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

Insights

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

Somewhat aggressive stack and reach vs trend of performance road bikes

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

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