Surly Preamble Flat Bar

2023 UrbanCommuter Manufacturer page

Last known price: $899

Prices shown first for United States
Suspension: Rigid
Wheels: 650b
Drivetrain: 1 × 8 40t / 12–42t
Gear range: 350%
Frame: Steel
Brakes: Mechanical disc

Rider height by size (cm)

Size guide

XS 152.4–165.1
SM 162.6–172.7
MD 170.2–182.9
LG 180.3–190.5
XL 188–200.7

Components

17 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 Preamble, 100% Chromoly steel tubing, E.D. coated Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket

JIS 68 x 124.5mm Not identified
Cassette
- microSHIFT 12–42t
Chain
- KMC Z8.3 8 speeds
Crankset
- Samox 40t
Front derailleur

None
Rear derailleur
- microSHIFT Acolyte Medium Cage SpringLock 8 speeds
RD-M5185M
Shifters
- microSHIFT Acolyte

Brakes

3 parts

Wheels and tires

4 parts

Front hub
- Novatec
Rear hub
- Novatec
Rims

21mm, 32h, Tubeless Compatible Not identified
Tires
- Kenda

Cockpit and contact points

5 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 391mm

Stack 567mm

Wheelbase 1030mm

Head angle 72.0°

Seat angle 72.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 650b wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	352	381	391	404	421
Stackmm	517	535	567	605	643
Top tube lengthmm	500	545	570	600	630
Seat tube lengthmm	410	505	565	605	645
Head tube lengthmm	120	135	130	170	210
Head tube angle	70°	71°	72°	72°	72°
Seat tube angle	74°	73°	72.5°	72°	72°
Chainstay lengthmm	420	420	435	435	435
Wheelbasemm	987	1013	1030	1055	1085
Front centermm	573	599	604	629	658
Bottom bracket dropmm	54	54	66	66	66
Standover heightmm	722	776	826	863	901
Fork rakemm	47	47	44	44	44
Trailmm	70	64	61	61	61
Stack/reach ratio	1.47	1.40	1.45	1.50	1.53
Suspension and parts
Crank lengthmm	165	170	170	175	175
Handlebar widthmm	380	400	420	440	460
Stem lengthmm	80	80	90	100	100
Stem angle	7°	7°	7°	7°	7°

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: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 8
Smallest sprocket: 12
Largest sprocket: 42
Lowest gear: 26.2 in
Highest gear: 91.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 35c
Wheel material: Aluminum
Wheel size: 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.0 km/h
Highest gear: 35.1 km/h

Total gear range 350%

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.