Axle length.

[elmo]

I have decided to do the 3500lb axle with the 2000lb spring set up. I need to order my axle and have a few questions from you offroad trailer people.

I want to run a large tire or tyre as Paulc would say. I haven't purchased those yet, but thinking around the 265 on a 15" rim...I think the 265 is close to 31" tyre or tire. Any way my trailer is exactly 60" outside wall to outside wall and the frame center is 58" because it is build on 2x3" steel...are we all following still? I know you want at least 2" clearance from the tire or tyre from the wall. Does anyone have a trailer close to this that could give me the measurements of what I am looking for. I have tried to go in and talk to some people a different trailer places, but with the kids lurking and climbing on everything I wasn't getting anywhere.

Or if someone has a better suggestion....

Thanks in advance!

Elmer

[madjack]

Elmer, the numbers you want to keep in mind are the 60" outside frame rail measurment and the hub to hub measurement...the first is easy, the second is dependent on the tire/wheel combo you run. The best way, is to get your tires and wheels first and mount them up and measure from the back of the mounting face of the wheel to the outside(backside) of the tire...you then double that # add the clearance desired (for both sides) and add that to the outside frame measurement(or side wall measurement if the sides are coming down over the frame)....that will give you your H2H measurement...
madjack

[elmo]

Elmer, the numbers you want to keep in mind are the 60" outside frame rail measurment and the hub to hub measurement...the first is easy, the second is dependent on the tire/wheel combo you run. The best way, is to get your tires and wheels first and mount them up and measure from the back of the mounting face of the wheel to the outside(backside) of the tire...you then double that # add the clearance desired (for both sides) and add that to the outside frame measurement(or side wall measurement if the sides are coming down over the frame)....that will give you your H2H measurement...
madjack

I guess that would be the easy way. I thought there might be a magic solution.

I am going for what Paulc's first TD looked like for height and tires or tyres.

The wheels are no problem really I have a buddy...the one helping me weld up the trailer...or should I say he's welding it up and I hold things and run for beer and food when needed...he owns 3 auto repair places and I am going to have him order the wheels and tires. I can get about any size or offset I need, so I was hoping for a approx and order accordingly. Does that make sense or am I rambling? I am still recovering from a rough saturday night.

[upnorth]

FYI: 265 are equivalant to 32". 245's are 31". I have a Jeep rubicon that came with 245's stock and I just picked a set of 265 MTR's. They are 32".

[elmo]

FYI: 265 are equivalant to 32". 245's are 31". I have a Jeep rubicon that came with 245's stock and I just picked a set of 265 MTR's. They are 32".

Thanks for the info. At least I wasn't way off!

[Cruiser]

The 245/265 is width not height,, the 75 is height as an aspect ratio to the width,, as a 245/75-r16 is a 31" tire and a 265/75-r16 is a 32,, but if you go to a tire manufactures website look at the tire specs and it will have actual hieght and width listed. The measurements vary with different tire manufacturers too. If you look on tirerack they have lots of differnt tires avail and spec sheets on all of them.
I have the 245/75's now on my jeep but I'm going to go with the 285/75's and there 33"
Steve

[asianflava]

The 245/265 is width not height,,

That's what I thought. I didn't say anything because I figured that "It's a Jeep Thing."

[elmo]

I am actually finding out a lot about tires(or tyres...in case Paul is reading) this week. Especially about the middle # part. One of my buddies does it for a living so I really never paid to much attention until now. I am propally going with a 245/75/15

I always run bigger tires than what comes wth the vehicle but I aways thought until a couple of days ago the first # determined the size.

My Explorer has 265 comes with 235
Excursion 285 comes with 265
Blazer 33" not sure but a lot smaller...I know the 33" is the height or is it??? Damn Metric system!
Mini van...who really cares!

[angib]

I am propally going with a 245/75/15

You can use the nominal dimensions to work out tyre size:
Tyre width = 245mm
1 in = 25.4mm
Tyre width = 245/25.4 = 9.6in
Section ratio = 75%
Section height = 75% x 9.6in = 7.2in
Tyre height = wheel diameter + 2 section heights
Tyre height = 15 + 7.2 + 7.2 = 29.4in

Of course I then went to look at a tyre manufacturer's web site to see what actual height and width they quote - only to find that this size doesn't seem to be sold in the US!

Andrew

[elmo]

Thanks Andrew...I was thinking they would come in a 15, but only a 16, so that leaves me 3 options.

1. Buy 16" rims
2. Go with a 235
3. Go with a 265(I guess I would I will shoot for this one if I can)

I just ordered my axle and I will make it work some how.

It is a Dexter Torsion 9 rated for 2200lbs.
Hub face is 75"(my TD is exactly 60")
45 degrees down
and comes with a 3" tall mounting bracket.

This set up will put me at 21" frame height(depending on the tires)

[brian_bp]

...I know the 33" is the height or is it???

Yes, many people like to refer to tires on "off road" vehicles (most of which never see anything but pavement) by their overall diameter (or "height") in inches.

[brian_bp]

I am propally going with a 245/75/15

You can use the nominal dimensions to work out tyre size:
Tyre width = 245mm
1 in = 25.4mm
Tyre width = 245/25.4 = 9.6in
Section ratio = 75%
Section height = 75% x 9.6in = 7.2in
Tyre height = wheel diameter + 2 section heights
Tyre height = 15 + 7.2 + 7.2 = 29.4in

Of course I then went to look at a tyre manufacturer's web site to see what actual height and width they quote - only to find that this size doesn't seem to be sold in the US!

Andrew

Sure they are... they're just called "30x9.5-15" (overall diameter x section width - wheel diameter), because there are at least three (and likely many more) sizing systems in simultaneous use, even for interchangeable tires. For instance, in a Michelin LTX M/S, there is a 30x9.5-15, and one row above it in the size table, a P235/75R15. The first is a load range C truck tire, the second a passenger tire in standard and extra load (XL) ratings, both of the same model. A couple rows higher, and you find an LT235/75R15, load range C light truck tire... again, the same model... and another designation.

Elmo, it would help for clarity to follow the standard notation, so it's 245/75-15, or 245/75R15 (specifying a radial)... the slash goes between the width in millimetres and the aspect ratio, so we know what each number is. The inch-sized stuff (like the 30x9.5-15) uses the "x" between the height and section width.

[upnorth]

I'm glad I could help, elmo.

I did not realize my comment would spark such debate.
Elmo did mention he was interested in off road tire advice. Most should know that trail ready vehicles don't use low profile tires. It's very hard on rims. I also did mention the model of tire that I used for my comparison which was MTR (i.e. Goodyear) and most of those that use the metric system of measurements are either 70's or 75's.

And for the record, although my jeep is my daily driver, it is my third jeep and they all have seen many miles off the pavement.

[system-f]

My trailer is 60"s on the outside walls and I went with a 71" wide 3500lb axle with brakes. I am using trailer tires with a lot of backspacing and there is only 2" of clearance between the tire and body. For wider tires like a 9.5" wide tire go with at least a max of 4" backspace on an 8" wide rim and 73" wide axle or more.