Go Back  Bike Forums > Bike Forums > Mountain Biking
Reload this Page >

Another Tire PSI Question - About The Effects Of Running Too Low Of Pressure.

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

Another Tire PSI Question - About The Effects Of Running Too Low Of Pressure.

Old 04-23-12, 04:58 PM
  #1  
3speed
Senior Member
Thread Starter
 
Join Date: Aug 2009
Location: Madison, WI
Posts: 3,311
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Liked 2 Times in 1 Post
Another Tire PSI Question - About The Effects Of Running Too Low Of Pressure.

I've read Many times about people running as low of PSI as possible for traction, etc. Today my PSI was low when I got out to the trails. I rode anyway since I had enough air to keep from pinching, but the tire seemed squishy side to side if I pushed on the fork or chain stay to the side. I ended up landing a jump a little off and my front tire washed out upon landing and I wiped out. A couple of times my front tire seemed to push out more than it should have in the turns. It was only my second time out this season, though, and I was riding harder than last time, so I'm not sure if it was that or because of the low PSI. When I checked my PSI back at home It was ~20. Will pressure that low give you more traction or is it so low that it may have been why my front tire seemed to have less traction than it should have?
3speed is offline  
Old 04-23-12, 05:10 PM
  #2  
dminor 
Moar cowbell
 
dminor's Avatar
 
Join Date: Oct 2004
Location: The 509
Posts: 12,480

Bikes: Bike list is not a resume. Nobody cares.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That depends on the tire itself. A 2-ply DH casing tire will benefit from low pressures like that. But the sidewalls on single-wall folding-bead tires run real low can buckle or deform, which negates your traction and compromises handling.
__________________

Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."
dminor is offline  
Old 04-23-12, 05:24 PM
  #3  
3speed
Senior Member
Thread Starter
 
Join Date: Aug 2009
Location: Madison, WI
Posts: 3,311
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Liked 2 Times in 1 Post
Awesome. Thanks. I'm running the "Race" version of WTB MotoRaptors, which I'm pretty certain fall into the second category.
3speed is offline  
Old 04-23-12, 05:27 PM
  #4  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,720

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 2967 Post(s)
Liked 60 Times in 52 Posts
judge pressure by performance. you didn't like the performance of the pressure you used today so go higher next time. soon you will know what works best for you. I did the same with studded snow tires while bike commuting through the winter. some days I liked max pressure, other days I let 2lbs out.
rumrunn6 is online now  
Old 04-23-12, 06:01 PM
  #5  
cryptid01
one less horse
 
cryptid01's Avatar
 
Join Date: Aug 2003
Location: East Jesus NY
Posts: 5,600

Bikes: are better than yours

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by dminor View Post
But the sidewalls on single-wall folding-bead tires run real low can buckle or deform, which negates your traction and compromises handling.
...and also makes you ruin your shorts when it rolls over during hard cornering.
cryptid01 is offline  
Old 04-23-12, 11:53 PM
  #6  
dminor 
Moar cowbell
 
dminor's Avatar
 
Join Date: Oct 2004
Location: The 509
Posts: 12,480

Bikes: Bike list is not a resume. Nobody cares.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by cryptid01 View Post
...and also makes you ruin your shorts when it rolls over during hard cornering.
Yeah and that too.
__________________

Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."
dminor is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
spectastic
Bicycle Mechanics
0
09-24-13 10:33 PM
superduper54
Singlespeed & Fixed Gear
8
07-03-09 01:48 PM
jeff williams
Mountain Biking
0
01-12-05 09:26 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


Thread Tools
Search this Thread

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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.