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It's right for you if...
You hear words like "gravel" and "grit" and think, "Bring it on." You want to build up a single durable, ultra-versatile gravel bike that's ready for any adventure, including bikepacking, gravel races, and commuting.
The tech you get
A 300 Series Alpha Aluminum frame with massive tire clearance, Checkpoint carbon disc fork, rack and fender mounts, and a cartridge-bearing headset. Built for 12mm thru axles, flat-mount disc brakes, and BB86.5 bottom bracket.
The final word
Build your gravel bike exactly the way you want. Checkpoint ALR Frameset gives you a solid head start on your dream build with a lightweight frame, carbon fork, and gravel-specific details like extra mounts for endless customization options.
The Walkthrough
favorite_borderWhy you'll love it
- This bike is exceedingly versatile and suited to a wide variety of ride styles, including gravel rides, bikepacking, and daily commutes
- Massive tire clearance means you can use tires up to 45c for extra traction and stability in any conditions
- Mounts on the seat tube and both sides of the down tube make it easy to carry extra gear and water
- Internal cable routing with Control Freak Cable Management keeps things smooth, quiet, and clean
- Horizontal sliding dropouts make it easy to fine-tune your geometry or build it up as a singlespeed
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Features
300 Series Alpha Aluminum
Trek’s premium-grade aluminum is hydroformed into size-specific tubes that provide the perfect balance of stiffness and weight.
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Carbon fork
Lightweight fork with carbon fiber legs soaks up hand-numbing road vibration.
Flat Mount disc brakes
All-new Flat Mount disc brakes are more elegant, lighter, smaller, and cleaner than traditional disc brakes, providing superior performance and stopping power under harsh conditions.
Horizontal Sliding Dropout
Horizontal sliding dropout with redundant securing mechanisms allows for no-slip singlespeed or geared options and provides the ability to dial in the geometry to match each rider’s style.
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Specifications
*spec applies to all sizes unless otherwise noted
| Frame | 300 Series Alpha Aluminum, tapered head tube, Control Freak internal routing, 3S chain keeper, rack and fender mounts, flat mount disc, horizontal sliding dropouts, 142x12mm thru axle |
|---|---|
| Fork | Checkpoint carbon, tapered alloy steerer, rack mounts, fender mounts, flat mount disc, 12x100mm thru axle |
| Frame fit | Gravel |
| Skewer front | Bontrager Switch thru axle, removable lever |
|---|---|
| Skewer rear | Bontrager Switch thru axle, removable lever |
| Max tire size | 45c Bontrager tires (49 & 52cm: 40c due to toe overlap), with at least 4mm of clearance to frame |
| Max chainring size | 50/34 |
|---|
| Headset | FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom |
|---|
| Weight | 56 - 2.48 kg / 5.47 lbs |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 275 pounds (125 kg). |
Sizing & Tech
The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local retailer.
Rider Height
Inseam
49
156.0 - 162.0 cm
5'1.4" - 5'3.8"
74.0 - 77.0 cm
29.1" - 30.3"
52
163.0 - 168.0 cm
5'4.2" - 5'6.1"
76.0 - 79.0 cm
29.9" - 31.1"
54
168.0 - 174.0 cm
5'6.1" - 5'8.5"
78.0 - 82.0 cm
30.7" - 32.3"
56
174.0 - 180.0 cm
5'8.5" - 5'10.9"
81.0 - 85.0 cm
31.9" - 33.5"
58
180.0 - 185.0 cm
5'10.9" - 6'0.8"
84.0 - 87.0 cm
33.1" - 34.3"
61
185.0 - 191.0 cm
6'0.8" - 6'3.2"
86.0 - 90.0 cm
33.9" - 35.4"
All measurements provided in cm unless otherwise noted.
| Frame size number | Wheel size | A — Seat tube | B — Seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 49 cm | 700c | 49.0 | 75.0° | 9.0 | 71.4° | 51.5 | 7.8 | 42.5 | 4.9 | 6.6 | 99.5 | 74.9 | 37.3 | 53.2 |
| 52 cm | 700c | 52.0 | 74.0° | 10.7 | 71.6° | 53.6 | 7.8 | 42.5 | 4.9 | 6.5 | 100.5 | 77.0 | 37.9 | 54.9 |
| 54 cm | 700c | 54.0 | 73.5° | 12.6 | 71.8° | 55.1 | 7.6 | 42.5 | 4.9 | 6.4 | 101.4 | 78.9 | 38.3 | 56.7 |
| 56 cm | 700c | 56.0 | 73.0° | 14.5 | 72.2° | 56.6 | 7.6 | 42.5 | 4.9 | 6.1 | 102.0 | 80.8 | 38.7 | 58.6 |
| 58 cm | 700c | 58.0 | 73.0° | 17.1 | 72.3° | 57.7 | 7.4 | 42.5 | 4.9 | 6.1 | 103.2 | 82.9 | 39.1 | 60.9 |
| 61 cm | 700c | 61.0 | 73.0° | 20.0 | 72.6° | 59.2 | 7.4 | 42.5 | 4.9 | 5.9 | 104.4 | 85.8 | 39.7 | 63.8 |