Trek Checkpoint AL 4

An all-road gravel bike from 2019, made in 7 sizes from 44 to 61. Fits tyres up to 38 mm.

Size

Stack 574 mmReach 378 mm

Geometry

Trek Checkpoint AL 4 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	531	541	561	574	590	607	637
Reach (mm)How far forward the bars start	368	373	376	378	380	382	386
Stack ÷ reach Higher = more upright	1.44	1.45	1.49	1.52	1.55	1.59	1.65
Top tube (effective) (mm)Horizontal top-tube length	505	518	537	548	560	568	581
Seat tube angle Saddle position over the pedals	75.5°	75°	74°	73.5°	73°	73°	73°
Seat tube length (mm)Frame size reference	390	440	475	500	525	548	567
Head tube length (mm)Front-end height	90	100	120	135	150	170	200
Standover (mm)Clearance when you stop	685	723	755	775	794	816	837
Handling
Head tube angle Steeper = quicker steering	70.6°	71.4°	71.7°	71.8°	72.2°	72.3°	72.6°
Fork offset (mm)Fork rake	50	51	50	50	50	50	51
Trail (mm)More = steadier steering	72	66	63	64	61	61	59
Wheelbase (mm)Longer = more stable	1002	1005	1011	1018	1021	1028	1039
Chainstay (mm)Shorter = snappier	430	430	430	430	430	430	430
BB drop (mm)More = lower centre of gravity	80	78	78	76	76	74	74
BB height (mm)Pedal clearance in corners	256	258	258	260	260	262	262
Front centre (mm)Room for your toes	585	587	593	600	603	609	620

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 79% 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
Marin Gestalt 12019Stack +1 mm, reach −3 mm	54	+1 mm	−3 mm
Specialized Crux E5 Sport2019Stack −8 mm, reach +1 mm	54	−8 mm	+1 mm
Megamo JAKAR 202026Stack −4 mm, reach −2 mm	M	−4 mm	−2 mm
MMR X-Grip-302026Stack −9 mm, reach −3 mm	M	−9 mm	−3 mm
MMR X-Grip 002026Stack −9 mm, reach −3 mm	M	−9 mm	−3 mm
Giant Revolt Advanced 12024Stack −4 mm, reach +3 mm	S	−4 mm	+3 mm

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