Name: Esker Hayduke
Brand: Esker

Esker Hayduke frame geometry, drawn to scale

Every tube angle and length below is from the published chart, not an illustration. The front triangle area is the number that decides which frame bags fit — and it changes a lot across sizes.

Esker Hayduke — S1/SM. Front triangle ≈ 1089 cm² · effective top tube 597mm · seat tube 380mm — Esker Hayduke in size S1/SM, drawn to scale from Esker's published geometry. The shaded area is the front triangle — roughly 1089 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Esker Hayduke — S2/MD. Front triangle ≈ 1313 cm² · effective top tube 626mm · seat tube 435mm — Esker Hayduke in size S2/MD, drawn to scale from Esker's published geometry. The shaded area is the front triangle — roughly 1313 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Esker Hayduke — S3/LG. Front triangle ≈ 1517 cm² · effective top tube 649mm · seat tube 485mm — Esker Hayduke in size S3/LG, drawn to scale from Esker's published geometry. The shaded area is the front triangle — roughly 1517 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Esker Hayduke — S4/XL. Front triangle ≈ 1745 cm² · effective top tube 683mm · seat tube 530mm — Esker Hayduke in size S4/XL, drawn to scale from Esker's published geometry. The shaded area is the front triangle — roughly 1745 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

What it can carry

Mount provision and clearance, as Esker publishes it.

Max tyre clearance

29x3.0

Dropper post

Compatible

Geometry

All figures in millimetres except angles. Effective top tube and seat tube are the two that decide frame bag fit.

Size	Eff. top tube	Seat tube	Standover	Head tube	Stack	Reach	Chainstay	Wheelbase	BB drop	Head angle	Seat angle
S1/SM	597	380	—	105	615	420	440-454	1130	65	67.5°	74°
S2/MD	626	435	—	110	620	450	440-454	1160	65	67.5°	74°
S3/LG	649	485	—	120	630	470	440-454	1183	65	67.5°	74°
S4/XL	683	530	—	140	645	500	440-454	1218	65	67.5°	74°

Bottom bracket height

Roughly 310mm off the ground. Eskerdoesn't publish this directly — we derive it from their BB drop and a typical 75cm tyre diameter, so treat it as indicative rather than exact. It changes with the tyre you fit. Lower means more stable and more pedal strikes; higher means the opposite.

Source — Esker's own geometry chart: https://eskercycles.com/products/2026-hayduke — checked 2026-08-16. A dash means the figure isn't published; we leave it blank rather than estimate.

Which frame bags fit

Every frame bag we track, checked against this frame's published geometry. Pick your size.

Checking 12 frame bags against a 649mm effective top tube and 485mm seat tube. 12 fit.

Read these as conservative. This size has a steeply sloping top tube — the seat tube is only 75% of the effective top tube. Bag makers publish a minimum seat tube length assuming a roughly level top tube, so on a frame like this the comparison understates how much room you actually have. The front triangle here is about 1517 cm², which is the number that actually decides what fits. Several bags marked unlikely below will physically fit. Half-frame bags don't depend on seat tube length at all.

Excellent fit

Topeak Midloader Frame Bag