Chain case gearing for 1.75 Bc

[jp87]

I just bought a 1.75 backcountry track for my nytro xtx. I would like to drop two teeth to a 19 tooth on top chain case sprocket. If I do this can I use the stock chain? Or is a 20 tooth as low as you can go with out shortening the chain.

 

[Dimebag]

You can still use the stock chain.

I installed a 19 on top last season..

 

[Costello210]

I ran a 18 top and 39 bottom with stock chain all year last year, no problems!

 

[jp87]

Thanks guys.