Surly Pack Rat

Name: Surly Pack Rat
Brand: Surly

2019 RoadTouring

Last known price: $1,475

Prices shown first for United States
Suspension: Rigid
Wheels: 26″, 650b
Drivetrain: 2 × 10 34–48t / 11–34t
Gear range: 436%
Frame: Steel
Brakes: Rim brake

Sizes

Size guide

38cm
42cm
46cm
50cm
52cm
54cm
56cm
58cm

The manufacturer did not publish rider heights for these sizes.

Components

20 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Surly Pack Rat, Surly 4130 CroMoly steel. Surly Pack Rat, Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded. ED coated Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket
- Shimano BB-RS500
BB-RS500
Cassette
- microSHIFT 11–34t
Chain
- KMC X10 10 speeds
Crankset
- Shimano FC-R460
FC-R460
Front derailleur
- Shimano Tiagra FD-4700 2 speeds
FD-4700
Rear derailleur
- Shimano Tiagra RD-4700-GS 10 speeds
RD-4700-GSRD-4700
Shifters
- Shimano Tiagra ST-4700
ST-4700

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Other components

1 part

Racks
- Surly

Sizes and geometry

8 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 50cm

Table

Reach 392mm

Stack 498mm

Wheelbase 975mm

Head angle 72.5°

Seat angle 75.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 8 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	377	379	386	392	397	402	408	418
Stackmm	455	471	484	498	518	532	547	561
Top tube lengthmm	495	505	520	535	550	565	580	595
Seat tube lengthmm	380	420	460	500	520	540	560	580
Head tube lengthmm	90	105	120	135	130	145	160	175
Head tube angle	72.5°	72.5°	72.5°	72.5°	74°	74°	74°	74°
Seat tube angle	75.5°	75.5°	75.5°	75.5°	73.5°	73°	72.5°	72°
Chainstay lengthmm	410	410	410	410	415	415	415	415
Wheelbasemm	960	963	965	975	986	996	1006	1015
Front centermm	554	557	559	569	577	587	597	606
Bottom bracket dropmm	45	45	45	45	55	55	55	55
Standover heightmm	685	711.4	736	762	791	807	823	839.5
Fork rakemm	44	44	44	44	44	44	44	44
Trailmm	50	54	62	64	46	45	45	50
Stack/reach ratio	1.21	1.24	1.25	1.27	1.31	1.32	1.34	1.34
Suspension and parts
Crank lengthmm	165	165	165	170	170	170	175	175
Handlebar widthmm	380	380	400	400	420	420	440	440
Stem lengthmm	70	70	70	80	80	90	90	100
Stem angle	6°	6°	6°	6°	6°	6°	6°	6°

Not published by the manufacturer: Bottom bracket height, Front travel, Rear travel, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 48
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 27.5 in
Highest gear: 120.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire clearance: Maximum tire width: 48c; Additional specification: Wheel kind: 27.5
Tire width: 42c
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 26″, 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.5 km/h
Highest gear: 46.0 km/h

Total gear range 436%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 27.5–120.0 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Changes since 2018

Changes since 2018
Specification	2018 Surly Pack Rat	This bicycle Surly Pack Rat
Drivetrain
Lowest gear	29.0 in	27.5 in
Highest gear	126.6 in	120.0 in
Wheels
Wheel configuration	Wheel options	Same size
Other specifications
Wheel size	26″ / 650b / 700c	26″ / 650b