Making it Right: Correcting Trail with Adjustable Trees
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The trail is measured from the centerline of the axle, straight down, forward. Mark knows exactly how much this front end will collapse on the finished bike, so he compensates for that using a tradition square marked with masking tape to represent the centerline of the axle on a 21-inch wheel with tire installed. The distance from the leading of edge of the square, to the line pointed at with that nifty pointy tool in photo #2, will be our trail measurement in inches. View Related Article
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