Will a 225/75/15 work for a spare in place of a 205/75/15?

alwhite00

alwhite00

Active Member
May 31, 2010
1,809
Michigan
Boat Info
1997 250 Sundancer
Engines
5.7 EFI/ BIII
Found a great deal on a brand new 225/75/15 wheel & tire for my trailer. Has 205/75's on it now, Would a 225/75/15 work for a spare in place of a 205/75/15?

Tandem axle.

LK
 
I think it will. Both for 15 inch rim. My understanding is the 225 is mm width of the tread in the ground. So you will have 20mm more of rubber on the road. The 75 is the sidewalk height. So unless you are crammed in the wheel well of a trailer (which I doubt) you should be good.

Thoughts from others? Is my understanding correct?
 
225 is the width of thread on the ground 75 means the height is 75 percent of th width and 15 is rim size therefor the trailer will lean to the side with the 205. My own opinion not a good idea
 
The 205 or 225mm dimension is not the tread width. It is the width of the tire through the sidewalls at the largest point. This measurement will vary depending on the width of the rim the tire is mounted on. If all else was equal the difference in height between these sizes would be about 9/16“. On a tandem or tri-axle I doubt the lean would be noticeable or cause any problem but if it were me I’d just get the right size to start with.
 
as the 225 would be taller I wouldn't run it on there with with 3 other 205s for long
but it would be better than not having a spare at all
just use it as a spare only IMO
 
These tires are the same size with the exception of the 225 being just a little more rubber on the ground then the 205. You will not have any trouble with the 225 on your trailer.
 
With the 225/75/15 you will have 8.86" of rubber on the ground.
With the 205/75/15 you will have 8.07" of rubber on the ground.
 
EDIT, I was wrong.
 
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Ok Woody, I'm with ya now on this. :thumbsup:
 
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Yes, the 75 indicates the tire Profile. Which is the height of the tire. From the pavement to the rim. The lower the profile the rougher the ride. 50 vs 75 The smaller the profile, the side wall is thicker and less give.
 
Jim M, your putting up incorrect info.

WOODY--Not sure what you mean by this. NOT real sure you do either !!!!!!!!!!!!
 
Jim M said
“These tires are the same size with the exception of the 225 being just a little more rubber on the ground then the 205. You will not have any trouble with the 225 on your trailer.”

Jim M said
“With the 225/75/15 you will have 8.86" of rubber on the ground.
With the 205/75/15 you will have 8.07" of rubber on the ground.”

Jim M said
“WOODY--Not sure what you mean by this. NOT real sure you do either !!!!!!!!!!!!”

:huh:
Well geeepers, I'm sure what I mean is that your comments are incorrect. The tires are not the same size like you stated. Those two sizes vary in sidewall height, tire diameter, tire width, tread width and probably std rim width/per size along with load carrying capacity. The way I read your “rubber on the ground” comments “8.86” & 8.07” I am saying that is incorrect also. Those dimensions you listed are inch conversions of 225 and 205 and that is the tire’s width at it's widest, not the amount of rubber on the ground.
 
I passed on it, I looked at the clearance on the fender and it looks like it would just be too tight with the 225 and another inch in diameter.

LK
 
Jim M said:
WOODY---Your just too funny !!!

ALWHITE00--Those 225's will work just fine on your trailer.
Click to expand...
IF they were all 225s I would agree but with only 1 being a 225 it would still be ok as a spare for temporary use ONLY IMO

Jim M said:
I must apologize to everyone on this forum. There will be about 1" difference in hight.
Click to expand...
good man...we alll make mistakes :wink:
 
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