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The challenge was thus: Build a serious steel bike and give it only the attributes that matter most. Make it quick and comfortable on pavement, as well as confident and compliant on degraded surfaces. What the Enginerds put forth is Preamble, a pavement and gravel utility worker that proves you don’t need to cut corners or clip coupons to make a more affordable steel bike. You just need to keep shit simple.
Preamble can run racks and fenders and carry a couple water bottles. Surly was raised on stealing basic cable, after all. Smooth and efficient on asphalt, Preamble’s double-butted main triangle provides a resplendent ride feel and withstands abuse from life’s inevitable potholes. Make it your own with flat bars, drop bars, a basket, or bags. On the road to steel euphoria, Preamble is the gateway drug.
Frame
Surly Preamble - 100% Surly Chromoly steel, Natch tubing, double-butted main triangle, TIG welded, E.D. coated
Color
Hi-Viz Black
Fork
Surly Preamble - 100% Surly Chromoly steel, Natch tubing, double-butted tapered fork blades, TIG welded, E.D. coated
Headset
FSA Orbit MX
Seatpost Clamp
Surly Stainless 30.0
Seatpost
Kalloy 27.2 x 300mm: 0 offset (XS-MD), 12mm offset (LG-XL)
Stem
Kalloy AL 31.8mm
Grips/Bar Tape
Velo Black
Saddle
WTB Volt Wide
Handlebar
Kalloy AL, 9 degree backsweep, 35mm rise
Front Derailleur
N/A
Rear Derailleur
Shimano Cues U4000 GS
Cassette
Shimano Cues LG400, 11-46t, 9spd
Chain
Shimano LG500
Crankset
Shimano Cues U4000, 40T
Shifter
Shimano Cues U4000
Brake Levers
Tektro HD-M275 OR Tektro HD-M3120
Brake Calipers
Tektro HD-M275 OR Tektro HD-M3120, 2 Piston
Bottom Bracket
Shimano UN101, 68mm BSA
Rotors
Tektro 160/160mm, Center Lock
Front Tire
-SM), Tan Sidewalls
Teravail Washburn 700c x 35, 30tpi, Wire Bead (MD-XL), Tan Sidewalls
Rear Tire
Teravail Washburn 650b x 35, 30tpi, Wire Bead (XS-SM), Tan Sidewalls
Teravail Washburn 700c x 35, 30tpi, Wire Bead (MD-XL), Tan Sidewalls
Front Hub
Shimano MT200 QR x 100mm, Center Lock, 32h
Rear Hub
Shimano QC400 QR x 141mm, Center Lock, 32h
Spoke
14G Black
Rim
Shining DB-21, 32h
Complete Bike
27 lb 7 oz for Medium
*Specifications are subject to change without notice

| Size | X-Small | Small | Medium | Large | X-Large |
|---|---|---|---|---|---|
| A. Effective Top Tube | 500.0 | 545.0 | 570.0 | 600.0 | 630.0 |
| B. Stand Over | 722.0 | 776.0 | 826.0 | 863.0 | 901.0 |
| C. Reach | 352.0 | 381.0 | 391.0 | 404.0 | 421.0 |
| D. Stack | 517.0 | 535.0 | 567.0 | 605.0 | 643.0 |
| E. Total Seat Tube Length | 410.0 | 505.0 | 565.0 | 605.0 | 645.0 |
| F. Headtube Length | 120.0 | 135.0 | 130.0 | 170.0 | 210.0 |
| G. Headtube Angle |
70.0
|
71.0
|
72.0
|
72.0
|
72.0
|
| H. Seat Tube Angle |
74.0
|
73.0
|
72.5
|
72.0
|
72.0
|
| I. BB Drop | 54.0 | 54.0 | 66.0 | 66.0 | 66.0 |
| K. Chainstay Length | 420.0 | 420.0 | 435.0 | 435.0 | 435.0 |
| L. Fork Length Axle to Crown | 380.0 | 380.0 | 400.0 | 400.0 | 400.0 |
| M. Fork Offset | 47.0 | 47.0 | 44.0 | 44.0 | 44.0 |
| N. Wheelbase | 987.0 | 1013.0 | 1030.0 | 1055.0 | 1085.0 |
| Crank Arm Length | 170.0 | 170.0 | 170.0 | 175.0 | 175.0 |
| Handlebar Width | 700.0 | 700.0 | 720.0 | 720.0 | 720.0 |
| Recommended Rider Height | 152.4 - 165.1 | 162.56 - 172.72 | 170.18 - 182.88 | 180.34 - 190.5 | 187.96 - 200.66 |
| Stem Length | 80.0 | 90.0 | 90.0 | 100.0 | 100.0 |