Last updated on August 5, 2022 9:01 am

Checkpoint ALR 4 2021

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Checkpoint ALR 4 is an aluminum gravel bike that offers an incredible amount of capability for the price. It’s built for the rigors of gravel and dirt roads, but it’s also right at home on morning commutes and centuries. This bike knows no boundaries, which makes it the ideal gateway to adventure on any road or path.

Checkpoint ALR 4: Outstanding Value in an All-Terrain Bike

The prestigious Checkpoint ALR 4 2021 is a lightweight, gravel-loving, go-anywhere aluminum bike that will draw stares of envy from other serious cyclers. It’s super-sturdy, yet weighs less than 23 pounds. Undefeated by any type of weather, it will meet any challenge from urban commuting to trekking in the wilderness.

A versatile model for the adventurous biker

Come rain or come shine, come snow or come sleet, this bike is at home on

gravel, dirt, asphalt and cement. Enormous tire clearance accommodates tires up to 45c. Wide, gravel-specific tires provide superb traction and a stable ride. The drivetrain offers extra low gears for conquering hills and slippery terrain.

Checkpoint ALR 4 2021

Cutting-edge stopping power

This Checkpoint features the latest in hydraulic disc technology to stop you reliably no matter the weather. Flat-mount brakes are smaller, lighter, and neater than traditional disc brakes.

Awesome features at a bargain price

Despite its speed, this model offers a comfortable ride, with a premium-quality saddle and a carbon fork to insulate your hands and arms from road vibration. Trekkers and commuters will appreciate the rack and the three mounts on the seat and downtube. Tech fans will love the horizontal sliding dropout, which permits single-speed riding and allows you to easily customize your geometry.

Tubeless wheel system

A fully integrated tubeless system, Bontrager TLR (tubeless-ready) technology lets you ride on lower tire pressure without risking more flats. The result: greater security and a cushier ride.

Built for lasting performance

Top-grade aluminum provides an optimal degree of stiffness with minimal weight.

  • 300 Series Alpha aluminum frame
  • Custom-shaped tubes and minimal welds
  • 2×10 Shimano GRX drivetrain
  • Lightweight fork with carbon legs for a smooth ride
  • 700x40c gravel-specific tires for outstanding traction
  • Ultra-modern, flat-mount hydraulic disc brakes
  • 138 mm Bontrager Montrose Comp saddle

Trek Checkpoint

Do you like having fun? Ride like a kid again. Checkpoint is the gravel bike that takes you on any

Aluminum Gravel Machine - 2021 Checkpoint ALR 4 GRX 10 Speed Gravel Road Bike Review and Weight

The new Trek Checkpoint ALR 5 is a very exciting new gravel bike. It uses the awesome and versatile Trek Checkpoint ALR Frameset and adds a 2x10 Shimano GRX RX400 drivetrain.

Trek Checkpoint Review! - ALR 4 - Best Gravel Bike Line?

I purchased my Trek Checkpoint ALR 4 last August after selling my Trek Domane.


Specification: Checkpoint ALR 4 2021


Trek Bikes



Checkpoint carbon, tapered alloy steerer, rack & fender mounts, flat mount disc, 12x100mm thru axle


Bontrager Tubeless Ready, 28-hole, 17mm width, presta valve


14g Stainless Steel


Bontrager GR1 Comp, wire bead, 60 tpi, 700x40c


Shimano GRX RX400, 10 speed

Front derailleur

Shimano GRX RX400, braze-on

Rear derailleur

Shimano GRX RX400, long cage, 36T max cog


Shimano GRX RX600

Bottom Bracket

Shimano RS500, 86mm, PressFit


Shimano Tiagra HG500, 11-34, 10 speed




Bontrager Montrose Comp, steel rails, 138mm width


Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length


Bontrager Elite IsoZone VR-CF

Handlebar tape

Bontrager Supertack Perf tape


Bontrager Elite


FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom


Shimano RX400 hydraulic disc, flat mount

Brake rotors

Shimano SM-RT70, centerlock, 160mm


56 – 10.26 kg / 22.62 lbs

Weight limit

125kg (275lbs)


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