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850 Belt Drive [QuickDrive™]?

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850 Belt Drive [QuickDrive™]?

Is the 850 belt drive different from the 2018 Axys belt drive? Did the ratios change for the 850? Looking for information on a 163 2.6 track. Polaris and there gearing has drove me nuts for years. Any input would be great. Thanks...
 
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edgey

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I kept my pro gears off of my 17 plan on putting them on my 850
 

Teth-Air

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Divide the bottom gear by the top and then for 7 tooth drivers:

divide by 0.85 for 2.6" track

or

divide by 0.92 for 3" track

This brings gearing equivalent to 8 tooth drivers.
 

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What I found out today is the gearing is the same as 16-18. A 1.95 ratio is way to high. I think 2.37 to 2.52 would be a lot better for the mtns/trees. On non turbo sled. Doo is 2.37 to 2.62 cat I think is now at a 2.62. People complain about how weak the 800 pro is well it will be if all there pro axys mtn sleds are geared like lake racers. Don't care if there lighter just even the playing field in the gearing and clutch department then with that let's see what happens. I don't need to do 95 down the trail but I would love to see 55+ on the hill. Just my thoughts and experience.
 

richracer1

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What I found out today is the gearing is the same as 16-18. A 1.95 ratio is way to high. I think 2.37 to 2.52 would be a lot better for the mtns/trees. On non turbo sled. Doo is 2.37 to 2.62 cat I think is now at a 2.62. People complain about how weak the 800 pro is well it will be if all there pro axys mtn sleds are geared like lake racers. Don't care if there lighter just even the playing field in the gearing and clutch department then with that let's see what happens. I don't need to do 95 down the trail but I would love to see 55+ on the hill. Just my thoughts and experience.


That's just the belt drive ratio.

The final drive ratio is 2.22 which factors the 1.95 QD ratio and the 7T 2.86P drivers. Gearing down is easy, get some Pro-Ride QD sprockets, use your Axys QD belt and your gearing is into the 2.3 range.
 

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What's Kurt's gear down final ratio then? The QD comes out at 2.37?
 

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That's just the belt drive ratio.

The final drive ratio is 2.22 which factors the 1.95 QD ratio and the 7T 2.86P drivers. Gearing down is easy, get some Pro-Ride QD sprockets, use your Axys QD belt and your gearing is into the 2.3 range.

What is Pro-Ride QD sprokets?
 

sledhed

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What is Pro-Ride QD sprokets?
Quickdrive sprockets / gears off the Pro-ride chassis Pro-RMKs have one more tooth on the bottom and one less tooth on the top and fit on the Axys shafts with the stock Axys quickdrive belt, giving you a cheap gear-down. Just sold a set of those a week or so ago off my 2015 Pro for $160 shipped, may have another set for sale soon...
 

Sage Crusher

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Or quit messing around with the tiny 7 tooth drivers- and get the drive out of a 13-15 pro - now you have 8 tooth drivers ( same pitch) and a easily find gear ratio and a much flatter approach angle.
2.33 with boost @ 10 lbs is a pretty good combo-2.6 163
Most of my peeps are running the TKI system and scrapped the stock QD-
making gearing changes in the field are a snap, for daily condition changes.
 
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The Axys belt is 1/4" longer then the Pro-ride belt. So I'll to get a belt along with the gears. Looking right about $400.00.
 

sledhed

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The Axys belt is 1/4" longer then the Pro-ride belt. So I'll to get a belt along with the gears. Looking right about $400.00.
If you already have an Axys with the quickdrive belt drive system and your quickdrive belt is in good shape, you just swap out the Axys pulleys for the Pro pulleys top and bottom, reusing your existing Axys quickdrive belt, and away you go... that is the best-case scenario. You might want to replace the bolts with better ones, use loctite on them, etc.

Since you are dropping one tooth on top and adding one tooth on the bottom, the quickdrive belt length required is basically / practically identical to the original Axys belt length. That is what people who have done the calculations and the swap are doing. Just a relatively cheap gear-down that way, only expense is finding a set of Pro quickdrive gears and your time to swap them out. Generally around $150 for the gears on ebay.
 

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I saw that to but the polaris rep. said nothing has changed from the 18 800 Axys.
 

sledhed

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Polaris says different drive system. Anyone know what they changed? I’ll bet tki knows

I saw that to but the polaris rep. said nothing has changed from the 18 800 Axys.
I believe that refers to the primary drive belt, not the quickdrive system...

EDIT: This thread is a bit confusing in how it is named and based on what most of the replies have been (such as gear ratios), I have been assuming it is dealing with the quickdrive system...
 
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Reddragon800

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Im running Kurts Gear down kit. Gearing is 29 top 69 bottom = 2.38. I run 7 tooth 3' pitch Avids. Divide by 0.92 = 2.59 final.

This works very well will a 174 2.8. ill hold 44-45 mph track speed on long climbs and deep snow no problem.
 

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What is was trying to figure out is if I used older 15 grears on the new 850 to gear in down without spending the money on a tki or kurts grear down.
 
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