2020 HongFu Bikes fm339 Base

	490	520	540	560	580
Stack	510.1mm	523mm	539mm	558.7mm	584.6mm
Reach	376.3mm	381mm	388mm	396.5mm	403.8mm
Stack to Reach Ratio	1.36:1	1.37:1	1.39:1	1.41:1	1.45:1
Seat Tube Length, C-T	455mm	480mm	486mm	518mm	537mm
Top Tube Length, Actual C-C	508mm	531mm	543mm	562mm	577mm
Top Tube Slope	8.1deg	6.8deg	7.8deg	6.5deg	7.1deg
Head Tube Angle	71.75deg	72.5deg	72.5deg	73.5deg	73.5deg
Seat Tube Angle	75.5deg	74deg	74deg	73.5deg	73.5deg
Head Tube Length	104mm	115mm	135mm	153mm	180mm
Bottom Bracket Drop	74mm	74mm	70mm	70mm	70mm
Bottom Bracket Height	265mm	265mm	269mm	269mm	269mm
Chainstay Length	407mm	407mm	407mm	407mm	407mm
Chainstay Length Horizontal	400.2mm	400.2mm	400.9mm	400.9mm	400.9mm
Front-Center	572.1mm	574.1mm	587.5mm	592.6mm	607.2mm
Front-Center Horizontal	569.3mm	569.8mm	580.1mm	588.2mm	603.2mm
Wheelbase	969.5mm	970mm	981mm	989.1mm	1004.1mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm
Fork Length, Unknown	370mm	370mm	370mm	370mm	370mm
Trail	64.4mm mid/neutral	59.7mm mid/neutral	59.7mm mid/neutral	53.5mm mid/neutral	53.5mm mid/neutral
Mechanical Trail	61.2mm	56.9mm	56.9mm	51.3mm	51.3mm
Wheel Flop	19.2mm	17.1mm	17.1mm	14.6mm	14.6mm
Tire to Pedal Spindle	63.1mm 170 mm cranks	65.1mm 170 mm cranks	78.5mm 170 mm cranks	83.6mm 170 mm cranks	98.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	95mm 170 mm cranks	95mm 170 mm cranks	99mm 170 mm cranks	99mm 170 mm cranks	99mm 170 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:http://www.hongfu-bikes.com/html_products/Road_Frame/Disc_Brake_Road_Frame/2018/0901/510.html

Geometry