Surly Pack Rat

Name: Surly Pack Rat
Brand: Surly

2018 RoadTouring Manufacturer page

Suspension: Rigid
Wheels: 26″, 650b, 700c
Drivetrain: 2 × 10 34–48t / 11–34t
Gear range: 436%
Frame: Steel
Brakes: Rim brake

Sizes

Size guide

52cm
52cm
52cm
54cm
54cm
54cm
56cm
56cm
56cm
58cm
58cm
58cm

The manufacturer did not publish rider heights for these sizes.

Components

18 of 20 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. Main triangle double-butted. TIG-welded. ED coated Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket

68mm wide, standard English threaded 1.37˝ x 24t Not identified
Cassette
- microSHIFT 11–34t
Chain
- KMC X10EL 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

Sizes and geometry

12 sizes Open in the geometry plotter

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

Size 54cm

Table

Reach 402mm

Stack 532mm

Wheelbase 996mm

Head angle 74.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 12 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	397	397	397	402	402	402	408	408	408	418	418	418
Stackmm	518	518	518	532	532	532	547	547	547	561	561	561
Top tube lengthmm	550	550	550	565	565	565	580	580	580	595	595	595
Seat tube lengthmm	520	520	520	540	540	540	560	560	560	580	580	580
Head tube lengthmm	130	130	130	145	145	145	160	160	160	175	175	175
Head tube angle	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°
Seat tube angle	73.5°	73.5°	73.5°	73°	73°	73°	72.5°	72.5°	72.5°	72°	72°	72°
Chainstay lengthmm	415	415	415	415	415	415	415	415	415	415	415	415
Wheelbasemm	986	986	986	996	996	996	1006	1006	1006	1015	1015	1015
Front centermm	577	577	577	587	587	587	597	597	597	606	606	606
Bottom bracket dropmm	55	55	55	55	55	55	55	55	55	55	55	55
Bottom bracket heightmm	—	—	281	—	—	281	—	—	281	—	—	281
Standover heightmm	791	791	791	807	807	807	823	823	823	839.5	839.5	839.5
Fork rakemm	44	44	44	44	44	44	44	44	44	44	44	44
Trailmm	43	46	52	42	45	51	42	45	51	47	50	56
Stack/reach ratio	1.31	1.31	1.31	1.32	1.32	1.32	1.34	1.34	1.34	1.34	1.34	1.34

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, 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: 29.0 in
Highest gear: 126.6 in

Wheels and brakes

Wheel configuration: Wheel options
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, 700c

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 48.5 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.