A Surly Straggler uses a 12x100 mm front thru-axle at the front (12 mm x 100 mm, front). The dimensions, how to confirm it on your frame, and how it compares to the neighbouring standards.
Updated 05 September 2026.
What thru-axle does a Surly Straggler use?
The axle fitment standard on a Surly Straggler, and how to pick the right part.
| Frame | Surly Straggler |
|---|---|
| Front thru-axle | 12x100 mm front thru-axle (12 mm x 100 mm, front) |
| Axle diameter | 12 mm axle |
| Thread pitch | commonly M12 x 1.5, though 1.0 and 1.75 are also used depending on the fork |
SPINDLE see table
The Surly Straggler uses a IS42 integrated upper headset (integrated, 42 mm), a 27.2 mm class seatpost, a 12x100 mm front thru-axle at the front (12 mm x 100 mm, front) and a braze-on front derailleur.
Gravel builds are often 1x, so the front-derailleur mount can go unused. The 27.2 mm post is the class default; confirm the exact part before buying. The bottom bracket is covered on its own page.
SOURCES: BikeRadar, Road bike axle standards: the complete guide · Modern Bike, How To Measure Bicycle Thru-Axles · Park Tool, Standardized Headset Identification System (SHIS)
Questions and answers
What thru-axle does a Surly Straggler use?
A Surly Straggler uses a 12x100 mm front thru-axle at the front (12 mm x 100 mm, front).