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06-05-2012, 02:41 PM
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#1
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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TV tire sizes
What is the effect of changing the aspect ratio of a tire from 60 to 65.
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 02:46 PM
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#2
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Senior Member
Join Date: Feb 2012
Posts: 1,102
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The overall diameter of the tire will get bigger. The 60 and 65 are the height of the sidewall as a percentage of the tire width. A 100mm wide tire would have a 60 mm or 65 mm tall sidewall. 1010tire has a good tool that you can put different size tires in and compare them to each other.
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 Ontario
Current: 2019 Sunseeker 2290S
Previous (2012-2016): 2012 Vibe 6501
1 Prospector Canoe, 2 Mtn. Bikes & 4 Hiking Boots
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06-05-2012, 02:50 PM
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#3
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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I have 275 60 20 on the truck now but can get a great deal on 275 65 20. Any negative effects to go with the different size tire.
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 02:53 PM
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#4
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Junior Member
Join Date: Jun 2012
Location: Williamsburg, VA
Posts: 22
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Here is the math broken down:
For example you have a 285/70-17 tire.
285 * .7 = 199.5
199.5 / 25.4 (to convert to inches) = 7.85
7.85 * 2 (height of sidewall twice) = 15.7
15.7 + 17 (adding sidwalls to wheel size) = 32.7 (diameter of tire)
Hope this helps.
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"PT CREW MEMBER SINCE 01 JUNE 2012" 2012 AVENGER 26BH 2008 GMC SIERRA 1500 6.0
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06-05-2012, 02:57 PM
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#5
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Now that I understand the aspect ratio math, will this affect the truck in any way?
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 02:59 PM
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#6
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Senior Member
Join Date: Feb 2012
Posts: 1,102
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This will change the final drive of the truck 60 series = 630 revs per mile diameter 32.99 inch, and 65 =610 revs per mile diameter 34.07 inch. You are also over 3% bigger which is the maximum that is recomended (3.17%)
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Ontario
Current: 2019 Sunseeker 2290S
Previous (2012-2016): 2012 Vibe 6501
1 Prospector Canoe, 2 Mtn. Bikes & 4 Hiking Boots
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06-05-2012, 03:11 PM
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#7
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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So, I shouldn't do it?
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 03:16 PM
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#8
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Senior Member
Join Date: May 2012
Posts: 201
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It will make your speedometer out by 3%, no biggy.
And it will make your truck pull a wee bit harder with the camper, but again 3% should not be a deal-breaker.
On the positive side, you may get slightly better gas milage (non-towing)as your motor will be turning fewer revs.
You have the hemi, I assume?
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06-05-2012, 03:19 PM
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#9
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Quote:
Originally Posted by DonG
It will make your speedometer out by 3%, no biggy.
And it will make your truck pull a wee bit harder with the camper, but again 3% should not be a deal-breaker.
On the positive side, you may get slightly better gas milage (non-towing)as your motor will be turning fewer revs.
You have the hemi, I assume?
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I have the hemi. I am motivated by the good price on a set of Michelins.
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 03:21 PM
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#10
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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You won't notice the difference and I would bet the truck did not come with either the tires you have now or the ones you are contemplating. Look in the manual for the size that came on the truck originally.
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06-05-2012, 03:28 PM
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#11
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Quote:
Originally Posted by dunnnc
You won't notice the difference and I would bet the truck did not come with either the tires you have now or the ones you are contemplating. Look in the manual for the size that came on the truck originally.
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I purchased the truck new and haven't changed the tires yet. I'm pretty confident that are original. 
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 03:29 PM
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#12
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Missing Link
Join Date: Apr 2012
Location: Genesee, MI
Posts: 419
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And you can go to the tire manufacture's site and it will give you the overall dia of the tire your looking at. Because the sizes between different manufactures varies a little.
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2014 Puma 30-DBSS
2014 Ram 2500 Mega Cab 6.4L
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06-05-2012, 03:58 PM
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#13
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Brigitte
Join Date: Aug 2011
Location: Kingston
Posts: 725
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Are they LT tires? Interested in this thread, hard to find LT tires the original 20 inch size.
Let us know if you get them and the brand... Might get the same ones.
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2013 Jayco Eagle HT 23.5
2010 Ram 1500 HEMI with integrated brake controller, tow mirrors and Michelins LTX/AT2 275/65R20 max load: 3750 lbs. @ 80 psi but we keep them 50-55 psi
Superglide 2700
Timbrens
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06-05-2012, 04:01 PM
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#14
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Quote:
Originally Posted by boubou
Are they LT tires? Interested in this thread, hard to find LT tires the original 20 inch size.
Let us know if you get them and the brand... Might get the same ones.
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Michelin LTX AT2 - Private sale on Kijiji
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 04:04 PM
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#15
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Senior Member
Join Date: Apr 2011
Location: Coquitlam, BC
Posts: 165
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Check the load rating on the new tires.
A taller sidewall MAY be slightly softer, but tire construction varies.
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06-05-2012, 04:12 PM
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#16
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Senior Member
Join Date: Apr 2011
Location: Coquitlam, BC
Posts: 165
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Micheline LTX AT2 comes in P and LT versions. Obviously do not buy the "P" tire, only the LT tire
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06-05-2012, 04:19 PM
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#17
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Missing Link
Join Date: Apr 2012
Location: Genesee, MI
Posts: 419
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According to michelin the tire your looking at has a overall dia of 34.4. And another good thing is lt tires have a deeper tread depth than p-metric.
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2014 Puma 30-DBSS
2014 Ram 2500 Mega Cab 6.4L
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06-05-2012, 04:52 PM
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#18
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Doesn't the LTX designation signify LT rated tires?
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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06-05-2012, 04:58 PM
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#19
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Missing Link
Join Date: Apr 2012
Location: Genesee, MI
Posts: 419
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No. michelin always uses the ltx on all their light duty truck tires. Even on the p-metric. Just likes goodyear with wrangler or cooper with discoverer.
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2014 Puma 30-DBSS
2014 Ram 2500 Mega Cab 6.4L
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06-05-2012, 05:03 PM
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#20
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Senior Member
Join Date: Jan 2011
Posts: 2,106
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Quote:
Originally Posted by cyclepuck
No. michelin always uses the ltx on all their light duty truck tires. Even on the p-metric. Just likes goodyear with wrangler or cooper with discoverer.
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I should know this stuff. I live in a tire town. We have the Michelin light truck tire plant in my back yard. Employees get a tire discount, but us commoners get nothing off.
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Terry/Bernadette Lily the Yorkie 2019 Dodge Ram Sport 1500 2019 FR Vibe 28RL
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Linear Mode
