Surly
Mr. Whirly Crank Arm Set

We're sorry, this product has been discontinued.

Surly Mr. Whirly Crank Arm Sets are sold without spider or spindle for complete customization.

Chainrings, and chainring mounting bolts sold separately
Build it to be the crank you want: single, double, triple or trials
Armsets include non-drive side bearing adjust cap, drive side PTO bolt & cap, and two sets of spider mounting bolts (one short for spider mounting only, and one long for mounting spider with granny ring)
Outboard-style bearings must be purchased separately; use Shimano Mountain, Race Face X Type or FSA MegaEXO
Forged and machined 7075 aluminum

Specifications & Identifiers

Bolt Pattern

5-Bolt

Bottom Bracket Included?

Bottom Bracket Thread Type

English

Bottom Bracket Type

Shimano Hollowtech II

Chain Compatibility

6/7/8-Speed, Shimano/SRAM 9

Chain Rings

Not Included

Chainring BCD

58mm

Crank Arm Length

165mm, 170mm, 175mm, 180mm, 185mm

Front Derailleur Type

Mountain

Intended Use

Fat Bike, Mountain, Singlespeed

Length - Crank Arm Sets

165mm, 170mm, 175mm, 180mm, 185mm

Spindle Interface Type

Shimano Hollowtech II

Tree Fort ID:

333222346640

Have Experience With This?

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asked by: a guest
Can you mount the Surly Narrow Wide 28t chainring directly to these arms? No spider used.

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