2015 Specialized Bicycles Amira Base

	44	48	51	54	56
Stack	503mm	515mm	528mm	547mm	567mm
Reach	365mm	371mm	378mm	378mm	380mm
Stack to Reach Ratio	1.38:1	1.39:1	1.4:1	1.45:1	1.49:1
Seat Tube Length, C-T	440mm	480mm	510mm	540mm	560mm
Top Tube Length, Effective/Horizontal Center	498mm	506mm	518mm	537mm	548mm
Top Tube Slope	9.2deg	5.8deg	3.9deg	3deg	3.2deg
Head Tube Angle	70.5deg	71.25deg	72deg	72deg	72deg
Seat Tube Angle	76deg	75.75deg	75.5deg	74deg	73.5deg
Head Tube Length	105mm	115mm	125mm	145mm	165mm
Bottom Bracket Drop	73mm	73mm	73mm	73mm	71.5mm
Bottom Bracket Height	263mm	263mm	263mm	263mm	264.5mm
Chainstay Length	405mm	405mm	405mm	405mm	408mm
Chainstay Length Horizontal	398.4mm	398.4mm	398.4mm	398.4mm	401.7mm
Front-Center	576mm	580mm	582mm	588mm	596mm
Front-Center Horizontal	571.6mm	575.6mm	577.6mm	583.6mm	591.3mm
Wheelbase	970mm	974mm	976mm	982mm	993mm
Fork Offset/Rake	51mm	51mm	49mm	49mm	49mm
Trail	64.9mm mid/neutral	60.2mm mid/neutral	57.7mm mid/neutral	57.7mm mid/neutral	57.7mm mid/neutral
Mechanical Trail	61.2mm	57mm	54.8mm	54.8mm	54.8mm
Wheel Flop	20.4mm	18.3mm	16.9mm	16.9mm	16.9mm
Standover Height	692mm	718mm	735mm	758mm	777mm
Tire to Pedal Spindle	75mm 165 mm cranks	79mm 165 mm cranks	76mm 170 mm cranks	82mm 170 mm cranks	87.5mm 172.5 mm cranks
Pedal Spindle to Ground Clearance	98mm 165 mm cranks	98mm 165 mm cranks	93mm 170 mm cranks	93mm 170 mm cranks	92mm 172.5 mm cranks

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.

Category Trend

Source:https://www.specialized.com/us/en/amira-sl4-comp/p/65598?color=174547-65598

Geometry