2020 Surly Bikes Pack Rat Base

Somewhat aggressive stack and reachvs category

Average stack and reachvs category

	38cm 26"	42cm 26"	46cm 26"	50cm 26"	52cm 650b	54cm 650b	56cm 650b	58cm 650b
Stack	479mm	495mm	512mm	527mm	551mm	566mm	580mm	595mm
Reach	371mm	372mm	378mm	384mm	387mm	392mm	397mm	402mm
Stack to Reach Ratio	1.29:1	1.33:1	1.35:1	1.37:1	1.42:1	1.44:1	1.46:1	1.48:1
Seat Tube Length, C-TTT	380mm	420mm	460mm	500mm	520mm	540mm	560mm	580mm
Top Tube Length, Effective/Horizontal Center	495mm	505mm	520mm	535mm	550mm	565mm	580mm	595mm
Top Tube Length, Actual C-C	479.6mm	490.2mm	508mm	527mm	541mm	557mm	572mm	588.5mm
Top Tube Slope	12.3deg	9.3deg	6deg	3.4deg	3.6deg	2.9deg	2.8deg	2.1deg
Head Tube Angle	72.5deg	73deg	74deg	74deg	74deg	74deg	74deg	74deg
Seat Tube Angle	75.5deg	75deg	74.5deg	74deg	73.5deg	73deg	72.5deg	72deg
Head Tube Length	90mm	105mm	120mm	135mm	130mm	145mm	160mm	175mm
Bottom Bracket Drop	45mm	45mm	45mm	45mm	55mm	55mm	55mm	55mm
Bottom Bracket Height	285.3mm	285.3mm	285.3mm	285.3mm	285mm	285mm	285mm	285mm
Chainstay Length	410mm	410mm	410mm	410mm	415mm	415mm	415mm	415mm
Chainstay Length Horizontal	407.5mm	407.5mm	407.5mm	407.5mm	411.3mm	411.3mm	411.3mm	411.3mm
Front-Center	556.3mm	557.3mm	559.3mm	569.3mm	577.3mm	587.2mm	596.2mm	605.2mm
Front-Center Horizontal	554.5mm	555.5mm	557.5mm	567.5mm	574.7mm	584.7mm	593.7mm	602.7mm
Wheelbase	962mm	963mm	965mm	975mm	986mm	996mm	1005mm	1014mm
Fork Offset/Rake	44mm	44mm	44mm	44mm	44mm	44mm	44mm	44mm
Fork Length (Axle-To-Crown)	370mm	370mm	370mm	370mm	390mm	390mm	390mm	390mm
Trail	58mm mid/neutral	55mm mid/neutral	48.9mm mid/neutral	48.9mm mid/neutral	51.7mm mid/neutral	51.7mm mid/neutral	51.7mm mid/neutral	51.7mm mid/neutral
Mechanical Trail	55.3mm	52.6mm	47mm	47mm	49.7mm	49.7mm	49.7mm	49.7mm
Wheel Flop	16.6mm	15.4mm	13mm	13mm	13.7mm	13.7mm	13.7mm	13.7mm
Standover Height	685mm	711.4mm	736mm	762mm	791mm	807mm	823mm	839.5mm
Tire to Pedal Spindle	61mm 165 mm cranks	62mm 165 mm cranks	64mm 165 mm cranks	69mm 170 mm cranks	67.3mm 170 mm cranks	77.2mm 170 mm cranks	81.2mm 175 mm cranks	90.2mm 175 mm cranks
Pedal Spindle to Ground Clearance	120.3mm 165 mm cranks	120.3mm 165 mm cranks	120.3mm 165 mm cranks	115.3mm 170 mm cranks	115mm 170 mm cranks	115mm 170 mm cranks	110mm 175 mm cranks	110mm 175 mm cranks

	38cm 26"	42cm 26"	46cm 26"	50cm 26"	52cm 650b	54cm 650b	56cm 650b	58cm 650b
Wheel Size	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD
Tire Width	2in	2in	2in	2in	48mm	48mm	48mm	48mm
Tire Outer Diameter	660.6mm	660.6mm	660.6mm	660.6mm	680mm	680mm	680mm	680mm
Bike Length with Tires	1622.6mm	1623.6mm	1625.6mm	1635.6mm	1666mm	1676mm	1685mm	1694mm
Crank Length	165mm	165mm	165mm	170mm	170mm	170mm	175mm	175mm

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

Commuter

Source:https://surlybikes.com/bikes/pack_rat

Suggest Bike Edit

2020 Surly Bikes Pack Rat Base

Geometry

Base Build

Stack and Reach vs. Category Trend