speedometer ratio

[jug]

how do I determine if I need a 2to1 or 1to1 speedometer?

[Jerry Wieland]

What year is the bike?

[Rubone]

If it is built of mismatched parts the only way to tell is to pull the speedo drive gear to see and count the teeth.

[jug]

Jerry, got a 69 servicar but there are so many things that were missing or changed that its hard to know where I am at with this thing sometimes. at least I know I probably will not get a speeding ticket. after about 50mph the speedo is all over the place. thanks and keep the good info coming.

[jug]

Robbie, I will have to do that but how do the teeth match with each different ratios?