Surly Bikes

Surly Bikes is a bicycle company based in Bloomington, Minnesota founded in 1998. They design bicycles, components, and, most notably, steel frames which are manufactured in Taiwan using 4130 chromoly steel. Surly is owned by and shares facilities with Quality Bicycle Products (QBP).

Components made by Surly include the dingle cog, cranksets with separately detachable spiders, a reversible chain tensioner, and fatbike rims. Surly also markets branded lifestyle products.

Frame models

In 2005, Surly began selling the Pugsley, a mountain bike with large volume tires — up to 5 inches wide — for deep snow and sand riding. The front and rear wheels share a common hub size and can be interchanged, allowing for redundancy and additional gearing combinations. Noted bicycle technical authority Sheldon Brown said, "Pugsley is, in its way, as revolutionary as the original mountain bikes were in the early 1980s."  Bicycling Magazine wrote, "It's not ideal for everyday use, but it can handle a wide variety of demands and conditions well."

In 2006 Surly introduced the Big Dummy, a longtail bike frame designed for the Xtracycle Free Radical extension that can carry 200 lbs of gear in addition to a 200 lb rider. In 2016, Surly announced an updated version of this cargo bike, which they called "The Big Fat Dummy." This model is similar to the original Big Dummy, but with fat tires, a longer top tube and a slacker head tube.

Other Surly bike models include:
Steamroller: single-speed bicycle
Pacer: road racing bike / Has been discontinued since 2018
Cross-Check: cyclo-cross bicycle
Cross-Check SS: a single-speed version of the Cross-Check cyclo-cross bicycle
Straggler: cyclo-cross inspired, light touring bike with disc brakes and 700cc size wheels
Straggler 650b: Straggler with 650b option for wheels, more agile than its larger counterpart.
Travelers Check: a cyclo-cross bicycle with S and S Bicycle Torque Couplings.
Long Haul Trucker: touring bicycle
Disc Trucker: touring bicycle with disc brakes, frame based on the Long Haul Trucker
Pack Rat : A touring bike which has front-loading capability. Latest in the offering, this bike is also effective as a commuter. It comes with a 24 pack-rack fitted on the complete bike . 
Troll: mountain/touring/commuter bike with 26-inch wheels
Karate Monkey: 29er mountain bike
Ogre: 29er mountain and touring bicycle.
Krampus: 29er mountain bike with 3inch tires on 50mm rims
Ice Cream Truck: "fatbike", accommodates wide 5" tires on 100mm rims (symmetrical rear triangle, 190mm spacing)
Big Dummy: Designed to haul cargo and passengers.
Big Fat Dummy: Designed to haul large loads with a max tire width of 5.25"
Midnight Special: a road "plus" bike with flat-mount disc brakes, 12 mm front and rear through axles. Can accommodate 650b x 60mm or 700c x 42 cm tyres"
Bridge Club: A dirt/pavement touring bike with 27.5" or 650b tires up to 2.8"
ECR: An off-road touring bike with 29er 3" tires
Lowside: A 650b mountain bike
Wednesday: A 4" fatbike that fixes the offset frame of the Pugsley
Big Easy: long tailed, electric cargo bike

Discontinued models
The following Surly cycles have been discontinued:
Conundrum: a mountain unicycle
Instigator: a Hardtail mountain Bike, reintroduced in 2014
1x1: single-speed mountain bike
Trucker Deluxe: Long Haul Trucker with S and S Bicycle Torque Couplings, allowing it to be disassembled for travel (available as frameset, with 26-inch wheels only)
Moonlander: "fatbike", accommodates wide 4.7" tires on 100mm rims (28mm offset rear triangle, akin to Pugsley)
 World Troller: This is a Troll frame fitted with Torque Coupling and S Bicycle Torque Couplings. World Troller can be disassembled and packed in a compact box for air-travel.

Components

Dingle cog: A two-speed track cog for fixed gear bicycles. It was released in early 2007.  It is a multi-speed fixed-gear cog that is compatible with standard track hubs and lockrings.  Three gear combinations are available, 17t and 19t, 17t and 20t, as well as 17t and 21t.  When used with two appropriately sized chainrings, the rear axle's position in the dropouts can remain almost the same and still allow a relatively large difference in gear ratio between the two combinations.  Bicycle Fixation's Harold Ikerd wrote, "The ability to change gear ratios while on the trail, road, or lost is heavenly!"
Singleator : A simple, effective and inexpensive way to convert bike to a singlespeed. It will adjust chainline and spring tension.
Cranks : MR.WHIRLY It is an incredibly versatile crank. The modular design allows to replace bits of parts, instead of replacing the whole crankset. It swaps spindles to use it with 68,73, and 100 mm bottom brackets. Armsets of various sizes are available in 165,170,175, 180 and 185 mm lengths. Spiders come in 3 BCD's; 94, 104 and 110. There are also complete options in singlespeed and triplespeed.

References

External links
 Surlyville: Surly Bikes home page

Category:Cycle manufacturers of the United States
Category:Companies established in 1998
Category:Companies based in Bloomington, Minnesota
Category:Mountain bike manufacturers