Surly PREAMBLE Thorfrost microSHIFT Gravel Bike Chromoly

The challenge was as follows: Build a serious steel bike and give it only the attributes that matter most. Fast and comfortable on tarmac, as well as safe and comfortable on degraded surfaces. What the engineers have created is the Surly Preamble, a gravel and tarmac bike that proves you don't need to cut corners to make a more affordable steel bike. Just simplify things.

Preamble can carry a rack, mudguards and a couple of water bottles. Smooth and efficient on the tarmac, the Preamble's double butted main triangle provides a slick ride feel and withstands the abuse of life's inevitable bumps.


Frame: Surly Preamble, 100% Chromoly steel tubing, E.D. coated.
Fork: Surly Preamble, 100% Chromoly steel, disc only
Seatpost Clamp: Surly stainless 30.0
Headset: VP 1-1/8" non-threaded
Brakes: Avid BB7 Mechanical
Brake Levers: microSHIFT R400-L and R-490-R
Rotors: SRAM 160mm F/R
Shift Lever: microSHIFT R400
Stem: Kalloy 31.8
Handlebars: Salsa Cowbell
Grip/Tape: Black Cork
Saddle: Selle Italia X-Base
Seatpost: Kalloy 27.2 x 300mm
Crankset: Samox, 3-piece, 40t
Bottom Bracket: JIS 68 x 124.5mm
Rear derailleur: microSHIFT RD-M46S
Sprocket or sprocket set: microSHIFT 11-36t, 9 speed
Chain: KMC Z9
Wheel hub: Novatec, 6-bolt disc, 32h, QR
Tyres: Kenda Kwik Tendril 700c x 35mm (MD/LG/XL) & Kenda Standard 650b x 1.35 (XS/SM)


Wheel sizes:

Size S: 650B
Size M, L, XL: 700C: