P235/70 R15 - Ford Explorer Ranger Enthusiasts "Serious Explorations"®

GTExplorerMan · 05-23-2001, 10:39 PM

Right now I run on Michelin P235/70 R15s........I want to get some 31's in the future. What I want to know is, how can I tell how big my tire is right now? Am I running on a 29 or 30 right now? The help is greatly appreciated.

Thanks

GRNMACHINE · 05-23-2001, 10:47 PM

235/70/15 is listed as a 28" tire thru the metric conversion on www.4lo.com. going with a 31x10.50x15 will change your speedo some but should fit fine and look great.

GTExplorerMan · 05-23-2001, 10:49 PM

What do you mean it will change my 'speedo'?

Thanks

Karman · 05-24-2001, 08:40 AM

Quote:

What do you mean it will change my 'speedo'?

When you change tire sizes to a size that has a larger or smaller diameter, it affects the reading of your speedometer. Smaller tires will spin faster, larger tires will spin slower. Your speedometer reads the rate at which the wheel turns. Your speedo could show you running either faster or slower than you actually are.

**Maniak** · 05-24-2001, 07:38 PM

If you go from a 235x75 r15 tire (around 28" tall) to a 31" tire (which is actually only 30.5" tall depending on the brand) you will be increasing the tire size by about 9%.. That means your speedo will read about 9% high..

~Mark

GTExplorerMan · 05-24-2001, 10:04 PM

So does this mean that if my speedo says I am going 50 M.P.H., I am really only going like 45. Or is it the other way around?

Thanks

**Maniak** · 05-25-2001, 11:15 AM

What Gimp said.. I don't know why I said it would read 9% high.. I should have said 9% low.. must have been late in the day..

~Mark

05-23-2001, 10:39 PM	#1
GTExplorerMan Wannabe Elite Explorer Alpharetta, Ga '00 XLT Join Date: Apr 2001 Posts: 20 Vehicle Specs	P235/70 R15 Right now I run on Michelin P235/70 R15s........I want to get some 31's in the future. What I want to know is, how can I tell how big my tire is right now? Am I running on a 29 or 30 right now? The help is greatly appreciated. Thanks __________________ "If you aren't a just a little out of control, You aren't going fast enough"

05-23-2001, 10:47 PM	#2
GRNMACHINE Wannabe Elite Explorer IL 95 Sport 4x4 Join Date: Sep 2000 Posts: 502 Vehicle Specs	235/70/15 is listed as a 28" tire thru the metric conversion on www.4lo.com. going with a 31x10.50x15 will change your speedo some but should fit fine and look great. __________________ 95 Sport 4x4, 3.73, torsion twist/shackles, K&N FIPK, 33X12.50X15 BFG T/A, 15X8.5 Centerlines, Pro Comp ES9000 shocks, Flowmaster Force II, ARB OME Leaf Springs, 2" BODYLIFT BY MATT GRNMACHINE

05-23-2001, 10:49 PM	#3
GTExplorerMan Wannabe Elite Explorer Alpharetta, Ga '00 XLT Join Date: Apr 2001 Posts: 20 Vehicle Specs	What do you mean it will change my 'speedo'? Thanks __________________ "If you aren't a just a little out of control, You aren't going fast enough"

05-24-2001, 07:38 PM	#5
Maniak Moderator-Stock 91-94 Vail, Arizona 1992 XLT 4x4 Join Date: Feb 1999 Posts: 6,473 Vehicle Specs	If you go from a 235x75 r15 tire (around 28" tall) to a 31" tire (which is actually only 30.5" tall depending on the brand) you will be increasing the tire size by about 9%.. That means your speedo will read about 9% high.. ~Mark __________________ Click HERE to see our Explorer Specs Get your Serious Explorations Explorer4x4, Explorerforum and ExplorerSportruck T-shirt

05-24-2001, 10:04 PM	#6
GTExplorerMan Wannabe Elite Explorer Alpharetta, Ga '00 XLT Join Date: Apr 2001 Posts: 20 Vehicle Specs	So does this mean that if my speedo says I am going 50 M.P.H., I am really only going like 45. Or is it the other way around? Thanks __________________ "If you aren't a just a little out of control, You aren't going fast enough"

05-25-2001, 11:15 AM	#7
Maniak Moderator-Stock 91-94 Vail, Arizona 1992 XLT 4x4 Join Date: Feb 1999 Posts: 6,473 Vehicle Specs	What Gimp said.. I don't know why I said it would read 9% high.. I should have said 9% low.. must have been late in the day.. ~Mark __________________ Click HERE to see our Explorer Specs Get your Serious Explorations Explorer4x4, Explorerforum and ExplorerSportruck T-shirt