Mason InSearchOf Frame
Lifecycle status:
- InSearchOf (2023): The catalog records this variant as discontinued. Recorded successor: Mason ISO 2.
What the checker says343will not fit124worth knowing
Run variant by variant through the gravel 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 807 verified gravel bike parts in this catalog. 571 produced no finding of any kind; that is InSearchOf (2023). ISO 2 (2025) clears 566. Each variant produces 170 to 173 distinct errors and 0 distinct warnings.
Will not fit
- Will not fiterror · Dropper PostDropper too small: Mason ISO 2's seat tube is 31.6mm but Wolf Tooth Resolve is 30.9mm. A shim or adapter may make other sizes or standards work, but that is a modification, not a fit. On 4 of the 40 verified dropper posts in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Dropper PostDropper too small: Mason InSearchOf's seat tube is 31.6mm but Wolf Tooth Resolve is 30.9mm. A shim or adapter may make other sizes or standards work, but that is a modification, not a fit. On 4 of the 40 verified dropper posts in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear WheelRear axle mismatch: Mason ISO 2 takes a 12x148 hub but Spank Flare 24 OC Vibrocore Rear Wheel (SRAM XDR) is 12x142. On 2 of the 71 verified rear wheels in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear WheelRear axle mismatch: Mason ISO 2 takes a 12x148 hub but Spank Flare 24 OC Vibrocore Rear Wheel (Shimano HG-Road) is 12x142. On 2 of the 71 verified rear wheels in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear WheelRear axle mismatch: Mason InSearchOf takes a 12x148 hub but Spank Flare 24 OC Vibrocore Rear Wheel (SRAM XDR) is 12x142. On 2 of the 71 verified rear wheels in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear WheelRear axle mismatch: Mason InSearchOf takes a 12x148 hub but Spank Flare 24 OC Vibrocore Rear Wheel (Shimano HG-Road) is 12x142. On 2 of the 71 verified rear wheels in this catalog. Applies to 1 of 2 variants.
Rg rear axle, Rear Wheel. 130 more findings from the same check, on up to 1 of the 71 verified rear wheels each.
Rg bb shell, Bottom Bracket. 53 more findings from the same check, on up to 1 of the 30 verified bottom brackets each.
Rg seatpost, Seatpost. 52 more findings from the same check, on up to 1 of the 33 verified seatposts each.
Rg seatpost, Dropper Post. 48 more findings from the same check, on up to 1 of the 40 verified dropper posts each.
Rg brake mount, Rear Caliper. 22 more findings from the same check, on up to 1 of the 27 verified calipers each.
Rg fd mount, Front Derailleur. 22 more findings from the same check, on up to 1 of the 11 verified front derailleurs each.
Rg steerer, Fork. 10 more findings from the same check, on up to 1 of the 31 verified forks each.
Open a variant in the builder to see the ones that apply to your own parts.
Worth knowing
Rg bb advisory, Crankset. 66 more findings from the same check, on up to 1 of the 33 verified cranksets each.
Rg headset advisory, Fork. 52 more findings from the same check, on up to 2 of the 31 verified forks each.
Rg xplr udh, Rear Derailleur. 6 more findings from the same check, on up to 1 of the 20 verified rear derailleurs each.
Open a variant in the builder to see the ones that apply to your own parts.
$2,387.00 to $2,600.00 MSRP·1450 to 2100 g
What the maker states
- Rear axle
- 12x148
- Bottom bracket
- Bottom-bracket shell bsa-road (on 1 of 2 variants); Bottom-bracket shell t47-73 (on 1 of 2 variants)
- Seatpost
- Takes a 31.6 mm seatpost
- Wheel sizes
- Built for 700c and 650b wheels
- Brake system
- Disc-flat
- Brake mount
- Flat-mount
A value shown as a set or a range differs between this model’s variants and is never one variant’s spec.
2 verified variants
| Variant | Bottom bracket | Steerer | Maximum tire by wheel | Price (MSRP) | Weight | Source | Last checked | Build |
|---|---|---|---|---|---|---|---|---|
| InSearchOf (2023) | Bottom-bracket shell bsa-road | Tapered 1.125-1.5 | Tire up to 63.5 mm on 700c and 71.1 mm on 650b (maker-stated maximum) | $2,600.00 | 1450 g | maker’s page | 2026-09-19 | Build with this |
| ISO 2 (2025) | Bottom-bracket shell t47-73 | Tapered (1.5-1.125) | Tire up to 64 mm on 700c and 74 mm on 650b (maker-stated maximum) | $2,387.00 | 2100 g | maker’s page | 2026-07-23 | Build with this |
The rest of what the maker states5 stated·16 not published
- Front-derailleur mount none.
- Steel construction.
- Steerer Tapered (1.5-1.125) (on 1 of 2 variants); Steerer Tapered 1.125-1.5 (on 1 of 2 variants).
- Tire up to 63.5 mm on 700c and 71.1 mm on 650b (maker-stated maximum) (on 1 of 2 variants); Tire up to 64 mm on 700c and 74 mm on 650b (maker-stated maximum) (on 1 of 2 variants).
- Sold as a frameset, not a bare frame (on 1 of 2 variants); Sold as a frame only (on 1 of 2 variants).
16 further fields the checker looks for are not published by Mason, so we leave them blank rather than estimate them, and those 16 checks stay silent on this frame. They are maximum tire basis, maximum rear rotor, minimum rear rotor, head tube upper, head tube lower, headset included, headset included model, headset included part, maximum fork travel, minimum fork travel, design fork travel, fork travel hard, dropout type, udh, drive mode and gearbox mount. Each is recorded as “not stated by the maker (not checked)”.
Source: each variant links the maker’s own page in the table above. Last checked 2026-07-23 to 2026-09-19.
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.
- 3T Fango LTD (Fork) Worth knowing
- 8bar Gravel Carbon Disc Fork v2 (Fork) Worth knowing
- 9point8 Fall Line R (Dropper Post) Will not fit
- Acros ZS44/28.6 | EC44/40 Headset (Headset) No conflicts found
- BikeYoke Divine SL Rascal (Dropper Post) Will not fit
- BMC URS 01 D-Shaped Seatpost (Seatpost) Will not fit
6 of 455 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.