Notices
Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

Road bike tyre pressure

Old 01-22-10, 05:36 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Aug 2006
Location: Aus
Posts: 636
Likes: 0
Liked 0 Times in 0 Posts
Road bike tyre pressure

Hi everyone,

Seems I wrote a long and detailed post and it somehow didn't get posted, so here I go again. I've just had my first flat on my road bike, a slow leak. I am currently around 212lb and give the tubes maximam rated pressure, which is 120psi.

So I went to replace the tube whcih was easy enough. The trouble was when I pumped it up to 120 it blew out. I tried it again with another tube and got the same result and it felt like I might go deaf. The third tube I tried I only pumped it up to 100psi because I was getting a bit squeamish.

So, what is a good pressure to run road tyres at? Could I possibly just had some bad luck with tubes?

PS - There is a thread of tyre pressure in the sticky, but it concerns more MTB tyres and tubes.

Thanks
damnable is offline  
Old 01-22-10, 06:02 AM
  #2  
Galveston County Texas
 
10 Wheels's Avatar
 
Join Date: Nov 2007
Location: In The Wind
Posts: 33,302

Bikes: 02 GTO, 2011 Magnum

Liked 1,264 Times in 638 Posts
The tubes that blew out were pinched in between the tire and the rim.
Most of us have done that.
__________________
Fred "The Real Fred"

10 Wheels is offline  
Old 01-22-10, 07:40 AM
  #3  
Triathlon in my future???
 
flip18436572's Avatar
 
Join Date: Jun 2007
Location: Southwest Iowa
Posts: 2,193

Bikes: Junk, that is why I am here. :-)

Likes: 0
Liked 1 Time in 1 Post
I run mine at 120. I think you probably had the tube between the rim and the tire. I have run them at 130 and never had a tube blow out while pumping it up. Either that or you have a bad bunch of tubes.
__________________
2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun
flip18436572 is offline  
Old 01-22-10, 09:31 AM
  #4  
Senior Member
 
Join Date: Sep 2009
Location: San Marcos, CA
Posts: 557
Likes: 0
Liked 0 Times in 0 Posts
Like 10Wheels said, probably a pinch between the tube and the rim. What happens is the tube is not inside the tire correctly, part of it is pinched between the tire and the rim.

When you put the tube on, put a little bit of air in it so it has the basic tube shape it will have inside the tire. If it is too hard to mount, you put too much air in. Let a little out. After you get it mounted, put just a little more air in it and then squeeze the tire together and look between the bead of the tire and the rim and make sure you can't see any of the tube. I go all the way around the rim, checking to see if the tube is pinched anywhere. Then inflate.

I run my rear tire at 120, front at about 100 and I weigh more than you do. That is on 25's. You should be able to run 120, but you may not need to. What size tire are you running?
MrClyde is offline  
Old 01-22-10, 09:44 AM
  #5  
Senior Member
 
Join Date: Jul 2008
Posts: 618
Likes: 0
Liked 1 Time in 1 Post
hI,
Be sure tire didn't get damaged at the bead, I had a rather expensive tire that ripped the kevlar bead cord after a blow out and every time I aired it up to around 120, the tire would slip alittle at the bead and it would blow out at the rim..
Anoter trick is to inflate the tube alittle where it stays in tire and then mount one side of the the rim, this prevents the tube from being folded over as the bead is mounted. Try to only use your fingers when you set the bead thats why I use talc it help it slip on easier.,tire tools can cut tubes our pinch them when mounting.
Some people also use a little talc on the tube makes it slippery helps seat the bead., or windex so it will slide around in the tire as it inflates.
I usally only go up to 90 psi let all the air out of the tire completly and check for tube at our near the rim it should not be visable. Always inflate off the bike if you can that way the rim seats evenly. I saw all these idea's on the Bike repair forum by the late Sheldon Brown I try and read every time I can about mechanically problems and quick fixes..
Some of the Vittoria folding tires are rated to 150 PSI perfect for us clydes. They cost more but seem to wear very well, I bought mine on the Bike Island free shippin.
Doug
https://sheldonbrown.com/flats.html


tire I like and I weigh 230 I keep the front at 110 psi the rear at 135 psi they roll very fast seem almost fluid contact with the road.
TR3417: Vittoria Diamante Pro 700x23c Black

Last edited by djnzlab1; 01-22-10 at 10:08 AM.
djnzlab1 is offline  
Old 01-22-10, 11:25 AM
  #6  
Banned.
 
Mr. Beanz's Avatar
 
Join Date: Dec 2005
Location: Upland Ca
Posts: 19,895

Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem

Likes: 0
Liked 4 Times in 3 Posts
Originally Posted by MrClyde

When you put the tube on, put a little bit of air in it so it has the basic tube shape it will have inside the tire. If it is too hard to mount, you put too much air in. Let a little out. After you get it mounted, put just a little more air in it and then squeeze the tire together and look between the bead of the tire and the rim and make sure you can't see any of the tube. I go all the way around the rim, checking to see if the tube is pinched anywhere. Then inflate.
This!....I use enough air to make sure th tube has a chance to seat inside the tire. Then I use both thumbs on one side to push the tire aside looking for teh balck rubber of the tube taht may be pinched. This is very improtant. I've seen too many riders just install the tire and go with the same results you are having. DANGEROUS!

Another thing I do at this time, is push the valve stem up into the tire so that it pops into place. Seems to be one of the trouble spots so it's actually the first thing I do.

I've run 120 for 12 years while riding at weights of 220-245 lbs with no problems.

BTW, you can tell if a tire is not properly mounted by spinning it and watching the line of the tire bead as it spins. If it is not consistent, there's a problem, not seated properly.
Mr. Beanz is offline  
Old 01-22-10, 11:59 AM
  #7  
Banned.
 
Mr. Beanz's Avatar
 
Join Date: Dec 2005
Location: Upland Ca
Posts: 19,895

Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem

Likes: 0
Liked 4 Times in 3 Posts
Avoiding the pinched tube 101

Place air in tire, push sidewalls wit both thumbs to enure proper seating or tire bead onto rim. Also make sure rimstrip/tape hasn'tmoved to side exposing spokes and that the tube is not pinched.


Grab hol dof valve stem (pic 1) then push into rim (pic 2) to relieve any binding or pinched rubber surrounding teh valvestem



Final check
Spin wheel to verify that the tire bead is seated on the rim properly. Tire bead should be consistent. Notice the line of the bead I highlited. While tire is spinning, it should be uniform. If thre is a bump in the line, something is wrong which means the tire is not seated properly.
Mr. Beanz is offline  
Old 01-22-10, 12:12 PM
  #8  
Senior Member
 
Join Date: Nov 2008
Location: Cobourg Ontario Canada
Posts: 2,206

Bikes: ParleeZ5/Parlee Chebacco/Trek Farley/Cannondale Slice/Burley Tandem

Likes: 0
Liked 10 Times in 4 Posts
I agree with pinch flats and FWIW I ride 110 on front 120 on back.
youcoming is offline  
Old 01-23-10, 07:42 PM
  #9  
Senior Member
 
Join Date: Apr 2008
Posts: 5,428

Bikes: Cervelo RS, Specialized Stumpjumper FSR Pro, Schwinn Typhoon, Nashbar touring, custom steel MTB

Liked 2 Times in 2 Posts
This is a pretty good way to determine what tire pressure to run...
sstorkel is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
h2o_polo_boi
Road Cycling
33
09-22-14 08:55 PM
panzer123
Bicycle Mechanics
3
04-28-14 09:50 AM
chrisabn
Bicycle Mechanics
60
09-29-13 10:49 AM
MNBiker
Commuting
42
04-19-13 01:34 PM
rickyhmltn
Bicycle Mechanics
4
11-04-11 09:51 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.