Velopedia Bicycle Archive

Surly Skid Loader - Bathwater Gray

Electric-assist bicycle from the Velopedia specification archive.

Model year: Not published by manufacturer
Original MSRP: $4,799.00
Sizes: Small; Medium; Large
Colors: Bathwater Gray
Geometry: 3 manufacturer sizes
Archive ID: 900000568
Catalog verified: August 14, 2026

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Frameset

Frame Construction	Surly Skid Loader - 100% Surly Chromoly Steel, Natch tubing, double-butted main traingle, TIG welded, E.D. coated
Frame Material	Steel
Fork	Surly Dinner Fork - 100% Surly Chromoly Steel, Natch tubing, double-butted tapered fork blades, TIG welded, E.D. coated
Fork Material	Steel

Drivetrain

Shifters	microSHIFT Advent X Pro
Front Derailleur	N/A
Rear Derailleur	microSHIFT Advent X 10-speed
Crankset	FSA Mega Arm set for Bosch, with FSA Mega Ring Steel, 38t
Cassette	microSHIFT Advent X H-Series 10-speed, 11-48t
Chain	TAYA 10-speed

Brakes

Brakes	Brake Calipers: Tektro 4-piston M745; Brake Levers: Tektro M745; Rotors: Tektro 6-bolt 180 mm

Cockpit & Contact Points

Headset	Cane Creek ViscoSet/40 series
Handlebar	Surly Terminal Bar
Stem	Kalloy 4-bolt 31.8 mm clamp
Saddle	WTB Volt
Seatpost	Trans-X Dropper Post, 120 mm/400 mm

Wheels & Tires

Hubs	(F) Novatec thru-axle, 36h, 15 x 110mm / (R) Novatec HG spline cassette hub, sealed bearing, thru-axle, 36h, 12 x 148 mm
Rims	WTB i35 27.5 HTZ, 36h
Spokes	Stainless 14g
Front Tire	Surly ExtraTerrestrial 27.5 x 2.5", Tubeless Ready, 60tpi
Rear Tire	Surly ExtraTerrestrial 27.5 x 2.5", Tubeless Ready, 60tpi
Wheel Size	27.5"

Size-specific frame data

Geometry

3 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	Small	Medium	Large
Seat tube	445 mm	445 mm	500 mm
Effective top tube	560 mm	595 mm	630 mm
Head tube	160 mm	185 mm	210 mm
Head-tube angle	69°	69°	69°
Seat-tube angle	72.5°	72.5°	72.5°
Chainstay / rear center	530 mm	530 mm	530 mm
Wheelbase	1153 mm	1190 mm	1226 mm
Bottom-bracket drop	60 mm	60 mm	60 mm
Reach	373 mm	401 mm	428 mm
Stack	593 mm	616 mm	640 mm
Standover height	709 mm	743 mm	780 mm
Fork offset / rake	50 mm	50 mm	50 mm
Fork length / axle-to-crown	420 mm	420 mm	420 mm
Crank length	170 mm	175 mm	175 mm
Stem length	60 mm	70 mm	70 mm
Handlebar width	718 mm	735 mm	735 mm

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