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How much difference does tire pressure make?(5 posts)

How much difference does tire pressure make?JimL
Oct 5, 2001 11:30 AM
I was thinking about putting slicks on my Mountain Bike because some road rides I'd like to do are interspersed with long stretches of bumpy gravel road.
I currently have 65psi max semi-slicks on my bike and have found a Continental tire with max 80 psi that will fit the mtn bike rims.
My question is whether 15 pounds of pressure would make much difference in performance on the road. If not, does anyone know of any tire which will fit on mtn bike rims that carry a higher pressure?
hugeishmael
Oct 5, 2001 11:43 AM
atleast on my road bike... if i go just over the max pressure as apposed to 15 under its very noticable..hard is good...
"huge"..."hard is good"...thats what she said...nmdoimakeyouhorny
Oct 6, 2001 5:47 PM
re: How much difference does tire pressure make?StmbtDave
Oct 5, 2001 12:23 PM
Tire width and pressure are directly related to rolling resistance. If you are looking for a higher pressure tire than the Conti's, try Ritchey Tom Slicks. They come in either 1.0" or 1.4" and run 100 lbs pressure. They will make your mtn bike almost ride like a road bike.
Acutally,Kerry Irons
Oct 6, 2001 5:06 PM
Casing deflection (and the associated energy it takes to deflect the casing) is directly related to rolling resistance. For a given tire construction (same casing and tread pattern), the combination of size and pressure that results in the least tire deflection will tend to give you the lowest rolling resistance. This is why a 23mm tire is lower rolling resistance than a 20 if they are both inflated to the same pressure - the 23 has to deflect less to create the same size contact patch as the 20. The contact patch is strictly a function of rider+bike weight divided by tire pressure.