| View previous topic :: View next topic |
| Author |
Message |
Bandit102
Joined: 22 Nov 2006
Posts: 242
|
| Posted: Thu Dec 27, 2007 11:15 am Post subject: Tire sizes & rpm |
|
|
| Anyone know if I'd drop any significant amount of rpm if I changed from 24.5 low pros to 11R24.5 tires? Right now, I turn 1600 at highway speed out west and would like to drop that as much as possible. |
|
| Back to top |
|
allan5oh
Joined: 26 Aug 2005
Posts: 2137
Location: jackassville (winnipeg, mb)
|
| Posted: Thu Dec 27, 2007 12:13 pm Post subject: |
|
|
| probably about 60 rpms. |
|
| Back to top |
|
Bandit102
Joined: 22 Nov 2006
Posts: 242
|
| Posted: Thu Dec 27, 2007 1:29 pm Post subject: |
|
|
hmm. not as much as I thought. Thanks Allan.
The rolling resistance is higher on the taller rubber, right?
I guess 60 rpm wouldn't make any notable difference in the fuel mileage anyway. |
|
| Back to top |
|
beeiatch
Joined: 30 Oct 2007
Posts: 26
|
| Posted: Fri Dec 28, 2007 8:46 am Post subject: Re: Tire sizes & rpm |
|
|
Bandit102 wrote: Anyone know if I'd drop any significant amount of rpm if I changed from 24.5 low pros to 11R24.5 tires? Right now, I turn 1600 at highway speed out west and would like to drop that as much as possible.
Go to Bridgestones website www.trucktires.com , it has a Q&A section that will help you with any question you might have. It is in "Ask the Tire Doctor" questions answered section. |
|
| Back to top |
|
Bandit102
Joined: 22 Nov 2006
Posts: 242
|
| Posted: Fri Dec 28, 2007 9:39 pm Post subject: |
|
|
| Thanks, Bee. |
|
| Back to top |
|
tracer
Joined: 17 Mar 2007
Posts: 194
Location: Cambridge, Ontario
|
| Posted: Tue Jan 08, 2008 9:51 pm Post subject: |
|
|
you should look at the revs per mile of the new tire. the formula is; revs per mile times axle ratio times top gear ratio equals engine RPM at 60 mph. for example,
495 revs per mile X 3.73 X 0.73 = 1347 rpm
another useful formula is:
new tire diameter divided by old tire diameter is how much your RPM will change.
example: your current tire is 42 in; you switch to 40.7 in
42/40.7 = 1.0319; so your RPM at a given speed will increase by 1.0319 |
|
| Back to top |
|
| |
Powered by phpBB 2.0.22 © 2001,2002 phpBB Group
|
|
Trucking
Companies | Trucking
Job Search | Online
Job Application | Trucking
Links | Truck Drivers
Message Board | Forum
Archives | Contact
Us | Site Map
Truck Driving Jobs
© 2003 ClassADrivers.com
Web Design
By CAD Website Design
| CAD Enterprises LLC |
