Specialized Crux Expert X1

An all-road gravel bike from 2018, made in 7 sizes from 46cm to 61cm.

Size

Stack 566 mmReach 382 mm

Geometry

Specialized Crux Expert X1 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	523	540	554	566	582	597	618
Reach (mm)How far forward the bars start	366	369	375	382	388	395	402
Stack ÷ reach Higher = more upright	1.43	1.46	1.48	1.48	1.50	1.51	1.54
Top tube (effective) (mm)Horizontal top-tube length	531	534	541	550	555	549	562
Seat tube angle Saddle position over the pedals	72.5°	73°	73.3°	73.5°	74°	75.5°	75.5°
Seat tube length (mm)Frame size reference	470	490	510	530	550	570	600
Head tube length (mm)Front-end height	100	115	125	140	155	170	190
Standover (mm)Clearance when you stop	764	782	795	809	825	841	862
Handling
Head tube angle Steeper = quicker steering	69.5°	70.5°	71.5°	71.5°	72°	72.5°	73°
Fork offset (mm)Fork rake	50	50	50	50	50	50	50
Trail (mm)More = steadier steering	55	59	62	65	65	72	78
Wheelbase (mm)Longer = more stable	1007	1007	1008	1020	1026	1034	1043
Chainstay (mm)Shorter = snappier	425	425	425	425	425	425	425
BB drop (mm)More = lower centre of gravity	67	67	69	69	71	71	71
BB height (mm)Pedal clearance in corners	269	269	267	267	265	265	265
Front centre (mm)Room for your toes	592	592	593	605	611	618	627

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 54cm is more upright than 55% of the 106 gravel frames we track.

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

Bikes with a similar fit, compared with size 54cm of this bike
Bike	Size	Stack	Reach
Trek Checkpoint ALR 3 Gen 32026Stack same, reach +3 mm	SM	same	+3 mm
MMR X-Tour 002026Stack +3 mm, reach −2 mm	M	+3 mm	−2 mm
Giant Revolt Advanced 12024Stack +4 mm, reach −1 mm	S	+4 mm	−1 mm
Scott Addict Gravel 402025Stack −1 mm, reach +5 mm	M	−1 mm	+5 mm
Cervelo R5-CX2026Stack −6 mm, reach +7 mm	56	−6 mm	+7 mm
Marin Gestalt 12025Stack +2 mm, reach −10 mm	52	+2 mm	−10 mm