111 is offline  
Old 12-03-17, 08:13 PM
  #8  
Thread Killer
 
Join Date: Aug 2008
Location: Ann Arbor, MI
Posts: 12,763

Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada

Liked 1,907 Times in 1,147 Posts
Originally Posted by Seattle Forrest
This has happened to me a few times but I had the shop set them up, so I took them back and they took care of it for me. I think you're going to have to pull the valve out, and I don't know if they can be cleaned or just replaced.
I'd just try pumping it up normally; if it sticks and doesn't close, well, then you fix it. If that's the case, just unscrew the core and rub off any sealant on the o-ring at the bottom. The stem pin should toggle up and down freely. It's a very simply device, so I can't imagine what kind of problem could be had, but if the pin isn't free, or pumping is difficult, I suppose there could be solid sealant in the core, in which case I'd just rinse it with hot water, dry, and reinstall.
chaadster is offline  
Old 12-03-17, 10:01 PM
  #9  
Senior Member
 
Join Date: Feb 2011
Location: Minnesota
Posts: 4,673

Bikes: N+1=5

Liked 246 Times in 182 Posts
Originally Posted by chaadster
I'd just try pumping it up normally; if it sticks and doesn't close, well, then you fix it. If that's the case, just unscrew the core and rub off any sealant on the o-ring at the bottom. The stem pin should toggle up and down freely. It's a very simply device, so I can't imagine what kind of problem could be had, but if the pin isn't free, or pumping is difficult, I suppose there could be solid sealant in the core, in which case I'd just rinse it with hot water, dry, and reinstall.
^^ this. Learn how to do this.

I've been running sealant in tubeless tires (tubular mostly) for about 10 years now. Very useful to make sure you have a tool to remove cores so you can clean them like this. Also, you can buy valve cores pretty cheaply ($5 for 10 or so) and it pays to have some on hand. At some point, they do get hard to clean out.

But here's the head slapping simple stupid trick I learned this year. When you put your bike away for any length of time, make sure the valves are at the BOTTOM of the wheel (or on the down side of the wheel depending on how you store your bike). Doing this allows the any sealant that may have pooled in the stem to drain out and stay out of the valve. Doing this, you'll have a lot less problems. Sure worked for me and it irritates me I didn't think of it because it's that simple.

Another thing worth looking at are the MilkIt stems. This is kind of interesting because this stem allows you to actually remove the sealant from your tire, check it, see how much is in there etc... But more interestingly, it's got a little flap on the bottom of the stem that actually stops sealant from getting to the valve. Downside is that their valves are proprietary because they have a little piece that fits on the bottom of the valve that pushes the flapper open to allow air out. Regular presta stems will work but it's harder to let air out - not such a big deal for road tires but can be more of an issue for, say, fat bike tires. Either way, you won't get stranded and it pretty much ends the junk-in-the-valve problem.

J.
JohnJ80 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
BloomBikeShop
Bicycle Mechanics
25
04-13-18 04:13 PM
tedder987
Bicycle Mechanics
8
09-04-17 10:59 AM
GlennR
Cyclocross and Gravelbiking (Recreational)
9
03-13-17 05:13 PM
tdbalki
Bicycle Mechanics
7
09-28-15 12:29 PM
whitemax
Road Cycling
6
01-15-12 10:49 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.