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Well, you need the instructions for the speedo to start with.

Then the best method is to do a roll-out. Put a mark on the floor/ground when the valve is straight down, get on the bike and roll forward until the valve is straight down again, make another mark on the floor/ground. Measure the distance between the marks. Feed this measurement into the speedo.

If you can't be bothered to do the roll-out, the instructions for the speedo should have a chart with approximate values you can use instead.

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12y ago

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