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john2189
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Picture

Postby john2189 » Mon Jan 27, 2020 1:17 pm

Does anyone have a picture of an f cub with the big loboy turf tires ? I did a search but nothing came up.

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Re: Picture

Postby Barnyard » Mon Jan 27, 2020 2:17 pm

cub29bigtires.jpg
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Re: Picture

Postby Lt.Mike » Mon Jan 27, 2020 3:23 pm

Looks like a busted axle waiting to happen.
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Re: Picture

Postby john2189 » Mon Jan 27, 2020 5:43 pm

Thanks Barnyard!
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse with 42” sickle mower
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

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Re: Picture

Postby john2189 » Mon Jan 27, 2020 5:46 pm

Lt.Mike wrote:Looks like a busted axle waiting to happen.


Why would that break an axle? Other than the housing, isn’t the final drives the same?
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'72 cub (Cecilia)
'41 allis B
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'71 154 Cub Lo-Boy
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C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

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Re: Picture

Postby Dusty B » Mon Jan 27, 2020 8:30 pm

Are those 11.2 or even bigger..?
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Re: Picture

Postby outdoors4evr » Tue Jan 28, 2020 7:30 am

Hmmm... Basically the same final drive turned on the numbered lowboy. Less traction. Smaller rim and less weight (no wheel weights available).
Why would this be harder on the axle?
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Re: Picture

Postby john2189 » Tue Jan 28, 2020 8:19 am

outdoors4evr wrote:Hmmm... Basically the same final drive turned on the numbered lowboy. Less traction. Smaller rim and less weight (no wheel weights available).
Why would this be harder on the axle?


I agree, you can put all the weight you can in the tire, such as calcium or as many wheel weights and that won’t effect the strain on the axel or wheel bearings. Now if you could attach the same weight to the drawbar or frame, that’s a different story.
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'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
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C-165 Wheel Horse
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Honda 48” walk behind mower

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Re: Picture

Postby radioguy41 » Tue Jan 28, 2020 9:00 am

By moving that big tire outward like that (offset) you increase what we used to call the unsprung weight so instead of the wheel and tire putting vertical loads on the axle and axle bearing it is now putting torsional loads on the axle and torsional loads can lead to axle failure and certainly axle bearing failure. In that photo above I would also expect the center disc of the wheels to eventually crack and fail because the bolt pattern is concentrated close to the center rather than spread out closer to the rim for that size tire.
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Re: Picture

Postby Lt.Mike » Tue Jan 28, 2020 11:54 am

john2189 wrote:
Lt.Mike wrote:Looks like a busted axle waiting to happen.


Why would that break an axle? Other than the housing, isn’t the final drives the same?

[by radioguy41 » Tue Jan 28, 2020 2:00 pm
By moving that big tire outward like that (offset) you increase what we used to call the unsprung weight so instead of the wheel and tire putting vertical loads on the axle and axle bearing it is now putting torsional loads on the axle and torsional loads can lead to axle failure and certainly axle bearing failure. In that photo above I would also expect the center disc of the wheels to eventually crack and fail because the bolt pattern is concentrated close to the center rather than spread out closer to the rim for that size tire.

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He nailed it ;)
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Re: Picture

Postby Jim Becker » Tue Jan 28, 2020 12:17 pm

radioguy41 wrote:By moving that big tire outward like that (offset) you increase . . .

Any more so than when the original wheels are set for a 56" track? Without measuring, I don't think so.

radioguy41 wrote:. . . In that photo above I would also expect the center disc of the wheels to eventually crack and fail because the bolt pattern is concentrated close to the center rather than spread out closer to the rim for that size tire.

The same bolt pattern as the center disk on any Cub. Unclear why it becomes a problem in this situation.

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Re: Picture

Postby john2189 » Tue Jan 28, 2020 1:14 pm

I don’t get it...If they work on a numbered loboy, why can’t they work on an f cub?
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'72 cub (Cecilia)
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'71 154 Cub Lo-Boy
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C-165 Wheel Horse
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Re: Picture

Postby Eugene » Tue Jan 28, 2020 1:53 pm

john2189 wrote:I don’t get it...If they work on a numbered loboy, why can’t they work on an f cub?
Jim Becker wrote:The same bolt pattern as the center disk on any Cub. Unclear why it becomes a problem in this situation.
Not a problem. The load on the axle, wheel, differential, bearings would be less than a Standard Cub with 300 lbs. of weight on each tire, a fill of calcium chloride, and pulling a heavy load.
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Re: Picture

Postby Oldgoat » Tue Jan 28, 2020 6:23 pm

'what ever you say it appears to be running and looks like it been running for some time. And it looks good too.

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Re: Picture

Postby radioguy41 » Tue Jan 28, 2020 7:29 pm

Jim Becker wrote:
radioguy41 wrote:By moving that big tire outward like that (offset) you increase . . .

Any more so than when the original wheels are set for a 56" track? Without measuring, I don't think so.

There is a lot more outboard weight and hence leverage on that one. Look how deep the rim is, well beyond the Cub 56" setting.

56_inch_spacing.jpg

$_1.JPG

cub29bigtires2.jpg


Jim Becker wrote:
radioguy41 wrote:. . . In that photo above I would also expect the center disc of the wheels to eventually crack and fail because the bolt pattern is concentrated close to the center rather than spread out closer to the rim for that size tire.

The same bolt pattern as the center disk on any Cub. Unclear why it becomes a problem in this situation.

There is a lot more outboard weight and hence leverage on that one that can cause the center disc to flex beyond design capacity.
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