Mason InSearchOf
Gravel · 5 sizes
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This is the bike I ride
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- Bike
- Mason InSearchOf · Gravel · 5 sizes
- Geometry
- masoncycles.cc, fetched 20 Oct 2026, re-checked, no differences
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 22 October 2026 · 686 bikes, 74 makes, 3,984 sizes in the catalogue
Geometry, every size, from the maker's table
The tinted row is the size drawn beside it. Press a size to draw it.| Size | Stack (mm) | Reach (mm) | Head angle (deg) | Seat angle (deg) | Head tube (mm) | Chainstay (mm) | Wheelbase (mm) | Standover (mm)not published |
|---|---|---|---|---|---|---|---|---|
| 42CM | 606 | 366.6 | 69 | 74 | 100 | 445 | 1062.1 | |
| 46CM | 614.4 | 375.7 | 69 | 74 | 110 | 445 | 1075 | |
| 50CM | 623.8 | 379.4 | 69 | 74 | 120 | 445 | 1082.3 | |
| 54CM | 633.1 | 384 | 69 | 74 | 130 | 445 | 1090.2 | |
| 58CM | 654.5 | 397.4 | 70 | 74 | 150 | 445 | 1101.3 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 50CM drawn to scale from the table, with no build on it. Stack and reach run from the bottom bracket to the top of the head tube; every size is solved from those two. One square is 100 mm.
The maker's cockpit
No stock cockpit I can name, so every size is solved on a generic stem and bar unless you choose one on the sheet.Generic stem and barAssumedNo bar is listed for this frame.
Stock stem and bar per size42CM 70 x 420, 46CM 70 x 440, 50CM 80 x 460, 54CM 90 x 460, 58CM 100 x 480 (stem length x bar width, mm)
Frame facts
read from the maker's words, not a table: masoncycles.cc- Tyre clearance
- 29 x 2.6 in, 650b x 2.9 in
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- not recorded yet
- Seatpost
- not recorded yet
- Frame weight
- not recorded yet
In the maker's words
Kept whole, as I read it off masoncycles.cc.No cockpit with the frameset; complete builds come with bars, stem and cranks "pre-set to match frame size".
Cockpit and seatpost, in the maker's words · 77 words
No cockpit with the frameset; complete builds come with bars, stem and cranks "pre-set to match frame size". The chart's STEM row prints stem lengths 70, 70, 80, 90, 100 (42CM to 58CM) mm and its HANDLEBAR (OUTSIDE DIMENSION) row prints 420, 440, 460, 460, 480 for 42CM to 58CM (mm, outside dimension). Two-piece bar and stem; the frameset comes with a Deda headset, expander bung and top cap; no bar is named on the frameset page.
OFFICIAL SOURCE: Mason Cycles product page for the ISO 2 Frameset (URL insearchof-frameset. Source: html table (official Mason Cycles product page "ISO 2 Frameset", the "Full geometry chart" table in the page markup; fetched 2026-10-20
How I read the maker's table
"The updated ISO2 is a progressive frame and fork with a design allowing use of 29 x 2.6” or 650b x 2.8" wheels"), five sizes 42CM to 58CM, labels as printed. Some angle cells carry a degree sign in the markup (71.5º), stripped by the parser. Stack datum: the page's geometry diagram (/media/images/diagram-geometry.png, read for the datum only, not stored) draws stack and reach to the head tube top; no headset cover height is given. This chart has no single STAND-OVER row: it prints "S/O - 27.5 x 2.8 (Measured vertically, 50mm in front of BB centre)" 74.0/76.5/79.0/82.5/86.5 and "S/O - 29 x 2.4 (...)" 76.0/78.5/81.0/84.5/88.5, with no unit (they read as centimetres), so standover is null and both rows are kept here. The headline TRAIL row equals the TRAIL: 29 x 2.4" row (89.6 x4, 82.6), so the trail is for 29 x 2.4 in tyres (wheel_size 700c is the 29 in / 622 rim; tyre_width_mm null). stock_bar_width is the HANDLEBAR (OUTSIDE DIMENSION) row as printed (mm); it is the bar's OUTSIDE dimension as the maker labels it, not centre to centre. FORK CROWN HEIGHT 483 (100 mm suspension-corrected, HotShoe2 fork); AXLE SPACING 148; frame weights 2100g to 2480g; RIDER HEIGHT GUIDE cm 151-163 to 188-198. Clearance: "29" or 27.5" wheels - max tyre width: 29 x 2.6” or 27.5 x 2.9”". Model year: not printed on the page (model_year null). Bike Insights files this frame as "ISO 2" (2025) and the earlier frame as "InSearchOf" (2022, 2021, 2019).
Source: html table (official Mason Cycles product page "ISO 2 Frameset", the "Full geometry chart" table in the page markup; fetched 2026-10-20, HTTP 200)