It’s important that you use the level to make sure these 2 points are as high as one another. The piece of tape should be straight across from the intersection of the head and top tubes at the exact same height. It wouldn’t hurt to place a tiny piece of masking tape at the point you measured, so you won’t forget where to measure the effective top tube length.This will likely be a few inches above where the physical top tube intersects with the seat tube. Hold the level flat (so the air bubble rests at the center of the liquid it’s suspended in) and note where it intersects the seat tube. To measure the length of a slanted top tube, you’ll actually be measuring what’s called the “effective top tube.” Put 1 end of a level at the point where the top tube intersects the head tube. The top tube, as its name suggests, runs roughly parallel to the ground between the seat post and head tube (at the base of the handlebars). Compensate for a slanted top tube by measuring the effective top tube.
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