Compare: 2017 Ridley Bikes Helium X Base XXS vs 2023 BXT BX-Road-145 Pro-145 47

Insights

Somewhat aggressive stack and reach vs trend of performance road bikes

Design deviates from other sizes of Ridley Bikes Helium X

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of BXT BX-Road-145

Stack	507mm	508.4mm +1.4mm
Reach	379mm	372mm -7mm
Stack to Reach Ratio	1.34:1	1.37:1
Seat Tube Length, C-T	450mm	450mm +0mm
Seat Tube Length, C-C	410mm	—
Top Tube Length, Effective/Horizontal Center	515mm	512mm -3mm
Top Tube Length, Actual C-C	501mm	—
Top Tube Slope	8.2deg	8.6deg +0.4deg
Head Tube Angle	71.8deg	72.1deg +0.3deg
Seat Tube Angle	75deg	74.6deg -0.4deg
Head Tube Length	107mm	100mm -7mm
Bottom Bracket Drop	68mm	70mm +2mm
Bottom Bracket Height	268mm	269mm +1mm
Chainstay Length	405mm	410mm +5mm
Chainstay Length Horizontal	399.3mm	404mm +4.7mm
Front-Center	574.8mm	565.2mm -9.6mm
Front-Center Horizontal	570.8mm	560.8mm -10mm
Wheelbase	970mm	964.8mm -5.2mm
Fork Offset/Rake	45mm	45mm +0mm
Fork Length (Axle-To-Crown)	—	375mm
Trail	63.1mm mid/neutral	62.2mm -0.9mm mid/neutral
Mechanical Trail	59.9mm	59.2mm -0.7mm
Wheel Flop	18.7mm	18.2mm -0.5mm
Tire to Pedal Spindle	68.8mm 170 mm cranks	56.2mm -12.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	98mm 170 mm cranks	99mm +1mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	25mm	28mm +3mm
Tire Outer Diameter	672mm	678mm +6mm
Bike Length with Tires	1642mm	1642.8mm +0.8mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Rim	Disc

Actions	Collection I've Ridden	Collection I've Ridden
Source	ridley	https://www.bxtcycle.com/bxt-road-145_p75.html
Brand	Ridley Bikes	BXT
Bike	2017 Helium X Base	2023 BX-Road-145 Pro-145
Size	XXS	47
Category	Performance Road	Performance Road