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39 to 43 gears

K

kmo

Well-known member
Nov 27, 2007
269
71
28
Meridian, ID
I was going to try 19/43 instead of the stock 19/41 for my '07 Struther's 685 155" 2.4", but the stock 38 link chain was a smidgen too short, and the 39 link a friend gave me to try is too long. So I bought a Polaris light weight 42 tooth shaft lower gear to try. We'll see what that does.
 
B

Bull

Well-known member
Jan 20, 2004
776
106
43
colorado
i had always heard a chain stretches.......but when holding one in your hand i had my doubts.......'dem things is stout. however, i was regearing a buddies sled last year to 19-42. should need a 74P chain. the one he had had way too much slack. we just put a new 74P in and it worked perfect. when comparing the two, the old one was 1/2 inch longer when laid side by side.......translating into close to 1 inch longer!!! no she-ite.
 

Polarisrocks

Well-known member
Lifetime Membership
Sep 22, 2002
1,006
183
63
Eastern Wa
I wouldnt gear down either, unless you are ready to

tinker on your clutching all the time. You have to know the gearing way down is great for getting a full shift, but not nessesary. Gearing down so low is going to have a huge affect on how you sled is going to show its clutching problems. We have always run our sleds 20/41 2.05 spring or 19/41 2.16 winter and had great success. 2.25 is just toooo low, IMO.
 
B

Bull

Well-known member
Jan 20, 2004
776
106
43
colorado
KMO,

it was on an 03 800 rmk 151. not sure about all the specs, but it was piped (slp) not sure about the clutching. i have run that same gearing on the last several poo's i have had, as have many others. everyone LOVES it. i have not gone as low as 19-43, only 19-42. i'm not sure what clutching problems POLARISROCKS is referring too. a lot has to do with what altitude you are running as well. we run generally 9.5-12k. think about it....if you are pedaling your bike up a hill and are tired (less hp), clicking into a lower gear helps keep your heart (motor) from coming out of your chest (hood). some of the guys happy with 20/41 may be running at slightly lower altitudes. as i have said tons of times, there is no ONE right setup. just like some like poo, or doo, or cat, etc... there are preferences in how a sled feels (is setup) as well.
 
K

kmo

Well-known member
Nov 27, 2007
269
71
28
Meridian, ID
Bull, I think (but I could be wrong) Polarisrocks was possibly answering the question of the original thread poster who is contemplating a larger change than what I am. I appreciate your info though......

In my case, 19/41 is my stock gearing, and I felt the need for a bit more efficiency to turn that 155" 2.4 track faster in the deep heavy powder when the runs are long. We ride from 6,000 to 9,000 'most" of the time. I typically don't go for a big run at a hill, often I'm turning 90 degrees into a slope with little run, so I want to know that I can pull hard for the duration. Between one tooth larger on the driveshaft sprocket, and the fact that it is a lightweight sprocket, I just had my drive clutch balanced, and Carl's is throwing a lighter Holts suspension in as we speak......I think (hope) I will get what I am after. We'll see soon.
 
B

Bull

Well-known member
Jan 20, 2004
776
106
43
colorado
good luck KMO, i love my 727. have not done much to lighten other that toss on walker airs in place of stockers. love the gearing on that sled
 
K

kmo

Well-known member
Nov 27, 2007
269
71
28
Meridian, ID
good luck KMO, i love my 727. have not done much to lighten other that toss on walker airs in place of stockers. love the gearing on that sled


Thanks. Mine came with the Walker Evans shocks, I'm leaving them on the front. So what gearing are you using with your 727?
 
B

Bull

Well-known member
Jan 20, 2004
776
106
43
colorado
19-42 right now. i am going to play with the 08 700 i got and see how they run against each other. last year, the 727 smoked any of the dragons, but i did not think they were set up quite right. now i can play with my own a bit as see how they compare. may perhaps pipe the 700 as well. probably going to drop to 19-42 in the 700 as well. might try 19-43 for sheets and giggles, but the 19-42 seems to give a really good balance where we ride.
 
K

kmo

Well-known member
Nov 27, 2007
269
71
28
Meridian, ID
I actually started to put 19/43 in my 685, but the stock 38 link chain was BARELY too short, and a 39 link was too long. That's why I ended up with 19/42.

I would think that 727 should spank the 700. After riding a 700 and my 685 side by side, I liked the power of my 685 a bit better. I rode both a piped and non-piped 700. The piped 700 was close though, real close. I wasn't a real fair comparison, it was late March and the snow was pretty hard. To really compare, we needed some powder.
 
B

Bull

Well-known member
Jan 20, 2004
776
106
43
colorado
yeah, we need snow as well. like i said, i think a pipe will be a must with the 700. i liked the dragons i rode last year, just didn't feel like anyone had them dialed very well. with the way the 727 runs, i would kill to get a ride on the 840. yikes.
 
C
Nov 26, 2007
164
2
18
I know this is a old post, but a factor which isn't discussed much is the driver size. With all these gearing combo's: 19/39, 19,42, 19/43, what drivers and pitches are we using? 9,8 tooth, 2.52, 3? And ideally, what track speed do we like to reach?
 
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