Trek Checkpoint ALR 4 Bike

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.

*spec applies to all sizes unless otherwise noted

Frameset

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

Wheels

Hub front	Bontrager alloy, sealed bearing, centerlock disc, 100x12mm thru axle
Skewer front	100x12mm thru axle
Hub rear	Bontrager alloy, sealed bearing, centerlock disc, Shimano 11-speed freehub, 142x12mm thru axle
Skewer rear	142x12mm thru axle, 174mm length
Rim	Bontrager Tubeless Ready, 28-hole, 17mm width, presta valve
Spokes	14g stainless steel
Tire	Bontrager GR1 Comp, wire bead, 60 tpi, 700x40c
Max tire size	45c Bontrager tires (49 & 52cm: 40c due to toe overlap), with at least 4mm of clearance to frame

Drivetrain

Shifter	Shimano GRX RX400, 10 speed
Front derailleur	Shimano GRX RX400, braze-on
Rear derailleur	Shimano GRX RX400, long cage, 36T max cog
*Crank	Size: 49 Shimano GRX RX600, 46/30, 165mm length
	Size: 52 Shimano GRX RX600, 46/30, 170mm length
	Size: 54, 56 Shimano GRX RX600, 46/30, 172.5mm length
	Size: 58, 61 Shimano GRX RX600, 46/30, 175mm length
Bottom bracket	Shimano RS500, 86mm, PressFit
Cassette	Shimano Tiagra HG500, 11-34, 10 speed
Chain	KMC X10

Components

Saddle	Bontrager Montrose Comp, steel rails, 138mm width
Seatpost	Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length
*Handlebar	Size: 49 Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 38cm width
	Size: 52 Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 40cm width
	Size: 54, 56 Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 42cm width
	Size: 58, 61 Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 44cm width
Handlebar tape	Bontrager Supertack Perf tape
*Stem	Size: 49 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 80mm length
	Size: 52, 54 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length
	Size: 56, 58 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 100mm length
	Size: 61 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 110mm length
Headset	FSA Integrated, sealed cartridge bearing, 1-1/8” top, 1.5” bottom
Brake	Shimano RX400 hydraulic disc, flat mount
Brake rotor	Shimano SM-RT70, centerlock, 160mm

Weight

Weight	56 – 10.26 kg / 22.62 lbs
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 275 pounds (125 kg).

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

156.0 – 162.0 cm

5’1.4″ – 5’3.8″

74.0 – 77.0 cm

29.1″ – 30.3″

163.0 – 168.0 cm

5’4.2″ – 5’6.1″

76.0 – 79.0 cm

29.9″ – 31.1″

168.0 – 174.0 cm

5’6.1″ – 5’8.5″

78.0 – 82.0 cm

30.7″ – 32.3″

174.0 – 180.0 cm

5’8.5″ – 5’10.9″

81.0 – 85.0 cm

31.9″ – 33.5″

180.0 – 185.0 cm

5’10.9″ – 6’0.8″

84.0 – 87.0 cm

33.1″ – 34.3″

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