Surly Flat Bar Cross-Check

Name: Surly Flat Bar Cross-Check
Brand: Surly

2017 UrbanCommuter

Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 9 42t / 11–34t
Gear range: 309%
Frame: Steel
Brakes: Rim brake

Sizes

Size guide

42cm
46cm
50cm
52cm
54cm
56cm
58cm
60cm
62cm
64cm

The manufacturer did not publish rider heights for these sizes.

Components

12 of 19 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 4130 CroMoly steel. Main triangle double-butted. TIG-welded. ED Coated Not identified

Suspension

1 part

Fork

4130 CroMoly, lugged and brazed. Sloping crown with threaded eylets, tapered and butted curved blades with mid-blade rack eyelets, dual dropout eyelets Not identified

Drivetrain

7 parts

Bottom bracket

68mm wide, standard English threaded 1.37˝ x 24t Not identified
Cassette
- SRAM PG-920 9 speeds
PG-920
Chain
- KMC X9 9 speeds
Crankset

E400 42Tw/Chainguard Not identified
Front derailleur

None
Rear derailleur

X5 Not identified
Shifters

X5 Not identified

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Sizes and geometry

10 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 395mm

Stack 538mm

Wheelbase 1014mm

Head angle 72.0°

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 10 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	378.7	380.8	389.1	389.7	394.8	394.3	398.3	407.3	411	424.5
Stackmm	528	528	528	528	538.4	556.5	575.7	593.6	612.7	630.9
Top tube lengthmm	522	528.8	541.8	547.1	560	570	580	600	610	630
Seat tube lengthmm	420	460	500	520	540	560	580	600	620	665
Head tube lengthmm	91	91	91	91	102	121	141	160	180	200
Head tube angle	72°	72°	72°	72°	72°	72°	72°	72°	72°	72°
Seat tube angle	75°	74.5°	74°	73.5°	73°	72.5°	72.5°	72°	72°	72°
Chainstay lengthmm	420	420	425	425	425	425	425	425	425	425
Wheelbasemm	989.8	991.9	1005.2	1005.9	1014.3	1019.7	1029.9	1044.7	1054.7	1074.6
Front centermm	579	581	589	590	598	603	614	628	638	658
Bottom bracket dropmm	66	66	66	66	66	66	66	66	66	66
Standover heightmm	731.9	750.7	768.4	778.4	793	810.7	829.9	847.4	866.2	885.8
Fork rakemm	44	44	44	44	44	44	44	44	44	44
Trailmm	67	67	67	67	67	67	67	67	67	67
Stack/reach ratio	1.39	1.39	1.36	1.36	1.36	1.41	1.45	1.46	1.49	1.49

Not published by the manufacturer: Bottom bracket height, 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: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 35.8 in
Highest gear: 110.7 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: 42c; Additional specification: Wheel kind: 700
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

35.8 gear inches

This value is above the central range for this class.

Cohort: Urban / Commuter Model year: 2017
Sample: 112 bicycles with this information
Coverage: 74.1% of the class

Highest gear

110.7 gear inches

This value is within the central range for this class.

Cohort: Urban / Commuter Model year: 2017
Sample: 112 bicycles with this information
Coverage: 74.1% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 13.7 km/h
Highest gear: 42.4 km/h

Total gear range 309%

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: 35.8–110.7 gear inches
Class reference (p10–p90): 16.3–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Urban / Commuter Model year: 2017
Lowest gear: 112 bicycles with this information, 74.1% of the class
Highest gear: 112 bicycles with this information, 74.1% of the class