Velopedia Bicycle Archive

Surly Preamble Drop Bar - Thorfrost White

City/Commuter bicycle from the Velopedia specification archive.

Model year: Not published by manufacturer
Original MSRP: $1,199.00
Sizes: X-Small; Small; Medium; Large; X-Large
Colors: Thorfrost White
Geometry: 5 manufacturer sizes
Archive ID: 900000441
Catalog verified: August 13, 2026

Current market

Checking current listings…

Velopedia analysis

What the specifications mean

Derived from the archived manufacturer record

The calculated 327% cassette spread is a clearer measure of gearing breadth than the component-group name by itself. The 700C label identifies a 622 mm bead-seat diameter, but tire width and frame or fork clearance remain separate compatibility questions. For the steel frame, paint damage and moisture entry matter because corrosion can begin at scratches, vent holes or internal surfaces.

Gearing 327% cassette range Calculated from the published 11–36-tooth sprocket span.

Wheel standard 700C · 622 mm The label fixes rim diameter, not tire width or available frame and fork clearance.

Frame inspection Steel Paint damage and moisture entry matter because corrosion can start externally or inside the frame.

Original MSRP $1,199.00 Historical launch-position context—not a current valuation or asking price.

Used-bike inspection

If you’re buying this bike used

Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.

FrameCheck paint chips, vent holes and the inside of the seat tube for corrosion. Also look for dents, bent tubes and cracking around welded or brazed joints.
DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 9-speed system.
Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.
BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.

This interpretation explains relationships in the published data. Confirm exact standards and dimensions before ordering parts or performing service.

Frameset

Frame Construction	Surly Preamble, 100% Chromoly steel tubing, E.D. coated
Frame Material	Steel
Fork	Surly Preamble, 100% Chromoly steel fork, Disc Only
Fork Material	Steel

Drivetrain

Shifters	microSHIFT R400
Front Derailleur	N/A
Rear Derailleur	microSHIFT RD-M46S
Crankset	Samox, 3-piece, 40t
Bottom Bracket	Samox
Cassette	microSHIFT 11-36t, 9-speed
Chain	KMC Z9

Brakes

Brakes	Brake Calipers: Avid BB7 Mechanical; Brake Levers: microSHIFT R400-L and R-490-R; Rotors: SRAM 160mm, front and rear

Cockpit & Contact Points

Headset	VP 1-1/8" Threadless
Handlebar	Salsa Cowbell
Stem	Kalloy 31.8
Saddle	Selle Italia X Base
Seatpost	Kalloy 27.2 x 300mm

Wheels & Tires

Hubs	(F) Novatec, 6-bolt disc, 32h, QR / (R) Novatec, 6-bolt disc, 32h, QR
Rims	21mm, 32h
Front Tire	Kenda Kwik Tendril 700c x 35mm (MD/LG/XL sizes) & Kenda Standard 650b x 1.35 (XS/SM sizes)
Rear Tire	Kenda Kwik Tendril 700c x 35mm (MD/LG/XL sizes) & Kenda Standard 650b x 1.35 (XS/SM sizes)
Wheel Size	700C; 650B

Size-specific frame data

Geometry

5 sizes · 16 measurements

Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.

Measurement	X-Small	Small	Medium	Large	X-Large
Seat tube	410 mm	505 mm	565 mm	605 mm	645 mm
Effective top tube	500 mm	545 mm	570 mm	600 mm	630 mm
Head tube	120 mm	135 mm	130 mm	170 mm	210 mm
Head-tube angle	70°	71°	72°	72°	72°
Seat-tube angle	74°	73°	72.5°	72°	72°
Chainstay / rear center	420 mm	420 mm	435 mm	435 mm	435 mm
Wheelbase	987 mm	1013 mm	1030 mm	1055 mm	1085 mm
Bottom-bracket drop	54 mm	54 mm	66 mm	66 mm	66 mm
Reach	352 mm	381 mm	391 mm	404 mm	421 mm
Stack	517 mm	535 mm	567 mm	605 mm	643 mm
Standover height	722 mm	776 mm	826 mm	863 mm	901 mm
Fork offset / rake	47 mm	47 mm	44 mm	44 mm	44 mm
Fork length / axle-to-crown	380 mm	380 mm	400 mm	400 mm	400 mm
Crank length	165 mm	170 mm	170 mm	175 mm	175 mm
Stem length	80 mm	80 mm	90 mm	100 mm	100 mm
Handlebar width	380 mm	400 mm	420 mm	440 mm	460 mm

Geometry source: Manufacturer HTML geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.