factors which affect stack?

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  • factors which affect stack?
  • I was looking at the geometry of the Pace rc127+, which has a really high stack – 625 for the small and 642 for the medium, 140mm fork unsagged
    I was comparing it to other 27.5+/29 bikes and none even come close in stack
    The head tube length of the Pace is short, it has slightly more bottom bracket drop
    Outside fork A-C, head tube and BB drop, what can affect stack height?
    I couldn’t figure out how pace got the stack so high compared to other bikes.


    Fork length + head tube length + BB drop.

    Here’s the geometry chart for a Kona hardtail with 100 mm forks. The 17″ frame has a stack of 601 mm. If you add 40 mm to that for the longer fork on the Pace, you get 641 mm, which is pretty much the same.


    Don’t forget that the stack height on hardtails always reads higher than it is once you’re on the bike – as the fork sags the bars drop much more than the BB does.

    The head angle makes a marginal difference. And an external lower cup on the headtube will add a little more stack height too.

    Premier Icon benpinnick

    Zero 29 stack for ML is 661mm. And its a riot to ride.

    Fork length + head tube length + BB drop.

    I thought so but I began to doubt myself when I couldn’t get it to add up

    Although head tube angle will change the rate of stack height change to fork length change but the difference for different angles is minimal

    I used the slackline originally because I ahve both sagged and unsagged figures but gave up because I don’t know the difference. In fork A-C. Then the Sherpa and Solarismax b/c they are 27.5+/29 but quoted with 120mm and even accounting for diff. in BB and fork couldn’t get within 20mm. That Kona is an good comparison, cheers.

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