20% OFF AIARE 1 & Recuse courses: Code AIARE20 and use the code backcountry20 for deals on select backcountry splits, boots, skis, poles, and more. Deal ends Feb 9
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The Esker Hayduke is a backcountry-ready steel hardtail built for long days and rough terrain. Refined geometry, durable 4130 chromoly, and confident handling make it a reliable partner far from the trailhead.
| Size | S1 / SM | S2 / MD | S3 / LG | S4 / XL |
|---|---|---|---|---|
| Estimated Rider Height | 5'3"–5'7" | 5'6"–5'10" | 5'9"–6'1" | 6'0"–6'4" |
Material: Custom seamless, quadruple-butted, tapered, Drawn Over Mandrel (DOM) 4130 Chromoly
Finish: ED coated
Design: Size-specific tubing
Frame Weight: 3,016 g (Medium)
Includes dropouts, UDH, axle, seat collar, and cable guides
Recommended Fork Travel:
120mm suspension fork at 30% sag (495mm axle-to-crown)
Forks within ±10mm A-C approved
Fork Offset: 44mm (all sizes)
Fork Length: 495mm (all sizes)
Headset: ZS44 (upper) / EC44 (lower)
| Measurement | S1 / SM | S2 / MD | S3 / LG | S4 / XL |
|---|---|---|---|---|
| Effective Top Tube | 597 | 626 | 649 | 683 |
| Reach | 420 | 450 | 470 | 500 |
| Stack | 615 | 620 | 630 | 645 |
| Head Tube Angle | 67.5° | 67.5° | 67.5° | 67.5° |
| Head Tube Length | 105 | 110 | 120 | 140 |
| Effective Seat Tube Angle | 74° | 74° | 74° | 74° |
| Seat Tube Length | 380 | 435 | 485 | 530 |
| Max Seatpost Insertion | 260 | 265 | 315 | 360 |
| Chainstay Length (adjustable) | 440–454 | 440–454 | 440–454 | 440–454 |
| BB Drop | 65 | 65 | 65 | 65 |
| Wheelbase (forward position) | 1130 | 1160 | 1183 | 1218 |
| Stem Length | 50 | 50 | 50 | 50 |
Rear Dropout: Esker Portage Dropout
Adjustable
UDH compatible
148mm hub spacing
M12 x 1.0 x 180mm axle
Native 180mm post mount brake
Bottom Bracket: Threaded 73mm BSA
Chainring Compatibility:
Max 34T round or 32T oval
52mm or 55mm chainline
Tire Clearance:
Designed around 29 x 2.6"
Accommodates up to 29 x 3.0"
Clearance varies by drivetrain (chainline), rim width, actual tire size, and dropout position
Seatpost:
31.6mm post
34.9mm clamp
Internally routed
