Speedometer error?

[Canuck_Doug]

Actually changing to a Bridgestone Potenza RF CT on my F6 corrected my GPS/speedo error,... dead on now at all speeds.

Hey Wing'n it....I thought about doing the same thing you did. My speedo is +5% out so I was going to go one size up on the rear tire. What was your error and what size tire did you move to?