Trek Checkpoint AL
Gravel · 6 sizes
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- Bike
- Trek Checkpoint AL · Gravel · 6 sizes
- Geometry
- api.trekbikes.com, fetched 22 Oct 2026, re-checked, no differences
- Seat angle convention
- Calculated from Trek's table
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 10 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 · 879 bikes, 79 makes, 4,979 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) |
|---|---|---|---|---|---|---|---|---|
| 49 cm | 541 | 373 | 71.4 | 75 | 100 | 430 | 1005 | 723 |
| 52 cm | 561 | 376 | 71.7 | 74 | 120 | 430 | 1011 | 755 |
| 54 cm | 574 | 378 | 71.8 | 73.5 | 135 | 430 | 1018 | 775 |
| 56 cm | 590 | 380 | 72.2 | 73 | 150 | 430 | 1021 | 794 |
| 58 cm | 607 | 382 | 72.3 | 73 | 170 | 430 | 1028 | 816 |
| 61 cm | 637 | 386 | 72.6 | 73 | 200 | 430 | 1039 | 837 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 56 cm 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.
Frame facts
not read off the maker's page yet: api.trekbikes.com- Tyre clearance
- not recorded yet
- 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 api.trekbikes.com.Trek's sizing feed carries no bar or stem rows for the Checkpoint AL 4; no cockpit was read for this file.
Cockpit and seatpost, in the maker's words · 21 words
Trek's sizing feed carries no bar or stem rows for the Checkpoint AL 4; no cockpit was read for this file.
OFFICIAL SOURCE: Trek OCC sizing feed for code 24971 (product record URL /bikes/bikepacking-and-touring-bikes/checkpoint/checkpoint-al/checkpoint-al-4/a/24971/ and description "Checkpoint AL 4". Source: html table (official Trek OCC JSON that renders the "Sizing and fit" geometry table of the trekbikes.com product page
How I read the maker's table
the record's name field reads "Domane AL 4", a slip in Trek's data), category Checkpoint AL, geometry asset Geometry_14790_Road, six sizes 49, 52, 54, 56, 58, 61 cm, labels printed "49 cm" with a space. MODEL YEAR: the feed states none; the primary image is CheckpointAL4_19_24971 (introduced MY2019), the Internet Archive's capture list for Trek's US product page (https://www.trekbikes.com/us/en_US/bikes/road-bikes/gravel-bikes/checkpoint/checkpoint-al/checkpoint-al-4/p/24971/, CDX via tools/collect/archive.py, 22 Oct 2026) runs from August 2019 to April 2023, and Bike Insights files it as Checkpoint 2020 AL 4, so 2020 is recorded. The aluminium Checkpoint AL, a different frame and table from the Checkpoint ALR of the same years (trek-checkpoint-gen-1.json: 53 of 78 cells differ) and from Gen 2 (trek-checkpoint-gen-2.json). Bike Insights' entry also lists a 44 cm size that this feed does not print. UNITS: Trek publishes the table in centimetres to one decimal and angles in degrees; every length was multiplied by 10 to give millimetres (Decimal arithmetic, exact, no rounding). Column mapping from Trek's geometryDataHeaders: geometrySeattube -> seat_tube_length, geometryAngleSeattube -> seat_tube_angle, geometryLengthHeadtube -> head_tube_length, geometryAngleHead -> head_tube_angle, geometryEffToptube -> top_tube_effective, geometryBBDrop -> bb_drop, geometryLengthChainstay -> chainstay, geometryOffset -> fork_offset, geometryTrail -> trail, geometryWheelbase -> wheelbase, geometryStandover -> standover, geometryFrameReach -> reach, geometryFrameStack -> stack (Trek's frame stack and reach, so stack_datum head tube top). Front centre is not in this feed (null).
Source: html table (official Trek OCC JSON that renders the "Sizing and fit" geometry table of the trekbikes.com product page, https://api.trekbikes.com/occ/v2/gb/products/24971/sizing, Checkpoint AL 4; fetched 2026-10-22, HTTP 200)