Trek Checkpoint ALR 4

An all-road gravel bike from 2021, made in 6 sizes from 49 to 61.

Size

Stack 567 mmReach 383 mm

Geometry

Trek Checkpoint ALR 4 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	532	549	567	586	609	638
Reach (mm)How far forward the bars start	373	379	383	387	391	397
Stack ÷ reach Higher = more upright	1.43	1.45	1.48	1.51	1.56	1.61
Top tube (effective) (mm)Horizontal top-tube length	515	536	551	566	577	592
Seat tube angle Saddle position over the pedals	75°	74°	73.5°	73°	73°	73°
Seat tube length (mm)Frame size reference	490	520	540	560	580	610
Head tube length (mm)Front-end height	90	107	126	145	171	200
Standover (mm)Clearance when you stop	749	770	789	808	829	858
Handling
Head tube angle Steeper = quicker steering	71.4°	71.6°	71.8°	72.2°	72.3°	72.6°
Fork offset (mm)Fork rake	49	49	49	49	49	49
Trail (mm)More = steadier steering	66	65	64	61	61	59
Wheelbase (mm)Longer = more stable	995	1005	1014	1020	1032	1044
Chainstay (mm)Shorter = snappier	425	425	425	425	425	425
BB drop (mm)More = lower centre of gravity	78	78	76	76	74	74
BB height (mm)Pedal clearance in corners	258	258	260	260	262	262
Front centre (mm)Room for your toes	582	592	601	607	618	630

Underlined values are calculated by BikeLens. A dash means the brand doesn't publish it.

Quick enough for spirited riding, comfortable enough for long days on mixed terrain.

Size 54 is more upright than 54% of the 106 gravel frames we track.

The closest gravel frames from other ranges, against size 54 here.

Bikes with a similar fit, compared with size 54 of this bike
Bike	Size	Stack	Reach
Specialized Crux Comp2021Stack −1 mm, reach −1 mm	54	−1 mm	−1 mm
MMR X-Grip-302026Stack −2 mm, reach −8 mm	M	−2 mm	−8 mm
MMR X-Grip 002026Stack −2 mm, reach −8 mm	M	−2 mm	−8 mm
Giant Revolt Advanced 12024Stack +3 mm, reach −2 mm	S	+3 mm	−2 mm
Scott Addict Gravel 402025Stack −2 mm, reach +4 mm	M	−2 mm	+4 mm
Scott Speedster Gravel 202025Stack +3 mm, reach +4 mm	M/54	+3 mm	+4 mm

These builds share this exact geometry, so they fit the same.