Gearing Question: 20T / 43T - what chain?

[Joemt]

I currently have a 19T / 43T w/ 74P Chain.......can I switch the 19T for a
20T. I know a 21 does not fit with the 43T.

Thanks

my sled 2002 800 RMK

 

[BB454]

19/43-74 doesn't show up in the chart. Are you sure the bottom is a 43 and not a 41? If it is actually a 41 then yes a 20 will work with the 74 chain.

That combo goes from 2.16 to 2.05

 

[whoisthatguy]

All you do is open up the chaincase, and see how much extra slack you have when you back out your chain tightener. Adding 1 tooth to the top sprocket is roughly equivalent to using a 2 fewer teeth on the bottom sprocket.

 

[dropitp*ssy]

I would guess that it wouldn't, I would have to check for sure but I think I am running 19/43 with a 74p chain and there is just a tiny bit of slack in it I don't think i am even running the tensioner

 

[Joemt]

I for sure have the 19t / 43t and I am using the tensioner...a 21T will not go with the bottom 43t...but I thought a 20t might...but not sure...wanted to gear up alittle from the 2.26. I assumed I had a 74P chain.....

Are there any markings on the chain itself???

 

[whoisthatguy]

You count the pins to determine how many pin chain it is.

 

[Joemt]

If the chain pitch calculator I have is correct it will fit

Edge

Center Distance 7.92
Top Gear 20
Bottom Gear 43


Ratio 2.15
Chain Pitch 73.74
Round to next round number - do not round up over 1.2

((CD x2) /0.375)+((TS+BS) / 2)

Edge Chassis 7.92