what size sprocket

[highbars]

Hi I,m building a trike rear for my evo fatboy and was wondering what size rear sprocket to use. Thanks in advance

 

[Gorilla]

I have a 70 tooth on mine.

 

[highbars]

Thanks Gorilla. sounds like you have a belt drive. I'm going chain, i have a diff that was on a road king but its runin a 35 tooth and all the chain drive evo bikes i've seen are 48. The 35 rear with a 21 front will give me a final ratio of 1.6 and i beleave that i need to be 2 to 1 final ratio.

 

[highbars]

I'm thinking I will need to faricate a new diff housing so i can get these ratios right. Any advise is welcome this is my first trike and I'm flying by the seat of my pants on this one.