Planet X RTD 80 Geometry?

wilkij1975
wilkij1975 Posts: 532
edited April 2017 in Workshop
I'm thinking of changing my Whyte Suffolk frame for an RTD 80 from Planet X. Looking at the sizing and geometry (and being very tall) I'll need an XXL.

One thing that doesn't add up for me is the stand over height that is listed. It says it's 938mm which seems extremely high to me. I asked Planet X about this and they said that it is correct but I'm really not sure how it can be? My Whyte measures at 830mm and the geometries are not that far apart.

Anyone any experience with these that can clear this up or have any ideas?
Carbon 456

Comments

  • The Rookie
    The Rookie Posts: 27,812
    Typical axle height (700x28C) is 335mm (from cateye cribsheet).
    BB drop from geo chart is 70mm
    Seattube length is 600mm
    Seattube angle from geo chart is 72.5

    So vertical seattube height is 572mm (cos17.5 x 600)
    So to top of seattube is 335-70+572=837mm

    Given the top tube will be down a bit from the top about 820-830 seems likely.

    Using the stack from the geo the height of the headtube is 335-70+598=863mm.

    On that basis 938mm does look 'unlikely' unless you want to standover the handlebars!
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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