Drive ratio help me

[adarter]

Running a harbor frieght 6.5 stock. I have a clutch with 10 teeth rear wheel is 14" outside. I have a 26 tooth sprocket came on rim . what will that run like? I have 3 more sprockets but all different mounting holes. They are 42, 54, 60 teeth. If I'm going to adapt one on, which is the first one to invest in?

 

[control4userguy]

Unmodified 212's max at 3,600 rpm. At that rate, you should see 58mph/2.6ratio, 36mph/4.2ratio, 28mph/5.4ratio and 25mph/6.0ratio. I don't understand your second question.

 

[adarter]

All the sprockets have different radius mounting holes some three bolt some four patterns.

 

[adarter]

Thank you for the info.

 

[control4userguy]

All the sprockets have different radius mounting holes some three bolt some four patterns.

Oh, I see now. Well the balance should swing more towards what you want out of the bike and less about how to mount the sprocket(s). The last build of mine used a Honda 5.5 with 6:1 reduction and it topped-out too soon. My current build is somewhere around 10:1 but I'm going for field-plowing type fun.