31.6 mm seatpost (31.6 mm) vs 34.9 mm seatpost (34.9 mm): specs compared
Updated 05 September 2026.
3
specs differ
31.6 mm seatpost (31.6 mm) and 34.9 mm seatpost (34.9 mm) differ on 3 specs: diameter, designation, typical frames.
| Spec | 31.6 mm seatpost (31.6 mm) | 34.9 mm seatpost (34.9 mm) |
|---|---|---|
| Diameter | 31.6 mm | 34.9 mm |
| Designation | 31.6 mm | 34.9 mm |
| Typical frames | many mountain bikes and gravel frames, older oversized road frames, and the other common dropper-post diameter | modern trail and enduro mountain frames wanting the largest, stiffest dropper interface |
Questions and answers
How do 31.6 mm seatpost (31.6 mm) and 34.9 mm seatpost (34.9 mm) compare?
31.6 mm seatpost (31.6 mm) and 34.9 mm seatpost (34.9 mm) differ on 3 specs: diameter, designation, typical frames.