I've been looking at the Norco Fluid 1 as a possible second bike, and first full suspension bike. I've been comparing the geometry to the hardtail I already have. However, on Norco's website, they have "theoretical top tube length" and "top tube length" measurements listed. I don't know what the difference between the two measurements is? Isn't the top tube length of a bike the top length of a bike? If it's 23 inches isn't 23 inches? The difference between the two measurements is substantial. The difference is almost an inch.
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