Surly Mr. Whirly Singlespeed Crankset - 33 Teeth

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Description of Surly Mr. Whirly Singlespeed Crankset - 33 Teeth

Rather than restricting their stuff–and you–to the limits of category, Surly has designed multiple possibilities into their stuff as much as they can. The Mr. Whirly crank illustrates this nicely. It is the crank designed to meet your needs, even as those needs change. Run it as a single, double, or triple. Swap it between bikes. Mountain bike with it. Tour with it. Commute with it. Go nuts.

Here’s how it works. Mr. Whirly spiders are separately available in 3 common bolt circle diameters (94mm, 104mm, & 110mm) and are interchangeable, as they all connect via the 58mm BCD granny ring holes of the drive side arm. The spindle is made from cromoly steel. The arms and spiders are forged from 7075-T6 aluminium. The whole thing spins on outboard-style bearings.
This single-speed crankset comes with a durable 33T Surly stainless steel ring installed on a 58/94 mm BCD spider and a spindle for 68/73 mm bb shell width.

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 Mr. Whirly Singlespeed Crankset - 33 Teeth

Product Name: Surly Mr. Whirly Singlespeed Crankset - 33 Teeth
Manufacturer: Surly Parts
Item Code: SUR267391
Year: 2018
Material: crank arms: 7075 T6 aluminium
spindle: chromoly steel
chainring: stainless steel
Chainwheel, number of teeth: 33
Fitting for derailleur: Singlespeed
Axle profile: 24 mm splined spindle
BB shell width: 68/73mm
Bolt Circle (mm): 94/58mm
Type of chain: 9/10-speed
Chainline: 50,9 mm
Q-Factor: 170 mm
Included in delivery: crankset including BSA bottom bracket cups with spacers
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