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2.86 Pitch Wahl Bros 7 or 8 Tooth Drivers?

Gone Blue

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Howell, Michigan
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Snowmobile
08' Nytro RTX 40th Anniversary - Stretched
I think I know what which way I am going, but thought I would see what you all think. Looking to see if I should go with the 7 or 8 tooth Wahl Bros No-Slip Drivers? Thinking the 8 tooth woudl be the right call.

I had picked up a less than 1,000 mile take off track from a Polaris Assault a few years ago and stuffed it in the garage. I paid $225 for a Cobra 144" x 15" x 1.352" like new track. Not sure what I was looking at when I bought the track, but thought the track had a 2.52 pitch. I just now looked up the model number of the track before I throw it in the sled and see that it is a 2.86 pitch.

Soooo, I had been running a 144" x 15" x 1.25" Ripsaw track on my 2008' RTX the last 7,000 miles and have been happy how it performs.
Stock RTX Chain Case Gearing (21 gear)
Stock 9 tooth 2.52 pitch drivers (6.889" OD) best guess

The Wahl Bros 8 tooth 2.86 drivers have an OD of 7.125" and the 7 tooth, 6.25" OD. I am thinking with running the Wahl Bros 8 tooth drivers, keeping gearing the same, I would loose a little on acceleration but gain on top end slightly? It would seem that the smaller 7 tooth drivers might be too big a jump with stock gearing? While I should gain acceleration, I would be concerned about a noticeable drop in top end? What do you guys think?
 

As I continue to research drivers here on TY, I found that 2012-2013 Nytro RTX's had anit-ratchet 2.86 pitch drivers from the factory. Does anyone know if they will fit an 08' 1" 1/16" hex bar drive shaft and also know what the OD is of these drivers? They are basically the same money new as a set of Wahl Drivers.
 
2.86 8 tooth would be very close to 2.52 pitch 9 tooth drivers.

The later Nytros I believe had a bigger diameter driveshaft (30mm) which the drivers won't fit on your 2008 shaft (27mm if I remember correctly).
 
2.86 8 tooth would be very close to 2.52 pitch 9 tooth drivers.

The later Nytros I believe had a bigger diameter driveshaft (30mm) which the drivers won't fit on your 2008 shaft (27mm if I remember correctly).
Thanks Alan. Yeah the 9 tooth OEM drivers have an OD of approximately 6.889" vs 7.125" OD for the Wahl Bros 8 tooth drivers. A difference of 0.118" on the radius for the drivers. Dont know what to expect in performance with that small driver diameter difference but likely minimal?
 
If it was me personally, I'd run Avid drivers, there's nothing better out there, but for the average trail sled, the Wahl will work great. I would definitely do the 8 tooth, the 7 tooth will be quite a change in chassis efficiency.
 
If it was me personally, I'd run Avid drivers, there's nothing better out there, but for the average trail sled, the Wahl will work great. I would definitely do the 8 tooth, the 7 tooth will be quite a change in chassis efficiency.
Thanks again Allan. I was thinking that I should go with the 8 tooth but wanted to see that it made sense.
 


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