Go BottomB7200 vs B6200 tires take III final time
 | johnfundy
Join Date: Jul 2003 Posts: 71 NE Ohio 
|
2003-04-10 52942
Jiminey crickets guys!
I just needed a little advice on tires,but even with my bachelors degree I have a hard time following this. Thanks a million for the advice. Back to the subject. Mark H. talked about a front/rear drive ratio. He said it needed to be within 5%. Willie seemed to agree. How can I calculate this percentage by knowing only the circumfrence of the tires? Don't I need to know the gear ratio as well? I would like the formula to do this for this application and also future use.
Pretty soon I will announce the winner of the urination olympics.
John Fundy
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
| Pacesetter
Join Date: Jul 2003 Posts: 178 Maine
|
2003-04-10 52950
John, Catching this in the middle. If you know the circumference relationship of the original set of tires, you shouldn't have to know the ratios. IE: if the fronts are 60" and the rears 120", taking the rears as 100% the fronts would be 50%. If you change to 130" rear tires the fronts would have to be 65" (+ - ). Clear as mud??
Pacesetter ....
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
| johnfundy
Join Date: Jul 2003 Posts: 71 NE Ohio
|
2003-04-11 52962
Yes, this is as clear as mud. You take the circumfrence ratio of FRONT/BACK factory tires and you get a number, which multiplied by 100 gives a percentage.Any tires you put on in the future should be withing five perentage points of that number.
Right?
John ....
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
 Pics
|
2003-04-11 52980
Yes John. That is correct, but the 5 percent refers to the difference between the tire sizes and the gearing.
The other day I drove my 4100 in 2WD and counted the revolutions. While the rear tires turned 10 times the fronts "rolled" 14.5 turns. That told me the tire ratio: the rears are 1.45 times bigger that the fronts, or the fronts are 69.8 percent smaller than the rears.
THEN, when I repeated the same exercise in 4wd, I got the relative gear ratio, the front wheels under power turned nearly 15 revolutions over the same distance.
In real terms, in 4wd, while the tractor traveled 78 feet and the front tires rolled 80 feet.
That is about the ratio you need: over a 78 foot course (10 turns of my rear tires) the front tires need to roll between 78 and 82 feet(0 to +5 percent)in order to be properly set up.
Hope that is more clear. ....
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
Pics
|
2003-04-11 53001
Don't mean to take the fun out of this but the B-6200 takes the same tires as a newer B-7100. I also found out that on the newer B-s they are the same sizes with that chassis. But you can keep guessing and the 5% rule for lead is great. If you try to go above that you will skuff the front tires off quickly like the deere 40 and 50 series ag tractors that normally ran up to 7%. ....
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
| Morgan
Join Date: Jul 2003 Posts: 126 Albany, NY
|
2003-04-12 53015
Circumference ratio is the same as diameter ratio. Just measure the diameters, don't bother with the rest. ....
Reply to |
Quote Reply |
Add PhotoB7200 vs B6200 tires take III final time
| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
Pics
|
2003-04-12 53022
One is certainly more exact than the other. A small error in diameter is multiplied three-fold is it is used to calculate circumference. ....
Reply to |
Quote Reply |
Add Photo
Go Top
Share This