Spare Tire

[thepretzelman]

I recently put 285/75/16's on my truck and I was thinking what would happen if I got a flat can I put on my factory spare tire which is a 245/75/16 or about a three inch difference, probably not. So I want to get a bigger spare tire I just don't want to have to put it in the bed. Has anyone modified the thing that holds on the spare tire for a bigger one? If so how?

 

[dogboy]

I was under the impression that a 285/75/16's and a 245/75/16 where the same hight just differnt widths?


I have 33's and run the stock spare.. All though it is not the best idea by any means, but oh well.

If you have larger diameter tires and you also have a limited slip (or locker) in the rear, the rear tires just have to be the same diameter becuase they have to spin the same speed. So, if you get a flat on the rear, you will have to put the spare on the front (move a front tire to the back) and run 2wd instead of 4wd. But if you have lockers/ limited slips font and rear, you are pretty much screwed. you HAVE to have a fullsize spare unless you unlock one (or both) front hub(s) with the spare being on the front axle.


But to answer your question about the spare tire holder, I don't really think it is very easy.. You are better off making a bracket and mounting the tire in the bed in my opinion.

 

[koda6966]

I was under the impression that a 285/75/16's and a 245/75/16 where the same hight just differnt widths?

No, the first number is the height. The middle number is the width. And the last number is the rim size.

I run 235's on my truck, but my spare is either a 215 or a 210, probably the 215. I'm afraid to use it as well.. would it possibly hurt my truck?

Once you get thinking about it, two different size tires are going to have two different strides. Sounds like it could twist and break an axle.
This is a good question, I've been wondering it as well.

 

[dubnutts]

do what i do

for the tires you are running they are 32.8 in diameter and 11.2 wide the spare you have would be 30.5 in diameter and 9.6 wide. So i wanna say dont use the spare. So just do what most guys do and put it in the back with a chain securing it to your truck bed thats what i do with my other truck

 

[dubnutts]

wrong

No, the first number is the height. The middle number is the width. And the last number is the rim size.

I run 235's on my truck, but my spare is either a 215 or a 210, probably the 215. I'm afraid to use it as well.. would it possibly hurt my truck?

Once you get thinking about it, two different size tires are going to have two different strides. Sounds like it could twist and break an axle.
This is a good question, I've been wondering it as well.

P285/75R16
P is the type of tire aka Passenger
285 is the width of the tire from the inner most part of the tire to the outer most part of the tire. it is measured in millimeters
75 is the percent of the height of the tire from the rim to its max diameter, is the percent compared to the width: so it is 75 percent of 285
R is the construction of tire in your case it is a radial type
16 is the rim diameter

 

[85_Ranger4x4]

I wouldn't put it on the rear if you have a long ways to go, just put it on the front and put the front tire on the rear (if you have a flat on the rear)

Really it would just be the reverse of a car using a donut spare tire, I think they recomend 50 miles at 50mph or something for max distance/speed on those.


I have 255/70-16's on my F-150, there is a major difference sizewise between that and my 235/70-15 spare, it worked fine the last time I used it.

 

[koda6966]

I wouldn't put it on the rear if you have a long ways to go, just put it on the front and put the front tire on the rear (if you have a flat on the rear)

I've never thought of it that way. Good idea.

P285/75R16
P is the type of tire aka Passenger
285 is the width of the tire from the inner most part of the tire to the outer most part of the tire. it is measured in millimeters
75 is the percent of the height of the tire from the rim to its max diameter, is the percent compared to the width: so it is 75 percent of 285
R is the construction of tire in your case it is a radial type
16 is the rim diameter

That's exactly what I said, just using different words, and getting more technical.

 

[edgeaholic (tm)]

your spare tire is not a 245/75 16 UNLESS you changed it out. because the 2000 ranger 4x4's came with 235's stock and a spare tire of the same dimentions.

 

[07rangersport]

I've never thought of it that way. Good idea.


That's exactly what I said, just using different words, and getting more technical.

nope. you said that the first number was the height lol

 

[koda6966]

nope. you said that the first number was the height lol

Actually his innermost part of the tire and his outermost part of the tire is the height of the tire from rim to tread. We WERE talking about the same thing, just the tire he pictured is flat while mine is standing up.

 

[07rangersport]

Actually his innermost part of the tire and his outermost part of the tire is the height of the tire from rim to tread. We WERE talking about the same thing, just the tire he pictured is flat while mine is standing up.

That makes zero sense. I know what your saying but that isn't how you read a sidewall.

 

[98ranger4x4]

That makes zero sense. I know what your saying but that isn't how you read a sidewall.

+1 first number is the section WIDTH (width of the tread)
second number is the aspect ratio (percentage of width that equals the sidewall height from the rim to the outermost point on the tire)
last number is rim height.
so in the case of a 245/75 16 vs a 285/75 16 the 285 will be wider AND taller
(trying to explain it simpler)

 

[koda6966]

+1 first number is the section WIDTH (width of the tread)
second number is the aspect ratio (percentage of width that equals the sidewall height from the rim to the outermost point on the tire)
last number is rim height.
so in the case of a 245/75 16 vs a 285/75 16 the 285 will be wider AND taller
(trying to explain it simpler)

Hmm.. I guess I get what your saying.
Thank you for explaining it simpler instead of just telling me I was wrong.