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  1. #1
    mtbr member
    Reputation: ThisIsMyName's Avatar
    Join Date
    Jul 2006

    Theoretical Top Tube v. Top Tube Length?

    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.

  2. #2
    Domestic Fowl
    Reputation: FreeRangeChicken's Avatar
    Join Date
    Jan 2004
    It is the measurement of an imaginary top tube parallel with the ground, not sloped, and measured from the center of the head tube to the center of the seat tube(or seat post). Bikes with a sloped top tube often give a "theortical" or "effective" TT length in their specs. This allows you to compare apples to apples with other bikes.

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