Cannondale Synapse 105

An all-round road bike from 2023, made in 6 sizes from 48 to 61.

Size

Stack 570 mmReach 383 mm

Geometry

Cannondale Synapse 105 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	530	550	570	589	609	639
Reach (mm)How far forward the bars start	371	376	383	389	394	403
Stack ÷ reach Higher = more upright	1.43	1.46	1.49	1.51	1.55	1.59
Top tube (effective) (mm)Horizontal top-tube length	517	531	548	563	580	604
Seat tube angle Saddle position over the pedals	74.6°	74.3°	73.9°	73.5°	73°	72.5°
Seat tube length (mm)Frame size reference	422	443	480	520	550	590
Head tube length (mm)Front-end height	123	143	159	178	202	232
Standover (mm)Clearance when you stop	701	722	755	787	816	851
Handling
Head tube angle Steeper = quicker steering	70.8°	71°	71.9°	72.1°	72.3°	72.5°
Fork offset (mm)Fork rake	60	60	50	50	50	50
Trail (mm)More = steadier steering	57	55	60	59	58	56
Wheelbase (mm)Longer = more stable	999	1010	1004	1014	1025	1041
Chainstay (mm)Shorter = snappier	413	413	413	413	413	413
BB drop (mm)More = lower centre of gravity	75	75	73	73	70	70
BB height (mm)Pedal clearance in corners	261	261	263	263	266	266
Front centre (mm)Room for your toes	598	608	602	612	622	638

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 70% 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
Bmc Roadmachine TWO2026Stack same, reach same	54	same	same
Bianchi Infinito XE 105 Di22025Stack −1 mm, reach −2 mm	55	−1 mm	−2 mm
Basso Venta R2026Stack +1 mm, reach −2 mm	53	+1 mm	−2 mm
Giant Contend AR 12026Stack +4 mm, reach −3 mm	M	+4 mm	−3 mm
Grind Grit2026Stack +1 mm, reach −5 mm	M	+1 mm	−5 mm
Canyon Endurace:ONfly CF 82025Stack −2 mm, reach +2 mm	S	−2 mm	+2 mm

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

1 more