Mason Exposure
Gravel · 8 sizes
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- Bike
- Mason Exposure · Gravel · 8 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) |
|---|---|---|---|---|---|---|---|---|
| 48CM | 536.1 | 359.9 | 69.5 | 74 | 100 | 435 | 1013 | 721 |
| 50CM | 550.2 | 360 | 69.5 | 74 | 115 | 435 | 1018.4 | 747 |
| 52CM | 566.2 | 370.6 | 70 | 74 | 130 | 435 | 1030 | 767 |
| 54CM | 578.3 | 375 | 70 | 73 | 145 | 435 | 1039.9 | 787 |
| 56CM | 589.8 | 379.9 | 70.5 | 73 | 155 | 435 | 1043.2 | 803 |
| 58CM | 604 | 392.9 | 71 | 72.5 | 170 | 435 | 1057.5 | 822 |
| 60CM | 627.7 | 395.9 | 71 | 72.5 | 195 | 435 | 1068.5 | 844 |
| 62CM | 644 | 403.6 | 71.5 | 72.5 | 210 | 435 | 1076.2 | 860 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 56CM 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 size48CM 70 x 400, 50CM 80 x 400, 52CM 90 x 420, 54CM 90 x 440, 56CM 100 x 440, 58CM 100 x 460, 60CM 110 x 460, 62CM 110 x 460 (stem length x bar width, mm)
Frame facts
read from the maker's words, not a table: masoncycles.cc- Tyre clearance
- 700c x 56 mm, 650b x 58 mm
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- yes
- Seatpost
- 27.2 mm round
- 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 · 83 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, 80, 90, 90, 100, 100, 110, 110 (48CM to 62CM) mm and its HANDLEBAR (OUTSIDE DIMENSION) row prints 40, 40, 42, 44, 44, 46, 46, 46 for 48CM to 62CM (cm, 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 Exposure Frameset ("Our Italian-made Dedacciai steel bikepacking and adventure bicycle". Source: html table (official Mason Cycles product page "Exposure Frameset", the "Full geometry chart" table in the page markup; fetched 2026-10-20
How I read the maker's table
the latest update brings UDH dropouts), eight sizes 48CM to 62CM, 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. STAND-OVER and the headline TRAIL row print the tyre beside each number: "721 [650 x 47]" on 48CM and "[650 x 55]" on 50CM to 62CM; the bracket was stripped and the number kept, so standover and trail on 48CM are for 650 x 47 and on the other sizes for 650 x 55 (wheel_size 650b; tyre_width_mm left null because it differs by size). The chart also prints trail per tyre: TRAIL: 650 x 47 74.7/74.7/71.5/71.5/68.2/65.1/65.1/61.9; TRAIL: 650 x 55 N/A/77.7/74.4/74.4/71.1/67.8/67.8/64.6; TRAIL: 650 x 2.35" N/A/79.9/76.5/76.5/73.2/69.9/69.9/66.6; TRAIL: 700 x 35 77.1/77.1/73.8/73.8/70.5/67.3/67.3/64.0; TRAIL: 700 x 50 N/A/82.2/78.7/78.7/75.3/71.9/71.9/68.6 (48CM to 62CM). stock_bar_width is the HANDLEBAR (OUTSIDE DIMENSION) row, printed in cm, converted to mm (42 -> 420) where one width is printed; it is the bar's OUTSIDE dimension as the maker labels it, not centre to centre. RIDER HEIGHT GUIDE cm 151-160 to 188-198; FORK WEIGHT RANGEFINDER AS 515g. Clearance: "650b x 58mm [2.35”] and 700c x 56mm tyres"; 27.2 mm seatpost; 44 mm head tube (EC44/ZS44). Model year: not printed on the page (model_year null). Bike Insights files Exposure versions 2026, 2025 and 2022.
Source: html table (official Mason Cycles product page "Exposure Frameset", the "Full geometry chart" table in the page markup; fetched 2026-10-20, HTTP 200)