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Should my tires be flattening out?(5 posts)

Should my tires be flattening out?94Nole
Aug 12, 2002 1:20 PM
Okay, I know I am opening myself up on this one but am wondering about tire pressure. I could buy a separate guage but thought the one on my floor pump (Topeak Joe Blow Sport) was sufficient until...

I was riding along Saturday AM in the daylight (I generally ride in early AM before sun up) and I looked down at my rear tire and it was flattening out more than I thought it should. Okay, I am overweight at 6' tall and 235#. The pump guage says that the tire is inflated to 120psi. Should the tire flatten out?

Thoughts?
you can't defeat physicsmr_spin
Aug 12, 2002 1:36 PM
Tires can hold their shape only up to a point. If you are admittedly overweight, it's not a surprise that your tires are straining. Put a ton of bricks in your car and see what happens.
probably rightDougSloan
Aug 12, 2002 1:47 PM
Sounds about right. The tires should feel pretty darn hard when squeezed with your thumb. At 235, you're going to flatten them out more than a 150 pounder, no doubt.

You might try 25 or 28 mm tires. Many of the 23's are really not 23 mm wide, so you may be riding on something that is really around 21-22. The wider tires will still flatten out, but they will be less likely to pinch flat and give a better ride.

Doug
How accurate are...TREKY
Aug 12, 2002 5:09 PM
the guages on the pumps?I have a Joe Blow Sport also and I have been wondering whether I'm really pumping to the correct pressure.Anybody have any experience with testing accuracy?
re: Should my tires be flattening out?JimP
Aug 13, 2002 5:02 AM
This is an old tire inflation graph that I got many years ago. The weight is for the total weight of the bike, rider, and anything else you can carry.