Surly Krampus MTB frameset 29+ tangled up in blue

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  • Krampus is a dedicated 29+ trail bike that can go over, off of or through just about anything in its path.

    Breaking the Mold with a 29er Bike

    As the first plus bike to hit the market, Krampus changed the way many people approach trail riding. Its shown people the light of how high volume, large diameter tires can vastly improve the ride experience. Its also done a bang-up job dispelling the myth that big tires make you slow.

    Krampus is kind of like the opposite of a mullet: long in the front and short in the rear. With a long toptube and compact chainstays, it takes trail-shredding abilities to the next level. A mullet may be business in the front, party in the back but Krampus makes partying its business.

    "Lean back, hang on, and ride that wild horse." -Thor

    • Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension corrected fork
    • Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though)
    • Clearance for 29" x 3" tires


    Frameset
    • Frame: Surly 4130 Chromoly Steel
    • Fork: Surly 4130 Chromoly Steel
    • Seatpost Clamp: Surly stainless, 33.1mm


    Geometry




    SM
    MD
    LG
    XL
    Reach 404 426 448 470
    Stack 593 602 612 621
    Head Tube Angle 69.0 69.0 69.0 69.0
    Head Tube Length 90 100 110 120
    Seat Tube Length 368 419 470 521
    BB Drop 65 65 65 65
    Wheelbase 1087 1113 1138 1164
    Chainstay Length 435 435 435 435
    Top Tube Length, Actual 556.8 573 595.1 621.8
    Top Tube Length, Effective 585 610 635 660
    Seat Tube Angle 73.0 73.0 73.0 73.0
    Standover Height 770 797 825 853
    Fork Length 483 483 483 483
    Fork Rake 47 47 47 47
    *Standover is measured from the top of the TT, at the center, with a tire measuring approximately 773mm

    Specifications
    • Frame Construction: 4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, ED coated
    • Fork Construction: 4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated
    • Rear Dropout Configuration: Horizontal slotted with optional vertical dumpout
    • Rear Hub Spacing: "Gnot-Boost" 145mm, 12 x 142mm or 12 x 148mm (Surly axle included), 10 x 135mm with Surly 10/12 Adapter Washers (not included)
    • Front Hub Spacing: 15 x 110mm (Surly axle included)
    • Rear Brake: Disc 51mm I.S. (203mm max rotor)
    • Front Brake: Disc 51mm I.S. (203mm max rotor)
    • Head Tube: 44mm
    • Steerer Tube: 28.6mm (1-1/8")
    • Crown Race: 30mm (1-1/8")
    • Headset Upper (S.H.I.S): ZS44/28.6
    • Headset Lower (S.H.I.S): EC44/30
    • Seat Collar: 33.1mm
    • Seatpost: 30.9mm
    • Max Chainring (CL) [3]: 1x (Mtn): 28T, 1x (Boost): 30T, 2x (Boost): 24/36T
    • Bottom Bracket: 73mm threaded (1.37" x 24TPI)
    • Tire Clearance Frame [1]/[2]: 29 x 3.0
    • Tire Clearance Fork [1]: 29 x 3.0
    • Rigid Fork Spec: 483 x 47mm
    • Max Suspension Fork Length [4]: 550 x 51mm (29+ 120mm)
    • Bottle Mounts Frame: 1 Standard + 1 Three-Pack
    • Bottle Mounts Fork: 2 Three-Pack
    • Rack Mounts Frame: Yes (upper and lower threaded)
    • Rack Mounts Fork: Yes (upper, lower, and mid-blade threaded)
    • Fender Mounts Frame: Yes
    • Fender Mounts Fork: N/A
    • Other Features: Internal dropper post routing compatible


    [1] Different tire and rim combinations will result in different clearances.
    [2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not the frame.
    [3] Listed chainring clearance is worst case scenario. Clearances vary widely depending on components and configurations.
    [4] Suspension fork length listed at full extension (not at sag)
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