Surly Lowside

Name: Surly Lowside
Brand: Surly

2025 UrbanHipster Manufacturer page

Last known price: $1,799

Prices shown first for United States
Suspension: Rigid
Wheels: 650b
Drivetrain: 1 × 1 32t / 17t
Gear range: 100%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 142–151
SM 152–164
MD 165–174
LG 175–184
XL Not informed

Components

13 of 18 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 Lowside - 4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded, E.D. coated Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket

73mm threaded (1.37" x 24TPI) Not identified
Cassette
- Surly
Chain
- KMC X9 9 speeds
Crankset
- SRAM NX Eagle 11 speeds 32t
Front derailleur

None
Rear derailleur

None
Shifters

None

Brakes

3 parts

Brake levers
- Tektro HD-M275 / HD-M276
HD-M275HD-M276
Brakes
- Tektro HD-M275 / HD-M276
HD-M275HD-M276
Disc rotors

Disc - 51mm I.S. (203mm max rotor) Not identified

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Handlebar
- Surly
Headset
- FSA ORBIT ITA
Saddle
- WTB Volt
Seatpost

Ø30.9mm Not identified
Stem

Sunday Freeze Stem Top-Load, Silver Not identified

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 445mm

Stack 574mm

Wheelbase 1110mm

Head angle 70.0°

Seat angle 74.0°

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	414.5	429.3	445.3	461	477
Stackmm	542.2	560.3	574.4	588.5	602.5
Top tube lengthmm	570	590	610	630	650
Seat tube lengthmm	316	366	416	466	516
Head tube lengthmm	110	125	140	155	170
Head tube angle	70°	70°	70°	70°	70°
Seat tube angle	74°	74°	74°	74°	74°
Chainstay lengthmm	425	425	425	425	425
Wheelbasemm	1068	1089	1110	1131	1152
Front centermm	649	670	691	712	733
Bottom bracket dropmm	55	55	55	55	55
Standover heightmm	700	729	762	792	823
Fork rakemm	47	47	47	47	47
Trailmm	66	66	66	66	66
Stack/reach ratio	1.31	1.31	1.29	1.28	1.26
Suspension and parts
Crank lengthmm	165	165	165	170	170
Handlebar widthmm	820	820	820	820	820
Stem lengthmm	48	48	48	48	48

Not published by the manufacturer: Bottom bracket height, Front travel, Rear travel, 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: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 1
Smallest sprocket: 17
Largest sprocket: 17
Lowest gear: 51.8 in
Highest gear: 51.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: No shifting

Additional specifications

Bottom bracket standard: BSA
Tire width: 2.8″
Wheel material: Aluminum
Wheel size: 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 19.8 km/h
Highest gear: 19.8 km/h

Total gear range 100%

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.