Moving spare tire to rear

What is the issue that you are trying to fix/change?? Are you have a lot of tire issues that are causing you to use your spare a lot?

I highly recommend an all steel ply tire like the GY G614, Sailun S367, Michelin XPS Rib and Bridgestone Duravis R250 for super reliable trailer use.

I took my new XPS Rib spare tire down for the first time since Feb 2005 recently and replaced it with one of the R250 4 year old R250 that got a 1/4 x 20 SS bolt in the tread. The R250 did not loose air as the bolt was just in the tread. I had been thinking about the brand new 11-12 year old XPS RIB hanging there so long, so it was sent off to tire heaven completely unused. BTW I have a piece of 1/2 all-thread also holding the heavy tire along with the OEM cable winch.

Chris

My guess would be that the change would be negligible. Of course by the time you reinforce the rear bumper to handle the weight...

If you feel you're that close on being overweight, you might need to look elsewhere for lightening the load.

rhagfo wrote:

Artum Snowbird wrote:
Weight times distance = weight times distance.

So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.

like this. 40 X 15 = 600 (to location of spare is 15 feet)

then X (at the pin) times (say 20 feet) would then work out X is 30

So.. taking the 40 pound tire off will drop the pin weight by 30.

Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet.

Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.

Great math, BUT the tandem axles are not a great fulcrum! :S

Also is the bumper strong enough?? Mine is just back of the axles in an under carriage mount. :B

x2 on the bumper strength. You'd likely need to add another 20 lbs of weight for a bumper beefy enough to hold the spare tire. Even then, you'd likely want to mount the spare as close to the frame as possible to minimize flex.

Lyle

Artum Snowbird wrote:
Weight times distance = weight times distance.

So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.

like this. 40 X 15 = 600 (to location of spare is 15 feet)

then X (at the pin) times (say 20 feet) would then work out X is 30

So.. taking the 40 pound tire off will drop the pin weight by 30.

Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet.

Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.

Great math, BUT the tandem axles are not a great fulcrum! :S

Also is the bumper strong enough?? Mine is just back of the axles in an under carriage mount. :B

Weight times distance = weight times distance.

So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.

like this. 40 X 15 = 600 (to location of spare is 15 feet)

then X (at the pin) times (say 20 feet) would then work out X is 30

So.. taking the 40 pound tire off will drop the pin weight by 30.

Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet.

Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.

What would be the approx. shift of weight if I move a 40 lbs spare from the front of a fiver to the rear bumper. Would the pin weight go down by approx 80 lbs? I know there could be a lot of variables but would 80 lbs a good guestimate.

It depends on the distance from the current spare location relative to the center of the axles and the new position on the bumper also relative to the axles. If you have a Sherline or other scale just move the spare and measure pin weight before and after.

I doubt you'd see at the most about a 50lb difference, 40lbs. for the tire and about 10 lbs. because of the lever factor if that much. If you're trying to lighten you pin weight then you'll have to move a BUNCH of weight inside the trl from front to rear.