Tire size...vs...Speedo change

Messenger · 11-03-2009, 08:58 PM

OK , as I look at putting bigger tires on my truck I keep wondering about the change that differant sizes will have on the speedometer, right know I have 265/70/17 (stock)would like to get up to 315's on stock wheels . any help would be great.

Thanks

__________________
2006 2500 4x4 Quad cab , Clifford remote starter

***beefster*** · 11-05-2009, 03:41 AM

you can play with these calculators:
Calulators from www.4Lo.com

265/70/17= 31.606299212598426" diameter
315/70/17= 34.36220472440945" diameter

so at 65mph corrected speed is 70.7 mph

im not sure how accurate this is, but its sounds about right.

__________________
98.5 3500 QCLB 4x4 SRW - 2" HBS Level- Guages- GDP Fuel Boss- BDBB 180hp Injectors- Built trans with billet internals- AFE Magnum- 4" turbo back- Banks Hi-Ram- Banks Exhaust brake...

Messenger · 11-05-2009, 12:01 PM

Thanks for the info

__________________
2006 2500 4x4 Quad cab , Clifford remote starter

Wstep005 · 11-05-2009, 10:35 PM

i had 315's on stock rims and at 50 it was actually 54, 60 was 65 and 70 was between 75 and 76. now i have 305's with 18's and it is only off by 1 at all speeds.

__________________
'06 2500 Mega Cab, Silencer Ring MIA, Banks Ram Air w/ Scoop, 8 inch Silverline Stack, Go fast parts on the way

Haywood_U · 11-06-2009, 01:06 PM

Good site for calculating this:

DML Tire and Wheel Calculator

I printed out the chart and keep it with me in case I forget.

__________________
2001 Ram 2500, Quad cab SB, 4x4.

11-03-2009, 08:58 PM	#1 (permalink)
Messenger Newbie Join Date: Jul 2009 Location: Nebraska Posts: 27 Thanks: 0 Thanked 1 Time in 1 Post Messenger's Truck Pics	Tire size...vs...Speedo change OK , as I look at putting bigger tires on my truck I keep wondering about the change that differant sizes will have on the speedometer, right know I have 265/70/17 (stock)would like to get up to 315's on stock wheels . any help would be great. Thanks __________________ 2006 2500 4x4 Quad cab , Clifford remote starter

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11-05-2009, 03:41 AM	#2 (permalink)
*beefster* Resident HopHead Join Date: Dec 2007 Location: South Orange County, CA Posts: 54 Thanks: 11 Thanked 2 Times in 2 Posts beefster's Truck Pics	you can play with these calculators: Calulators from www.4Lo.com 265/70/17= 31.606299212598426" diameter 315/70/17= 34.36220472440945" diameter so at 65mph corrected speed is 70.7 mph im not sure how accurate this is, but its sounds about right. __________________ 98.5 3500 QCLB 4x4 SRW - 2" HBS Level- Guages- GDP Fuel Boss- BDBB 180hp Injectors- Built trans with billet internals- AFE Magnum- 4" turbo back- Banks Hi-Ram- Banks Exhaust brake...

11-05-2009, 12:01 PM	#3 (permalink)
Messenger Newbie Join Date: Jul 2009 Location: Nebraska Posts: 27 Thanks: 0 Thanked 1 Time in 1 Post Messenger's Truck Pics	Thanks for the info __________________ 2006 2500 4x4 Quad cab , Clifford remote starter

11-05-2009, 10:35 PM	#4 (permalink)
Wstep005 Newbie Join Date: Jun 2009 Location: Chesapeake, VA Posts: 23 Thanks: 7 Thanked 0 Times in 0 Posts Wstep005's Truck Pics	i had 315's on stock rims and at 50 it was actually 54, 60 was 65 and 70 was between 75 and 76. now i have 305's with 18's and it is only off by 1 at all speeds. __________________ '06 2500 Mega Cab, Silencer Ring MIA, Banks Ram Air w/ Scoop, 8 inch Silverline Stack, Go fast parts on the way

11-06-2009, 01:06 PM	#5 (permalink)
Haywood_U Cummins Fanatic Join Date: Feb 2008 Posts: 117 Thanks: 0 Thanked 0 Times in 0 Posts Haywood_U's Truck Pics	Good site for calculating this: DML Tire and Wheel Calculator I printed out the chart and keep it with me in case I forget. __________________ 2001 Ram 2500, Quad cab SB, 4x4.