Surly Midnight Special

Name: Surly Midnight Special
Brand: Surly

2018 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 650b, 700c
Drivetrain: 2 × 11 34–50t / 11–32t
Gear range: 428%
Frame: Steel
Brakes: Mechanical disc

Sizes

Size guide

40cm
40cm
46cm
46cm
50cm
50cm
54cm
54cm
56cm
56cm
58cm
58cm
60cm
60cm
64cm
64cm

The manufacturer did not publish rider heights for these sizes.

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

4130 CroMoly, double-butted main triangle, ED coated, TIG-welded Not identified

Suspension

1 part

Fork

4130 CroMoly, ED coated, TIG-welded Not identified

Drivetrain

7 parts

Bottom bracket

68mm threaded Not identified
Cassette
- SunRace
Chain
- KMC X11 11 speeds
Crankset
- SRAM S-390 11 speeds 50/34t
S-390
Front derailleur
- SRAM Rival 22 11 speeds
Rear derailleur
- SRAM Rival 22 11 speeds
Shifters
- SRAM Rival

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Sizes and geometry

16 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 389mm

Stack 560mm

Wheelbase 1018mm

Head angle 72.5°

Seat angle 73.5°

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 16 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	363	363	366	366	379	379	389	389	393	393	402	402	409	409	423	423
Stackmm	531	531	538	538	544	544	560	560	580	580	599	599	620	620	641	641
Top tube lengthmm	500	500	520	520	540	540	555	555	570	570	585	585	605	605	625	625
Seat tube lengthmm	400	400	460	460	500	500	540	540	560	560	580	580	600	600	640	640
Head tube lengthmm	95	95	100	100	110	110	125	125	140	140	160	160	180	180	200	200
Head tube angle	71°	71°	71.5°	71.5°	72°	72°	72.5°	72.5°	73°	73°	73°	73°	73.5°	73.5°	74°	74°
Seat tube angle	75.5°	75.5°	74°	74°	73.5°	73.5°	73.5°	73.5°	73°	73°	73°	73°	72.5°	72.5°	72.5°	72.5°
Chainstay lengthmm	425	425	425	425	425	425	425	425	425	425	425	425	425	425	425	425
Wheelbasemm	993	993	994	994	1007	1007	1018	1018	1012	1012	1027	1027	1036	1036	1050	1050
Front centermm	578	578	579	579	591	591	602	602	596	596	610	610	619	619	633	633
Bottom bracket dropmm	70	70	70	70	65	65	65	65	65	65	65	65	65	65	65	65
Bottom bracket heightmm	—	279	—	279	—	284	—	284	—	284	—	284	—	284	—	284
Standover heightmm	720	720	751	751	778	778	806	806	827	827	846	846	866	866	895	895
Fork rakemm	50	50	50	50	50	50	50	50	40	40	40	40	40	40	40	40
Trailmm	62	68	58	64	55	61	52	58	59	65	59	65	55	61	53	58
Stack/reach ratio	1.46	1.46	1.47	1.47	1.44	1.44	1.44	1.44	1.48	1.48	1.49	1.49	1.52	1.52	1.52	1.52

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: 50
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 32
Lowest gear: 30.8 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Wheel options
Brake type: Mechanical disc

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
Tire width: 47c
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 650b, 700c

Technical analysis

2 measures

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

Lowest gear

30.8 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2018
Sample: 204 bicycles with this information
Coverage: 99.0% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2018
Sample: 204 bicycles with this information
Coverage: 99.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.8 km/h
Highest gear: 50.5 km/h

Total gear range 428%

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: 30.8–131.8 gear inches
Class reference (p10–p90): 24.9–131.8 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2018
Lowest gear: 204 bicycles with this information, 99.0% of the class
Highest gear: 204 bicycles with this information, 99.0% of the class