Compare: 2018 DENGFU R01 Ultralight 52cm vs 2026 SPect MIRA Base 51

Insights

Somewhat aggressive stack and reach vs trend of performance road bikes

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of SPect MIRA

Bar type unusual for category

This: Aero Bar
Category: Drop Bar

Stack	523.5mm	519mm -4.5mm
Reach	384mm	376mm -8mm
Stack to Reach Ratio	1.36:1	1.38:1
Seat Tube Length, C-T	505mm	—
Seat Tube Length, C-C	460mm	—
Top Tube Length, Effective/Horizontal Center	535mm	—
Top Tube Length, Effective/Horizontal Unknown	—	535mm
Top Tube Slope	4.2deg	—
Head Tube Angle	72.5deg	72deg -0.5deg
Seat Tube Angle	74deg	73deg -1deg
Head Tube Length	120mm	82mm -38mm
Bottom Bracket Drop	69mm	74.5mm +5.5mm
Bottom Bracket Height	267mm	266.5mm -0.5mm
Chainstay Length	405mm	405mm +0mm
Chainstay Length Horizontal	399.1mm	398.1mm -1mm
Front-Center	579.5mm	580mm +0.5mm
Front-Center Horizontal	575.9mm	575.9mm +0mm
Wheelbase	975mm	974mm -1mm
Fork Offset/Rake	46.4mm	52.5mm +6.1mm
Fork Length (Axle-To-Crown)	370mm	—
Trail	57.3mm mid/neutral	55.6mm -1.7mm mid/neutral
Mechanical Trail	54.7mm	52.9mm -1.8mm
Wheel Flop	16.4mm	16.3mm -0.1mm
Standover Height	—	734mm
Tire to Pedal Spindle	73.5mm 170 mm cranks	69mm -4.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	97mm 170 mm cranks	96.5mm -0.5mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	25mm	30mm +5mm
Tire Width Max	25mm	—
Tire Outer Diameter	672mm	682mm +10mm
Bike Length with Tires	1647mm	1656mm +9mm
Handlebar Width	420mm	—
Stem Length	100mm	—
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Aero Bar
Frame Material	Carbon/Composite	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Rim	Disc