Tire rolling resistance - GreenHybrid

bwilson4web · #1 (**permalink**) 12-24-2007, 03:15 PM

Hi,

I picked up the following graphs from:

Gyenes, L. and Mitchell, C.G.B., "The Effect of Vehicle-Road Interaction on Fuel Consumption," Vehicle-Road Interaction, ASTM STP 1225, B.T. Kulakawski, Ed., American Society for Testing and Materials, Philadelphia, 1994, pp. 225-239.

Tire inflation lookup table:

kN/m**2 - psi
200 - 29
225 - 33
250 - 36
275 - 40
300 - 44
325 - 47
350 - 51
375 - 53

Speed lookup table:

km/h - miles per hour
80 - 50
90 - 56
100 - 62
110 - 68
120 - 75

Vehicle drag is a function of rolling resistance and drag times the velocity squared. However, tire rolling resistance is not a linear function with speed and these charts give a clue.

Bob Wilson

solecondad · #2 (**permalink**) 01-30-2008, 08:57 PM

Interesting graphs. I've thought that keeping my tire pressure at 40 psi was getting the most out of the inflation/mileage curve, but your first graph shows that rolling resistance is still dropping at 90 psi!

The second graph confirms my belief that speeds above 55mph should be avoided.

kerpal · #3 (**permalink**) 04-02-2008, 02:36 AM

Quote:

Originally Posted by bwilson4web

Hi,

I picked up the following graphs from:

Gyenes, L. and Mitchell, C.G.B., "The Effect of Vehicle-Road Interaction on Fuel Consumption," Vehicle-Road auto body part Interaction, ASTM STP 1225, B.T. Kulakawski, Ed., American Society for Testing and Materials, Philadelphia, 1994, pp. 225-239.

Tire inflation lookup table:

kN/m**2 - psi

200 - 29

225 - 33

250 - 36

275 - 40

300 - 44

325 - 47

350 - 51

375 - 53

Speed lookup table:

km/h - miles per hour

80 - 50

90 - 56

100 - 62

110 - 68

120 - 75

Vehicle drag is a function of rolling resistance and drag times the velocity squared. However, tire rolling resistance is not a linear function with speed and these charts give a clue.

Bob Wilson

Very interesting

coolshock1 · #4 (**permalink**) 04-02-2008, 06:41 AM

Here's a link to a site with a report on LRR tires. There a PDF with the article and some data.

http://www.treehugger.com/files/2005...olling_res.php