Batesville JR3
- Thread starter Ragnar
- Start date
racing promotor
Moderator
I know nothing about batesville, but if you got em rolling good it should be all about the tires !!
JRC_Performance
Member
Cross 66
Left 58
Nose 45.5
+.5 lf
-2.25 rf
1 1/2 front
1 3/4 rear
8/12 castor
Lf and rf L blocks rear position
Cross pills out
Lead pills out
Rr 3/16 off frame
Lr 1” off frame
message me for tire info.
alvin l nunley
Site Supporter
Do you mind me asking what your scale weight was the last time you raced jr3?
alvin l nunley
Site Supporter
I see where the manufacturers recommend Rear tread widths of about 39.5", give or take. How does that match up to your, "off the frame", recommendations? What's the conflict between those 2 measurements?
JRC_Performance
Member
I go off frame distance to the wheel due to the fact that either:
A: back spacing from brand to brand tend to be a tad different
B: a lot of racers will not use the same location for tread patch as the next.
So it is just easier to measure off the frame to the wheel
alvin l nunley
Site Supporter
In your experience, are all frames the same width, center to center?
If the rear wheels are spaced off the frame, how do you compensate for different width tires and different width rims, and different width rim combinations.
What about the relationship between the width and position of the front axle versus the rear axle. What about the relationship between the RF tire and the RR tire? I've heard other people say that those 2 tires need to be in-line with each other. I know, too many questions, sorry.
JRC_Performance
Member
No idea what the measurement is from frame to frame. I just know what the Ultramax chassis line ups need with wheel spacing.
All chassis that run on dirt need to have a 10” wheel on the rs and either a 8.5” (most common) wheel or a 8.25 or 8.75 wheel.
I don’t care what the front “axle” vs the rear axle is in position with each other. The front can’t be compared to the rear as the lf and rf are independent so to call it an axle is false.
you can look at any of the new dirt offset chassis from the top manufacturers and no rf will be in line with the rr. That’s for the chassis builder to have the knowledge on why it is built that way. I understand why as I have had input on some chassis’s built.
Believe half of what you hear/read and nothing that you see on this site.
All chassis that run on dirt need to have a 10” wheel on the rs and either a 8.5” (most common) wheel or a 8.25 or 8.75 wheel.
I don’t care what the front “axle” vs the rear axle is in position with each other. The front can’t be compared to the rear as the lf and rf are independent so to call it an axle is false.
you can look at any of the new dirt offset chassis from the top manufacturers and no rf will be in line with the rr. That’s for the chassis builder to have the knowledge on why it is built that way. I understand why as I have had input on some chassis’s built.
Believe half of what you hear/read and nothing that you see on this site.
racing promotor
Moderator
I've never raced I just wrench on them, but last I helped with Jr 3 weight was 320 lb min
Pete_Muller
Moderator
Al,
I believe that a "one size fits all" approach (to measuring tread width) is not how most of the racers here are approaching this.
Rather, I suspect that many chassis manufacturers have done a good amount of testing, and simply provide a "chassis to wheel" dimension, as that's become a somewhat accepted method of setup.
PM
I believe that a "one size fits all" approach (to measuring tread width) is not how most of the racers here are approaching this.
Rather, I suspect that many chassis manufacturers have done a good amount of testing, and simply provide a "chassis to wheel" dimension, as that's become a somewhat accepted method of setup.
PM
alvin l nunley
Site Supporter
PRC doesn't, they still measure across the rear tread width. I believe that measuring off the frame, ignoring the front tread width and position to the centerline of the kart, ignores many aspects of handling set up.
alvin l nunley
Site Supporter
Here are all your numbers, taken from suggestions by JRC.
Knowing your actual racing weight would've helped.
Attachments
JRC_Performance
Member
Have you verbally talked to prc and have them tell you exactly that?
JRC_Performance
Member
your spreadsheet tells everyone who owns a set of scales absolutely nothing that we already don’t know about the wheel weights when the percentages are met.
My numbers I posted are not a suggestion they are what the Ultramax customer should put in the kart for Batesville in that particular class.
Quit confusing yourself that leads to confusing others on this site.
My numbers I posted are not a suggestion they are what the Ultramax customer should put in the kart for Batesville in that particular class.
Quit confusing yourself that leads to confusing others on this site.
alvin l nunley
Site Supporter
No, I went to the website and look at their setup sheets on Their latest model. Perhaps there has been no update?
alvin l nunley
Site Supporter
Let me ask you this; I put my kart on the scales, the scales tell me what percentages I have, but the percentages are different from what you say they should be, what's my next step if I want to match your percentages?
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