	48	51	54	54	56	58
Stack	496mm	519mm	542mm	542mm	565mm	588mm
Reach	367mm	376mm	384mm	384mm	392mm	401mm
Stack to Reach Ratio	1.35:1	1.38:1	1.41:1	1.41:1	1.44:1	1.47:1
Top Tube Length, Effective/Horizontal Unknown	520mm	535mm	550mm	550mm	565mm	581mm
Head Tube Angle	71deg	72deg	73deg	73deg	73.5deg	73.5deg
Seat Tube Angle	73deg	73deg	73deg	73deg	73deg	73deg
Head Tube Length	64mm	82mm	104mm	104mm	125mm	152mm
Bottom Bracket Drop	74.5mm	74.5mm	72mm	72mm	72mm	69.5mm
Bottom Bracket Height	266.5mm	266.5mm	269mm	269mm	269mm	271.5mm
Chainstay Length	405mm	405mm	405mm	405mm	405mm	405mm
Chainstay Length Horizontal	398.1mm	398.1mm	398.6mm	398.6mm	398.6mm	399mm
Front-Center	579mm	580mm	581mm	581mm	588mm	604mm
Front-Center Horizontal	574.9mm	575.9mm	576.5mm	576.5mm	583.5mm	600mm
Wheelbase	973mm	974mm	975mm	975mm	982mm	999mm
Fork Offset/Rake	58.5mm	52.5mm	46.5mm	46.5mm	43.5mm	43.5mm
Trail	55.5mm mid/neutral	55.6mm mid/neutral	55.6mm mid/neutral	55.6mm mid/neutral	55.6mm mid/neutral	55.6mm mid/neutral
Mechanical Trail	52.5mm	52.9mm	53.2mm	53.2mm	53.4mm	53.4mm
Wheel Flop	17.1mm	16.3mm	15.6mm	15.6mm	15.2mm	15.2mm
Standover Height	712mm	734mm	758mm	758mm	781mm	804mm
Tire to Pedal Spindle	68mm 170 mm cranks	69mm 170 mm cranks	70mm 170 mm cranks	70mm 170 mm cranks	77mm 170 mm cranks	93mm 170 mm cranks
Pedal Spindle to Ground Clearance	96.5mm 170 mm cranks	96.5mm 170 mm cranks	99mm 170 mm cranks	99mm 170 mm cranks	99mm 170 mm cranks	101.5mm 170 mm cranks

	48	51	54	54	56	58
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	30mm	30mm	30mm	30mm	30mm	30mm
Tire Width Max	32mm	—	—	34mm	—	—
Tire Outer Diameter	682mm	682mm	682mm	682mm	682mm	682mm
Bike Length with Tires	1655mm	1656mm	1657mm	1657mm	1664mm	1681mm
Crank Length	170mm	—	—	—	—	—

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale

Category Trend

Performance Road

Source:https://www.instagram.com/p/DX_qq8njHnq/, https://cdn.fbsbx.com/v/t59.2708-21/698387223_1588976878872519_4883554693508260777_n.pdf/Spect.pdf?_nc_cat=108&ccb=7-5&_nc_sid=2b0e22&_nc_ohc=30bOv7vFNLMQ7kNvwF0T_zG&_nc_oc=AdqU6F1CS_qjxGaBAVbm4GrO3QMrrwKxxaIZaii0L4VHW0SZX6knt1nfeepWQQWYayI&_nc_zt=7&_nc_ht=cdn.fbsbx.com&_nc_gid=PMvgSJwacQqXjZ-f7q0yaQ&_nc_ss=7a3ba&oh=03_Q7cD5QG_DvF7IsDiYrF7OGujKjCg3v4E7XQaU6pHEACBrPNMAg&oe=6A0E759F&dl=1

Suggest Bike Edit

2026 SPect MIRA Base

Geometry

Base Build

Stack and Reach vs. Category Trend