I have always ridden a Mountain Bike and lately I've lived with a strange question related to the tire I've been using. I use a pair of 26 x 1.95 CST Rush tires that are a great cost-benefit and found easily in my country for $20 or less.

However, after a few minutes of riding on the road, it feels like the rear tire is being emptied. A few minutes after, this feeling passes and the trip remains normal, with great performance on the road and no complaints about the performance of the tire. This is normal behavior?

  • Do you notice a difference going the other way - starting on the road and then going off-road?
    – cmannett85
    Nov 28, 2012 at 11:48
  • Generally i make every trip on a same terrain type, but this problem occurs in both road or land track Nov 28, 2012 at 11:55
  • 1
    Can you elaborate? When you say it feels like the tire is being emptied, is there a noise or does it just feel slow? etc. Nov 28, 2012 at 22:00

1 Answer 1


I'm not sure if I follow you exactly, but I ride road and dirt. More to it, I ride my mountain bike on the road on the way to the dirt. Here's my $0.02.

The tires on my mountain bike are inflated to about 32-35 PSI (2.2-2.4 bars), and they have a lot of rolling resistance on asphalt. The sensation of riding on them is entirely different than my road bike tires, which are typically inflated to 105-110 psi (7.2-7.6 bars). The mountain bike tires feel like they are flat, even when I know they are not. I find myself looking down at them, wondering if they are still holding air. In my defense, on the mountain bike, I use tubes filled with a sealant, so it is possible for a puncture-- a thorn, maybe, or a piece of wire from a car tire-- to cause a slow leak. When you pull the thorn or wire out, there is a little puff of air that escapes, but the sealant usually closes the leak almost immediately. But it is not foolproof, and I can't shake the feeling the tires feel flat, even if I just aired them up before riding.

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