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 04-07-2010, 19:19 Post: 169838
crashey



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 front/rear ratio for kubota b7800

my last post regarded what tires and rims (turf) would fit a b7800. what I've learned , so far:
L series often have the same size tires but the rims are different

Not all tires have the same rolling circumference at the same posted size
this is important when using 4 wheel drive, tho not as critical if it's slippery

so i've found a used set of tires and rims from a b2710; oddly, the rims will fit and both tractors use the same R1 and R4 size but not the same size R3 (turf)
The b2710 uses 23x8.50x12 front/ rear 13.6x16
the b7800 uses 24x8.50x14 front/rear 13.6x16

If we assume that both tractors started with a positive slippage ratio(greater than 1) then how does the b2710 go smaller in turf in the fronts? If we assume a 1.60-1.60 front rear ratio for the b7800 then the 23 inch fronts would have a negative slippage ratio. Very weird!

The facts: Titan multi trac rolling circumferences:
23x8.50x12 is 66 inches
24x8.50x14 is 72 inches
13.6x16 is 113 inches

the formula is circumference of the front times the front rear ratio divided by the circumference of the rear

The question? what is the front rear ratio for the 2710 and the b7800?

And how can the 2710 use a smaller turf front when it's other sizes are the same as the b7800 (and the 2910, 3030,3200)?

I'm flumoxed here in mass. can any of you non new england eggheds give me an explanation?
thanks






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 04-07-2010, 21:49 Post: 169841
earthwrks

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 front/rear ratio for kubota b7800

I wouldn't focus so much on rolling circumference as it doesn't really affect the gear ratio necessarily. What is more critical is the distance from the center of the wheel to the contact point. This changes with air pressure, tire and air temp and load; two tires of different circumferences could have the same axle-to-contact point dimension simply by altering the pressure. Conversely two identical tires with different pressures would have different ACP dimensions.






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 04-08-2010, 11:53 Post: 169852
Murf

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 front/rear ratio for kubota b7800

There's really only two points that matter.

1) If you are only using turf tires in 2WD, the size doesn't matter squat.

2) As long as the rear tire is 1.6 times the rolling circumference of the front tire, everything will be fine.

Another member who isn't so active here anymore had much the same issue, but found that a pair of large off-road tires for a pickup worked better, and had better load capacity than the turfs did. You might want to look into that too.

Best of luck.






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 04-08-2010, 17:27 Post: 169858
kthompson



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 front/rear ratio for kubota b7800

Boy like the question!

EW, realize you are much older and wiser than me but the circumference has to matter or I am the one running in circles? Notice I did not post this until the Professor made reference to the circumference. Wink yeah right It would seem as the circumference increases so does the height the axle is from the ground.






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 04-08-2010, 21:00 Post: 169860
earthwrks

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 front/rear ratio for kubota b7800

Kenny BTW I'm younger than you, boy. By about what 7-8 years?

Anywho, take a dozer track--it might be 30 feet in circumference but only 24" tall when installed. Git my drift?






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 04-09-2010, 08:33 Post: 169866
magicheater



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 front/rear ratio for kubota b7800

I went through this on a B7800. Wanted wider fronts but could not find any for a 14" rim that were correct. Ended up buying 12" rims and buying a 10.5" wide R-1 that came within 2 percent of the 14" Titans. I like the solution I found.
Earthwrks: You are comparing apples to oranges.






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 04-09-2010, 10:46 Post: 169869
earthwrks

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Really. How is that?

Set me straight.

2 percent is a huge gap when talking rolling radius or circumference.






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 04-09-2010, 10:50 Post: 169870
earthwrks

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If you're referring to the track analogy, Kenny is a former crane salesman and thought he could relate to it better. Of course a track is not comparable to the rolling radius as tire but the concept is the same.






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 04-09-2010, 16:25 Post: 169878
Murf

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Quote:
Originally Posted by earthwrks | view 169860
Anywho, take a dozer track--it might be 30 feet in circumference but only 24" tall when installed. Git my drift?



Let's see, if the track is "30 feet in circumference but only 24" tall" that means the track is ~14' long.

That dozer must be a real PITA to turn around. Wink yeah right


Best of luck.






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 04-09-2010, 17:54 Post: 169881
earthwrks

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UknowwhadImean Murf. It was an analogy--poor one at bet--but one nonetheless.






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

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