Surly Lowside MTB frameset 26+/27.5' rainbow in the dark

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  • Lowside

    Remember when you were a kid and still had ambitions in life and riding your bike felt like pure freedom? Rolling around town without a care in the world, heading to friends’ houses, and being home in time for dinner were all in a day’s work. There was nothing you couldn’t do. You were unstoppable.

    Now you can relive that joy as a “grownup” on the Lowside without all those pesky hopes and dreams getting in the way. The Lowside is the bike that gets you across town for a quick rip on singletrack, then over to the bar for a night out. You might even still make it home before dinner.

    It should come as no surprise that singlespeeds run deep in our DNA and have since day one. Let’s take a brief jaunt down the ‘ol memory lane, shall we? Way back in ’98, we launched the 1x1 Rat Ride. It was our first frame, and, for a lot of people, a first foray into the world of singlespeeds. After many years and many trips to the Sunrise, we decided to discontinue it a couple years back.

    The Lowside picks up right where the 1x1 left off. While not technically a dedicated singlespeed due to its derailleur hanger, the frame doesn't include any derailleur cable guides because, well, we want you to ride a singlespeed. If you do decide to run a 1xWhatever setup, you’ll wanna grab some zip ties or something. We added in some fancy new modern standards like a dropper post cable hole, our Gnot Boost rear spacing, and thru-axles but don't let all that scare you. We didn’t leave you late-adopters behind. Lowside’s Gnot-Boost rear spacing is compatible with 142 x 12mm or 148 x 12mm thru-axle rear hubs as well as 135 x 10mm QR hubs (when using 10/12 Adapter Washers). That cross compatibility makes the Lowside a perfect parts-bin bike. If you have parts lying around, chances are they’ll work (unless you have rim brakes, those won’t work here).

    Lowside frame and fork have generous 27.5 x 2.8" or 26 x 3.0" tire clearance, and although the frame is spec'd with a rigid 420mm fork with boost 110 x 15mm axle spacing, the frame is approved for up to a 100mm travel 27.5 suspension fork. We spec it with 26+ Dirt Wizards and a Sunrise Bar so you have no excuse to be boring. Hop curbs, cut through alleys, and find some shortcuts. If you’re looking for some mischief on the way to the trail, you can find it on Lowside.



    • Tubing: Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded. ED Coated. Heat-Treated chain stays
    • Rear Dropouts: Investment cast Surly 12mm horizontal dropouts with derailleur hanger, 145mm Gnot Boost spacing works with 142 or 148mm spaced hubs. Convertible to 135x10mm QR with Surly 10/12 adapter washers (sold separately)
    • Brake Compatibility: 51mm I.S. disc, 180 Max Rotor Size
    • Braze-ons/extras: Down tube water bottle mount, internal dropper post cable hole
    • Seatpost diameter: 30.9mm
    • Seatpost clamp diameter: 33.1mm (Surly stainless included)
    • Headset/Steerer Tube: ZS44/28.6 Upper EC44/30 Lower
    • Front Derailleur Clamp Diameter: 34.9mm
    • Bottom bracket shell: 73mm shell width, threaded standard English (1.37˝ x 24t)
    • Chainring Clearance: Singlespeed Only: 34t at 55mm chainline; 40t at 57mm chainline
    • Tire Clearance: 27.5 x 2.8"
    • Fork: 1-1/8", threadless, 110 x 15mm, 51mm I.S. Disc, 26 x 3.0" or 27.5 x 2.8", individual tire and rim combos affect tire clearance
    • Color: Rainbow in the Dark


    Frameset
    • Frame: Surly Lowside Frame
    • Fork: Surly Lowside Fork
    • Seatpost Clamp: Surly Stainless 33.1mm clamp


    Geometry - Rigid Fork



    XSSMMDLGXL
    Seat Tube Length
    (Center-Top)
    316.0366.0416.0466.0516.0
    Top Tube Length
    (Center-Center)
    562.4575.6589.7608.5630.4
    Effective Top Tube Length
    (Center-Center)
    570.0590.0610.0630.0650.0
    Head Tube Angle70.070.070.070.070.0
    Seat Tube Angle74.074.074.074.074.0
    BB Drop55.055.055.055.055.0
    Chainstay Length425.0425.0425.0425.0425.0
    Wheelbase1068.01089.01110.01131.01152.0
    Standover Height700.0729.0762.0792.0823.0
    Head Tube Length110.0125.0140.0155.0170.0
    Fork Length420420420420420
    Fork Offset47.047.047.047.047.0
    Stack542.2560.3574.4588.5602.5
    Reach414.5429.3445.3461.0477.0


    *Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø710mm

    Geometry - Suspension Fork



    XSSMMDLGXL
    Seat Tube Length
    (Center-Top)
    316.0366.0416.0466.0516.0
    Top Tube Length
    (Center-Center)
    562.4575.6589.7608.5630.4
    Effective Top Tube Length
    (Center-Center)
    578.0598.0618.0638.0658.0
    Head Tube Angle67.367.467.567.567.6
    Seat Tube Angle71.471.471.571.571.6
    BB Drop35.636.036.436.737.0
    Chainstay Length425.0425.0425.0425.0425.0
    Wheelbase1077.01098.01119.51140.51161.5
    Standover Height729.0755.0787.0817.0848.5
    Head Tube Length110.0125.0140.0155.0170.0
    Fork Length468.0468.0468.0468.0468.0
    Fork Offset42.042.042.042.042.0
    Stack564.5579.8593.5608.0622.0
    Reach388.0403.7419.5435.5451.0


    *100mm suspension fork @25% sag
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  • Attachements
    LOWSIDE FRAMESETinstruction manual
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