Giant Defy Advanced 1

An all-round road bike from 2026, made in 5 sizes from S to XL. Fits tyres up to 40 mm.

Size

Stack 577 mmReach 384 mm

Geometry

Giant Defy Advanced 1 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	541	558	577	596	615
Reach (mm)How far forward the bars start	375	380	384	393	402
Stack ÷ reach Higher = more upright	1.44	1.47	1.50	1.52	1.53
Top tube (effective) (mm)Horizontal top-tube length	530	545	560	575	595
Seat tube angle Saddle position over the pedals	74°	73.5°	73°	73°	73°
Seat tube length (mm)Frame size reference	445	480	515	535	565
Head tube length (mm)Front-end height	135	150	175	195	215
Standover (mm)Clearance when you stop	733	762	796	814	841
Handling
Head tube angle Steeper = quicker steering	71.8°	72.5°	72.5°	72.5°	72.5°
Fork offset (mm)Fork rake	50	50	50	50	50
Trail (mm)More = steadier steering	63	59	59	59	59
Wheelbase (mm)Longer = more stable	994	998	1010	1025	1040
Chainstay (mm)Shorter = snappier	420	420	420	420	420
BB drop (mm)More = lower centre of gravity	75	75	70	70	70
BB height (mm)Pedal clearance in corners	261	261	266	266	266
Front centre (mm)Room for your toes	586	590	600	615	630
Other
Weight (kg)Complete bike, as published	–	–	8.6	–	–

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 ML is more upright than 79% of the 218 road frames we track.

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

Bikes with a similar fit, compared with size ML of this bike
Bike	Size	Stack	Reach
Kross VENTO DSC 5.02026Stack −3 mm, reach same	M	−3 mm	same
Basso Astra2026Stack −1 mm, reach −4 mm	53	−1 mm	−4 mm
MMR Grip 002026Stack +3 mm, reach +6 mm	L	+3 mm	+6 mm
Basso Venta R2026Stack −6 mm, reach −3 mm	53	−6 mm	−3 mm
Cervelo Caledonia2026Stack +3 mm, reach +3 mm	56	+3 mm	+3 mm
Bianchi Infinito Ultegra DI22026Stack +8 mm, reach +2 mm	57	+8 mm	+2 mm