Surly O.D. Crankset 26/39 Teeth

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Description of Surly O.D. Crankset 26/39 Teeth

Surly designed the O.D. crankset to offer frame and tire clearance while maintaining a reasonable q-factor (pedal stance). Maximizing the distance between the chain and the tire is important to running really big tires and rims on some other bike (like Surly’s Krampus, for example). With normal cranks, wide tires on wide rims can rub the chain when in the lowest, or farthest-inboard, gear combinations. The O.D. crank doesn’t just add a longer spindle to move the rings outboard. Rather, it does away with the big ring of a standard triple and moves the middle and granny rings to the outer and middle positions. This effectively moves the rings outboard without moving the arms outboard too. The O.D. is a simple, dedicated version of this idea.

Forged of 7000 series T6 aluminum, the O.D. crank is a 2-piece, with spindle embedded inextricably in the drive side arm. It’s a dedicated 2x, although its chainline is outboard a bit compared to standard mountain cranks, and it is 9 and 10 speed compatible.
This version fits 73mm BB shells on frames for 3" tires like Surly’s 29 x 3.0 Knard.

The chain rings (39/26) are designed to shift best in specific combinations.

The bearings on which they spin are also worth mentioning: Surly upgraded these bearings to aftermarket Enduro bearings with double labyrinth seals, meaning they actively shed and stay clean of dust, muck, and grime, even in wet and muddy climates.
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Fact Sheet of Surly O.D. Crankset 26/39 Teeth

Product Name: Surly O.D. Crankset 26/39 Teeth
Manufacturer: Surly Parts
Item Code: SUR177595
Year: 2018
Material: crank arms: 7000-T6 aluminium
chain rings: aluminium at 94mm BCD, stainless steel at 58mm BCD
spindle: chromoly steel
Weight: approx. 900 gram (without bottom bracket - manufacturer's specs)
Chainwheel, number of teeth: 26/39 teeth
Fitting for derailleur: SRAM and Shimano 9 and 10-speed
Axle profile: integrated 24 mm crank spindle
BB shell width: 73mm
Bolt Circle (mm): 94/58mm
Type of chain: 9/10-speed
Q-Factor: 173,3mm
Included in delivery: crankset including BSA bottom bracket cups
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