Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Trouble Inflating Tires with Slime tubes

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Trouble Inflating Tires with Slime tubes

Old 09-26-11, 02:28 PM
Thread Starter
Join Date: Sep 2011
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Trouble Inflating Tires with Slime tubes

Hi all -

I commute by bike to work most days of the week and got a flat a few weeks ago. I replaced the tires with Slime Tubes but for some reason I can never get adequate pressure on the tires. No matter how much air I put in there, they always seem to sag when ridden. There's obviously no leak since the slime stops leaks, and the pressure never seems to change after I've inflated it...it just never gets to a maximum level when I keep inflating it with are (using a hand pump). I do hear a click in the cap of the pump whenever I'm inflating it and it's near maximum pressure.

Never seemed to have this problem using regular tubes. Anything I'm doing wrong?
elsongs is offline  
Old 09-26-11, 02:56 PM
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,964

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 124 Post(s)
Tagged: 1 Thread(s)
Quoted: 4362 Post(s)
Likes: 0
Liked 27 Times in 26 Posts
The only thing I can think of is that the Slime might somehow be affecting the valve causing the hose pressure which the pump reads to be higher than the tire pressure. I've seen this happen with Presta valves which can get stuck closed and need tremendous pressure, or manually opening (burping) so they'll open to admit incoming air.

With Shrader valves the pin on the thumblock is supposed to keep the valve open. Is it possible you're not pusing the pump head on far enough, or that maybe at half pressure is slips back a bit letting the valve close?
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 09-26-11, 03:08 PM
Senior Member
CACycling's Avatar
Join Date: Feb 2008
Location: Oxnard, CA
Posts: 4,565

Bikes: '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked 5 Times in 4 Posts
What is the max on the tires and what does the gauge say the pressure is at when you can't get any more air in?
CACycling is offline  
Old 09-26-11, 10:15 PM
Thread Starter
Join Date: Sep 2011
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks all. My hand pump doesn't have a gauge. But I stopped by the local bike shop after work and got a Presta adaptor and then inflated my tires with an air compressor. I was able to get a MUCH better tire pressure now.
elsongs is offline  
Old 09-26-11, 11:09 PM
Subjectively Insane
MilitantPotato's Avatar
Join Date: Jul 2008
Location: Saint Louis, Missouri
Posts: 802

Bikes: '09 Rodriguez Adventurer Custom, '08 Trek 7.3Fx

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Don't over inflate your tires. They tend to fail explosively if over-inflated. A little over max recommended is usually OK, but it's your well-being, and decision to push it. Also, rims can have a lower maximum recommended tire pressure than the tires. Might be worth looking into if you've put narrower tires on than the bike came with.

Though rarely is the maximum pressure a tire can hold the appropriate tire pressure for your use, unless you're heavy on narrow tires.
MilitantPotato is offline  
Old 09-27-11, 09:03 AM
Senior Member
Join Date: Jul 2006
Location: Middle of the road, NJ
Posts: 3,084
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 269 Post(s)
Liked 61 Times in 39 Posts
"Anything I'm doing wrong?" Using the Slime tubes for one. They are heavy, and have an anoying habit which you have discovered. The valve will clog from the inside, because it acts like a leak. You have to take the valve core out, and (try) to clean the inside of the valve stem with a q-tip and water. You may have to replace the valve core, as it too will be fouled with dried or semi dried Slime. I tried a slime tube once, it didn't last the summer because I got so f'n sick and tired of cleaning the valve every time I wanted to add air.
Unless you get a lot of flats, get some regular tubes.
leob1 is offline  
Old 09-27-11, 09:14 AM
cowboy, steel horse, etc
LesterOfPuppets's Avatar
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 36,347

Bikes: everywhere

Mentioned: 60 Post(s)
Tagged: 1 Thread(s)
Quoted: 6843 Post(s)
Liked 2,337 Times in 1,232 Posts
If you air up every other day or so the valve is more likely to stay loose. Also air up in the morning after making sure the valves aren't at the bottom of the wheels swimming in slime when you park the night before.

There are a couple of tricks to using slime but it's really no problem once you get used to it.

I noticed you're running presta valves. Just make sure you burp the valve before connecting pump head. Just give it a little tap and listen for a sssst.

Last edited by LesterOfPuppets; 09-27-11 at 09:18 AM.
LesterOfPuppets is offline  
Related Topics
Thread Starter
Last Post
Bicycle Mechanics
04-24-18 09:45 AM
Bicycle Mechanics
08-21-16 07:19 PM
Bicycle Mechanics
08-23-14 05:57 PM
Road Cycling
06-24-14 03:24 PM
Still Pedaling
Folding Bikes
11-29-13 07:28 AM

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

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.