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avid 9 teeth 2,86 pitch

me and mr indy were just talking about that on the 2.86 pitch

I don't have the 9 tooth measurements on hand
 

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Brock said:
me and mr indy were just talking about that on the 2.86 pitch

I don't have the 9 tooth measurements on hand
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Should be 8.19 diameter with 9 tooth 2.86 pitch, Pie D equals circumference so take 9 times 2.86 equals 25.74 and divide that by 3.14 equals 8.19 which is the diameter. Pie is always 3.14
 
Thanks for the formula.

So 8.19(9 tooth)-7.283(8 tooth)= .907"
So it's .907" bigger circumference . So it would be half that closer to tunnel/heat exchanger (.453")
 
TPRO8 said:
Should be 8.19 diameter with 9 tooth 2.86 pitch, Pie D equals circumference so take 9 times 2.86 equals 25.74 and divide that by 3.14 equals 8.19 which is the diameter. Pie is always 3.14
Click to expand...
thanks for the formula .

Ok i am not very good with this décimal , it's .453 equal to 29/64 ( 7/16 strong). I will go measure the stock clearance
 
.453 is 7/16" strong yes

So it's 7/16" closer to tunnel/ heat exchanger
 
stock clearance with heat exchanger is 2 " 1/4 with the cobra track . no problem fit to avid 9 teeth . if I make the formula with 10 teeth, 10 x 2.86 / 3.1416 = 9.10. 9.10 - 7.283 = 1.71 /2 = . 858 (55/64) bigger diameter no clearance problem with 10 teeth .
 
What is the benefit of running a 9 teeth with the 2.86 pitch??
 
Michael said:
What is the benefit of running a 9 teeth with the 2.86 pitch??
Click to expand...
there are two main ones..better rolling resistance and the gearing change , dropping ratio and not giving up top speed from the gear down, its the best of both worlds..example if you like the 1.74 ratio and you want to keep that with 9 tooth drivers,you will be about a 1.94 ratio in the chain case..thats where your mid range will pick up huge,and turn to turn on the trail.without sacrificing top speed..
 
as doc said

It's simple

Larger dia. drivers increase top speed and reduce rolling resistance.
It lessens the sharp attack angle of track too.
 
Ok!! so to take full advantage of it, we must gear it down much more than 1.73-1.76, if i understand correctly!?
It's very tempfull, i wonder if an oem part can be used?
 
What track do you guys think would be faster 2.52 or 2.86 the 2.86 will be a lighter track will it be faster???? I have a 1,25 rip saw2 and had a 2,52 cobra on my previous pro r by seat of the pant cobra felt faster was it track type or the 2,52 on the fence on going back to a cobra because it will be cost effective just to change drivers and keep my ripsaw then both drivers and track but if 2,52 is faster that will be the way i have to go
 
Michael said:
Ok!! so to take full advantage of it, we must gear it down much more than 1.73-1.76, if i understand correctly!?
It's very tempfull, i wonder if an oem part can be used?
Click to expand...
Your best bet is a driver from Avid, what ratio do you want to run? And don't get confused between 9 tooth 2.86 and 10 tooth 2.52..
Md. Indy... the speed comes from lighter weight and short lug height, it's all about efficiency and resistance. A 1 inch track will move less air then a 1-1/4 track. Most manufacturers in the day built low lug tracks that were 2:52. Now with 2.86 and higher the lug height has increased. So if you could find a 2.86 1 inch track it would be lighter then a 2.52 1 in track because of fewer bars, this could easily be faster then the 1 in 2:52..
 
The 2017 XCR went back to 2.52 pitch 9 tooth drivers with cobra track last year. they said it was faster than 2.86 pitch just what i read.
 
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Dr.Notadoo said:
Your best bet is a driver from Avid, what ratio do you want to run? And don't get confused between 9 tooth 2.86 and 10 tooth 2.52..
Md. Indy... the speed comes from lighter weight and short lug height, it's all about efficiency and resistance. A 1 inch track will move less air then a 1-1/4 track. Most manufacturers in the day built low lug tracks that were 2:52. Now with 2.86 and higher the lug height has increased. So if you could find a 2.86 1 inch track it would be lighter then a 2.52 1 in track because of fewer bars, this could easily be faster then the 1 in 2:52..
Click to expand...

I have a 1.76 ratio but wanna change to 1.74 since it seem to be a more efficient ratio, like the idea of removing rolling resistance. It's why I'm interest in this 9 tooth driver thing and big wheels at the back too!!! But i think my 1.356 cobra track with stud will be a problem for clearance...
 
IMG_0098.JPG
This is one step further then just 10 tooth drivers and 8 inch rear wheels.. 144 inch hacksaw in a 137 skid . I used to run 24/40 with 8 tooth 2.86.. with the 10s I run 23/43..( 1.86) so it works out to 1.67 once you factor the big drivers in. The 1 inch track is huge for acceleration to compliment the gearing and big drivers..
 
Dr.Notadoo said:
View attachment 2137This is one step further then just 10 tooth drivers and 8 inch rear wheels.. 144 inch hacksaw in a 137 skid . I used to run 24/40 with 8 tooth 2.86.. with the 10s I run 23/43..( 1.86) so it works out to 1.67 once you factor the big drivers in. The 1 inch track is huge for acceleration to compliment the gearing and big drivers..
Click to expand...
very nice set up Div20
 
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