Cannondale Synapse 1

An all-round road bike from 2025, made in 7 sizes from 44 to 61.

Size

Stack 570 mmReach 381 mm

Geometry

Cannondale Synapse 1 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	510	530	550	570	590	610	640
Reach (mm)How far forward the bars start	365	371	376	381	387	393	402
Stack ÷ reach Higher = more upright	1.40	1.43	1.46	1.50	1.52	1.55	1.59
Top tube (effective) (mm)Horizontal top-tube length	521	533	544	555	567	580	598
Seat tube angle Saddle position over the pedals	73°	73°	73°	73°	73°	73°	73°
Seat tube length (mm)Frame size reference	400	422	443	480	520	550	590
Head tube length (mm)Front-end height	96	115	140	160	181	205	236
Standover (mm)Clearance when you stop	681	702	723	753	784	810	845
Handling
Head tube angle Steeper = quicker steering	70.2°	70.8°	71°	71.9°	72°	72°	72°
Fork offset (mm)Fork rake	55	55	55	55	55	55	55
Trail (mm)More = steadier steering	65	61	60	54	54	54	54
Wheelbase (mm)Longer = more stable	985	993	1006	1010	1021	1035	1054
Chainstay (mm)Shorter = snappier	415	415	415	415	415	415	415
BB drop (mm)More = lower centre of gravity	80	80	75	73	73	70	70
BB height (mm)Pedal clearance in corners	256	256	261	263	263	266	266
Front centre (mm)Room for your toes	584	591	602	606	617	630	649

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

Between race and comfort. A good fit for sportives, club rides and fast days out.

Size 54 is more upright than 78% of the 218 road frames we track.

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

Bikes with a similar fit, compared with size 54 of this bike
Bike	Size	Stack	Reach
Bianchi Infinito XE 105 Di22025Stack −1 mm, reach same	55	−1 mm	same
Grind Grit2026Stack +1 mm, reach −3 mm	M	+1 mm	−3 mm
Basso Venta R2026Stack +1 mm, reach same	53	+1 mm	same
Bmc Roadmachine TWO2026Stack same, reach +2 mm	54	same	+2 mm
Giant Contend AR 12026Stack +4 mm, reach −1 mm	M	+4 mm	−1 mm
Kross VENTO DSC 8.02025Stack −6 mm, reach same	M	−6 mm	same