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Surly Frames

Surly Lowside Frame + Fork

Surly Lowside Frame + Fork

Stock Status: In Stock
Surly says... 

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. 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 our favorite bar, the Sunrise, we decided to discontinue it. The Lowside picks up right where the 1x1 left off.

We added in some fancy new modern features like a hole for a dropper post cable, 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 also features a 110 x 15mm fork with a generous tire clearance of 27.5 x 2.8˝ or 26 x 3˝. 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.

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

Down tube water bottle mount, internal dropper post cable hole

Seatpost diameter

Seatpost clamp diameter
33.1mm (Surly stainless included)

Headset/Steerer Tube
ZS44/28.6 Upper EC44/30 Lower

Front Derailleur Clamp Diameter

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"

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

Rainbow in the Dark

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