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roll: Bicycle Company S:1 Sport Bike Step-Thru

roll: Bicycle Company S:1 Sport Bike Step-Thru
  • Color: British Racing Green/Black Components
  • Color: British Racing Green/Silver Components
  • Color: Carrera White/Black Components
  • Color: Carrera White/Silver Components
  • Color: Matte Bengal Red/Black Components
  • Color: Matte Bengal Red/Silver Components
  • Color: Matte Silver Ti/Black Components
  • Color: Matte Silver Ti/Silver Components
Please select options


We imagined it, we designed it, and we built it: all that we desired in a flat bar road bike crafted and engineered with superior components and uncompromised by convention or price. An iconic double diamond profile, deceptively fast, and deliberately understated. Ideal for those days when you want to sweat a little, or commute, or maybe both. The S:1 is designed with meticulous attention to detail. Ultimately to get you there discreetly, effortlessly, and very, very quickly.

With the S:1 we were determined to refine rider position to achieve superior control, handling, and comfort without sacrificing forward motion. Gender specific sports saddle, our custom roll: flat handlebar and cockpit set up combine to create the most effective and efficient position to transfer power into the pedals. There's a single thumb shifter for intuitive gear changing and a nifty 1x10 drive train that has the range of a traditional 2x9 but without the weight of a front derailleur. Our disc brakes offer performance far beyond traditional rim brakes, and although they're hidden, we favor superior sealed bearings throughout for low maintenance and maximum lifespan. The components we use are anything but 'standard'; We're committed to sourcing the best, and if we're not satisfied we design our own. You'll feel a distinct difference in the ride, not because of one exceptional component but the considered combination of them all. If you like to go faster farther, you'll fall in love with the S:1.

Geometry Chart:
Frame SizeSize 1Size 2
Top Tube Length, Horizontal 580mm 600mm
Head Tube Length 145mm 170mm
Head Tube Angle 70.5° 71.0°
Seat Tube Angle 72.0° 71.5°
Seat Tube Length 430mm 485mm
BB Drop 60mm 60mm
Fork Length, Full 405mm 405mm
Fork Rake/Offset 45mm 45mm
Chainstay Length 450mm 450mm
Wheelbase 1067mm 1077mm
Bike Standover Height 710mm 755mm
Frame SizeRider Height
Size 1 5'0" – 5'5"
Size 2 5'6" – 5'11"


Frame Light weight, double butted 6061 aluminum, with internal cable routing.
Fork Hydro-formed 6061 aluminum disc specific, with alloy steerer tube.
Rims 700c 32hole double wall anodized alloy.
Hubs Polished aluminum disc, sealed cartridge bearings, bolt on QR Skewers.
Spokes Stainless steel 14g spokes stainless steel nipples.
Tires 700x28mm Kenda K1176 Sport Road.
Bottom Bracket Alloy shell with sealed cartridge bearings, square taper steel axle.
Crankset Forged 6061 aluminum polished crank arms, with alloy chain guard.
Chainrings Front: 42 Tooth machined alloy, 3/32"
Shifters SRAM Via Centro 10 Speed 1x10 trigger shifter.
Rear Derailleur SRAM Via Centro 10 Speed 1x10 long cage.
Cassette/Freewheel SRAM PG-1030 10 speed 11-36 PowerGlide II.
Chain KMC X10-93 10 speed, silver.
Brakes Tektro MD-M300, mechanical disc brake, with 160mm TR-1 Rotor.
Brake Levers Tektro CL-530 with cushioned lever insert.
Handlebars 6061 Aluminum S:1 Sport bar, 660mm wide, 9.0° sweep, 5.0° rise
Tape/Grips Ergonomic krayton grips with integrated bar ends.
Stem 3D Forged aluminum alloy, +/- 7 degree rise
Headset VP alloy semi integrated with sealed cartridge bearings
Seatpost Aluminum alloy 30.9mm diameter with 12.9mm offset.
Saddle Men's Road Saddle, with steel rails.
Pedals Nylon platform with sealed bearings.

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
British Racing Green/Black Components / Small 735203140122 BKE-1B-SPTST-SBRGB-M 210000014384
British Racing Green/Black Components / Medium 735203380108 BKE-1B-SPTST-MBRGB-M 210000014385
British Racing Green/Silver Components / Small 735203206217 BKE-1B-SPTST-SBRGS-M 210000014388
British Racing Green/Silver Components / Medium 735203209294 BKE-1B-SPTST-MBRGS-M 210000014389
Carrera White/Black Components / Small 735203382881 BKE-1B-SPTST-SWTEB-M 210000014392
Carrera White/Black Components / Medium 735203408680 BKE-1B-SPTST-MWTEB-M 210000014393
Carrera White/Silver Components / Small 735203371007 BKE-1B-SPTST-SWTES-M 210000014396
Carrera White/Silver Components / Medium 735203448686 BKE-1B-SPTST-MWTES-M 210000014397
Matte Bengal Red/Black Components / Small 735203412915 BKE-1B-SPTST-SREDB-M 210000014401
Matte Bengal Red/Black Components / Medium 735203166344 BKE-1B-SPTST-MREDB-M 210000014403
Matte Bengal Red/Silver Components / Small 735203488187 BKE-1B-SPTST-SREDS-M 210000014409
Matte Bengal Red/Silver Components / Medium 735203309055 BKE-1B-SPTST-MREDS-M 210000014411
Matte Silver Ti/Black Components / Small 735203436140 BKE-1B-SPTST-SSLVB-M 210000014400
Matte Silver Ti/Black Components / Medium 735203066071 BKE-1B-SPTST-MSLVB-M 210000014402
Matte Silver Ti/Silver Components / Small 735203207948 BKE-1B-SPTST-SSLVS-M 210000014408
Matte Silver Ti/Silver Components / Medium 735203204589 BKE-1B-SPTST-MSLVS-M 210000014410