Action Shot of a Transition Spire Mountain Bike

Transition Spire

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    Transition call the Spire the "Nimble Bruiser". It's a lot of bike, but it still pedals well.

    • 170 mm 29er with a 63-degree head angle (which can be set even slacker).
    • Collet main pivot axle and Enduro MAX bearings.
    • Accessory mount.
    • Lifetime warranty for original owner.
    • Flush mounted rubber frame protection.
    • Two chainstay sizes (S/M/L and XL/XXL).
    • Dual crown fork compatible.
    • 2.6" tyre clearance.
    • Carbon frame features internal cable routing with guides.
    • Threaded BB - Boost axles - SRAM UDH (Universal Derailleur Hanger).

    Transition Spire Geometry & Sizing

    20Twenty Bike Geometry
    Transition Spire Geometry
    Sizes in MM S
    High/Low
    M
    High/Low
    L
    High/Low
    XL
    High/Low
    XXL
    High/Low
    A: Stack 619/624 619/624 628/633 637/642 646/651
    B: Reach 430/425 460/455 485/480 510/505 535/530
    C: Head Tube
    Angle
    63/62.5° 63/62.5° 63/62.5° 63/62.5° 63/62.5°
    D: Head Tube
    Length
    100 100 110 120 130
    E: Effective
    Seat Tube Angle
    79.6/79.1° 78.8/78.3° 78.1/77.6° 77.5/77° 77.2/76.7°
    F: Seat Tube
    Length
    360 390 430 460 490
    G: Effective
    Top Tube
    547/550 577/580 605/608 633/636 661/664
    H: BB Height 350/343 350/343 350/343 350/343 350/343
    I: BB Drop 25/32 25/32 25/32 25/32 25/32
    J: Chainstay Length 446/448 446/448 446/448 446/448 446/448
    K: Wheelbase 1227/1229 1257/1259 1287/1289 1322/1324 1352/1354
    L: Standover 685/680 700/695 715/710 730/725 745/740
    M: Fork Offset 44 44 44 44 44
    Seatpost Diameter 31.6 31.6 31.6 31.6 31.6
    Handlebar Width 800 800 800 800 800
    Stem Length 40 40 40 40 40
    Crank Length 165 165 165 165 165


     

    Transition Size Guide