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Item # SRY0006

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Item # SRY0006


Surly’s Mr. Whirly isn’t what you did to your friend at a party in college—well, maybe it is—but it’s also Surly’s badass answer to the single-speed crankset. Mr. Whirly’s arms and spider are forged from hardy 7075-T6 aluminum and connect to a durable 33t stainless steel chainring for rock-slapping, log-hopping pleasure.

  • Cro-Moly spindles provide reliability and strength
  • Common 58/94mm bolt-circle-diameter (BCD) for hassle-free chainring interchangeability
  • All basic assembly hardware included
  • Spindle fits 68/73 BB shells

Tech Specs

Arm Material:
Forged 7075-T6 aluminum
Arm Length:
175 mm, 180 mm
Bottom Bracket:
external cup
Claimed Weight:
953 g
Manufacturer Warranty:
mountain biking, commuting, beer-runs
Recommended Use:
1 year

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Here's what others have to say...

Can anyone explain the difference between...

Can anyone explain the difference between the two different sizes?

Best Answer

About 5mm. The numbers refer to the measurement of the crank arm, from the center of the bottom bracket hole to the center of the pedal hole.