Specialized Alloy Single Bolt Seatpost (rigid)
Seatpost (rigid): 30.9 mm diameter. 1 verified variant.
What the checker says3will not fit
Run variant by variant through the mountain bike builder’s own engine. Every sentence below is the checker’s, unedited. Nothing here says this part fits your bike; it says what it does and does not fit among the parts we hold.
Checked against 6104 verified mountain bike parts in this catalog. 5904 produced no finding of any kind.
Will not fit
- Will not fiterror · FrameSeatpost too small: Frame seat tube is 31.6mm but Seatpost is 30.9mm. A shim or adapter may make other sizes or standards work, but that is a modification, not a fit. On 153 of the 258 verified frames in this catalog.
- Will not fiterror · FrameSeatpost too small: Frame seat tube is 34.9mm but Seatpost is 30.9mm. A shim or adapter may make other sizes or standards work, but that is a modification, not a fit. On 41 of the 258 verified frames in this catalog.
- Will not fiterror · FrameSeatpost too big: Frame seat tube is 27.2mm but Seatpost is 30.9mm - a bigger post cannot fit a smaller tube. On 6 of the 258 verified frames in this catalog.
$25.00 MSRP·250 g
What the maker states1 stated
- 30.9 mm diameter.
Source: the maker’s page. Last checked 2026-07-23.
Checked against
The checker ran this model against every verified part below that it has a slot for, the same way it checks a build in the builder. What follows is the verdict it actually produced for that specific pairing — not a recommendation, and not a guarantee any of these parts fits your own bike.
- 5DEV R-SPEC Trail/Enduro Cranks (Crankset) No conflicts found
- 9point8 Fall Line (Dropper Post) No conflicts found
- 9point8 Stout (31.8, 30mm) (Stem) No conflicts found
- ACID SLX 30 front (Front Wheel) No conflicts found
- ACID SLX 30 rear (Rear Wheel) No conflicts found
- Acros ZS44/ZS56 (Headset) No conflicts found
6 of 1863 counterparts with a page of their own that the checker actually probed this model against, in alphabetical order by brand and model — never by price, popularity or the verdict itself.