Speedo Gears
The 185/70-13 tire diameter is approximately 23.2" tall. I've used this chart that I found online and it was pretty close. It sounds like you need a speedo gear that has 1 less tooth than you have now so that it spins a little faster. I don't know which rear end gear you have. You'll need to know that to use the chart. Or just take the speedo gear out and look at the tooth count and subtract one tooth. Good luck.
The 185/70-13 tire diameter is approximately 23.2" tall. I've used this chart that I found online and it was pretty close. It sounds like you need a speedo gear that has 1 less tooth than you have now so that it spins a little faster. I don't know which rear end gear you have. You'll need to know that to use the chart. Or just take the speedo gear out and look at the tooth count and subtract one tooth. Good luck.