Oil changes

[Vangruver]

I just swapped over from 155.80.13 winters on OEM vw alloys to 205.50.15 performance summers on OEM corrado steelies.

HUGE difference in acceleration and hill climbing, but much better over all cruising and corner speed entry/exit. Makes me want to have an intercooler quick just in general.

It's mainly for highway cruising and the occasional corner carving. As I don't see myself keeping these tires on for longer than 6 months out of the year. The other 6 months will have the winters for my mountain expeditions.

[81 vw pu]

Rim size is not a factor, its the overall diameter of the tires that changes your gear ratio.

a 185/70/13 is most definitely smaller than a 185/70/14..

Could very well be, I don't have the two to measure. But rim size doesn't affect your odometer/mileage, its the circumference of the tire.

[R.O.R-2.0]

Rim size is not a factor, its the overall diameter of the tires that changes your gear ratio.

a 185/70/13 is most definitely smaller than a 185/70/14..

Could very well be, I don't have the two to measure. But rim size doesn't affect your odometer/mileage, its the circumference of the tire.

rim size may not directly affect your odometer, but the bigger tire circumference on that wheel sure will make the odometer..

look you guys, im not talking to hear my brains rattle.. bigger tires and rims will make a difference.. 185/70/14 tires are big on a mk2, and HUGE on a mk1.. they DO make your odometer read slow, and 185/70/14's ARE BIGGER than 185/70/13s.. over an inch taller..

[theman53]

He isn't joking...nor was I
http://www.scirocco.org/gears/

[R.O.R-2.0]

205/50/15      (this size just used as example, because the math was easy to do in my head)

     =

205mm wide, side wall being 50% of the width of the tire (102.5mm in this case) on a 15" wheel..

if the tire size does not change, but the rim size does (205/50/16) then the tire height will increase atleast 1" from the bigger wheel..

the tire is still 205mm wide, and the sidewall is still 102.5mm, so there is NO WAY IN HELL that a 205/50/15 and a 205/50/16 are the same size.. width, yes.. height, not even close..

your 185/70/14s are ATLEAST 1" taller than your same tires on 13" wheels.. you WILL LOSE FUEL ECONOMY. if i lost 3mpg on my gasser, i expect you to see similar losses..

metric tires are measured by width, and sidewall aspect ratio, not the actual width and height like SAE tires.. (a 31x10.50, is still a 31x10.50 no matter what diameter of wheel is inside it)

with metric tires, if the tire size stays the same, but the wheel size increases, the tire diameter increases also.. plain and simple.. if you dont believe me, Wikipedia that S#!T or something...

[81 vw pu]

(a 31x10.50, is still a 31x10.50 no matter what size wheel is inside it)

Rim width will change the OD of the tire, found that out the hard way. Had to move my exhaust when I went from 10" to 8" rims with the same tires on my jeep.

[R.O.R-2.0]

(a 31x10.50, is still a 31x10.50 no matter what size wheel is inside it)

Rim width will change the OD of the tire, found that out the hard way. Had to move my exhaust when I went from 10" to 8" rims with the same tires on my jeep.

im talking wheel diameter tho, not width..

[rabbitman]

Rim size is not a factor, its the overall diameter of the tires that changes your gear ratio.

a 185/70/13 is most definitely smaller than a 185/70/14..

100% correct.

[81 vw pu]

Rim size is not a factor, its the overall diameter of the tires that changes your gear ratio.

a 185/70/13 is most definitely smaller than a 185/70/14..

100% correct.

And a 185/60/14 is smaller than a 185/70/13, and my point is just because the rim is bigger doesn't always mean the tire/wheel combo will be a bigger diameter.
You very well could end up with identical diameters between various 13" and 14" tire and wheel combinations, but overall diameter is whats gonna affect speedo and mileage.

[R.O.R-2.0]

Rim size is not a factor, its the overall diameter of the tires that changes your gear ratio.

a 185/70/13 is most definitely smaller than a 185/70/14..

100% correct.

And a 185/60/14 is smaller than a 185/70/13, and my point is just because the rim is bigger doesn't always mean the tire/wheel combo will be a bigger diameter.
You very well could end up with identical diameters between various 13" and 14" tire and wheel combinations, but overall diameter is whats gonna affect speedo and mileage.

im 100% aware..

the bigger, heavier wheel will achieve less economy tho..

ive never disagreed with you about wheel diameter..

all im saying, is that if you have 2 of the same size tires, with different wheels size, then the tires are not the same size..

[blackbird82]

Wow, you guys really worry about tires!

[8v-of-fury]

Wow, you guys really worry about tires!

Even more worry and bickering over 2-3mpg :O.. lmao Every day above 20 is GOOD FOR ME :D

[R.O.R-2.0]

its not about that.. its about being correct, and people thinking otherwise.. when ive been there and done that, got the t-shirt.. i know what happens..

and i know a thing or 2 about tires.. especially that metric tires and SAE tires are measured differently..

[DieselBalz]

Well I am still gettin an MPG done, and will have results soon (not that they are some deciding factor). But to swing it back around to the oil changes, how about some filter talk?

Found this over on Vortex http://forums.redflagdeals.com/important-oil-filters-1005723/

I am so happy I have Mann filters for the Eco I bought a 3 pack when I got it..

Now I need to figure out a better filter for the F150.

[blackbird82]

JD Filters all the way