Compare: 2022 Serk Titanium A21 650b wheels M vs 2025 Canyon Bicycles Grail CF SL 7.0 XS

Insights

Average stack and reach vs trend of all-road/gravel bikes

Design deviates from other sizes of Serk Titanium A21

Somewhat upright stack and reach vs trend of progressive gravel bikes

Stack	575mm	556mm -19mm
Reach	377mm	385mm +8mm
Stack to Reach Ratio	1.53:1	1.44:1
Seat Tube Length, C-T	510mm	—
Seat Tube Length, Unknown	—	450mm
Top Tube Length, Effective/Horizontal HT Top	549mm	—
Top Tube Length, Effective/Horizontal Unknown	—	550mm
Top Tube Slope	9.4deg	13.7deg +4.3deg
Head Tube Angle	70deg	71deg +1deg
Seat Tube Angle	73.5deg	73.5deg +0deg
Head Tube Length	139mm	129mm -10mm
Bottom Bracket Drop	75mm	75mm +0mm
Bottom Bracket Height	264mm	276mm +12mm
Chainstay Length	430mm	425mm -5mm
Chainstay Length Horizontal	423.4mm	418.3mm -5.1mm
Front-Center	612mm	610.3mm -1.7mm
Front-Center Horizontal	606.6mm	605.7mm -0.9mm
Wheelbase	1030mm	1024mm -6mm
Fork Offset/Rake	45mm	52.1mm +7.1mm
Trail	75.5mm high	65.8mm -9.7mm high
Mechanical Trail	70.9mm	62.2mm -8.7mm
Wheel Flop	24.3mm	20.3mm -4mm
Standover Height	—	766mm
Tire to Pedal Spindle	103mm 170 mm cranks	94.3mm -8.7mm 165 mm cranks
Pedal Spindle to Ground Clearance	94mm 170 mm cranks	111mm +17mm 165 mm cranks

Wheel Size	650B/27.5 in 584 mm BSD	700C/29 in 622 mm BSD
Tire Width	47mm	40mm -7mm
Tire Outer Diameter	678mm	702mm +24mm
Bike Length with Tires	1708mm	1726mm +18mm
Crank Length	—	165mm
Handlebar Width	—	420mm
Stem Length	—	60mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Titanium	Unknown
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc

Actions	Collection I've Ridden	Collection I've Ridden
Source	https://www.serk.cc/a21/	https://www.canyon.com/it-it/bici-gravel/race/grail/cf/grail-cf-7/4149.html
Brand	Serk Titanium	Canyon Bicycles
Bike	2022 A21 650b wheels	2025 Grail CF SL 7.0
Size	M	XS
Category	All-road/Gravel	Progressive Gravel