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All-City Big Block

All-City Big Block
  • Color: Night Sky/Smoke
Color: Night Sky/Smoke
Size: Select size
Please select options Unavailable
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A meticulously designed, beautifully-constructed track racer destined to take the modern fixed-gear rider beyond the velodrome.

Built to be the track bike we'd always dreamed of owning, this competition-ready steel frame soaks up bumps and sprints like a champ. Boasting a single set of bottle bosses and bumped-up tire clearance, it's drilled for brakes and fully street legal.

612 Select Tubing
- We've carefully chosen every piece of tubing on every frame size to provide the best ride possible.

Drilled For Brakes
- Drilled for front and rear brakes when quick and safe stopping is needed off the track.

Tire Clearance
- Run 25c tires on the track or swap 'em out for 32c tires when you're ready to hit the street.

Lugged Fork Crown
- Thoughtful custom touches add class and style—perhaps where you least expect it.

Signature Seat Collar
- Train your eyes on that timeless and tasteful brazed-on seat collar, elegantly designed around the All-City logo.

Custom Dropouts
- Signature stainless steel Hennepin Bridge track dropouts add grace and a dash of pride for AC's home turf.

Reinforced Bottle Bosses
- Beautiful stars reinforce the bottle bosses and our obsessive attention to detail.

Liquid Paint and E.D. Coat
- Our topnotch wet paint finish sparkles with depth and luster, while an E.D. coating protects against rust.


 A  Head Tube Angle 73 73.5 74 74.5 74.5 75
 B  Seat Tube Angle 75 75 74.5 74.5 74.5 74.5
 C  Top Tube Length 520 535 550 565 585 605
 D  Seat Tube Length 460 490 520 550 580 610
 E  Chainstay Length 396 396 396 396 396 396
 F  Bottom Bracket Drop 58 58 58 58 58 58
 G  Fork Offset 32 32 32 32 32 32
 H  Total Fork Length 375 375 375 375 375 375
 I  Head Tube Length 95 110 130 150 175 200
 J  Standover 750 772 796 821 847 874
 K  Wheelbase 945.5 956.8 963.2 973.9 993.9 1008.8
 L  Stack 508.8 524.6 545.3 566 590.2 615.9
 M  Reach 383.7 394.4 394.4 398.8 421.3 434.2
 Handlebar Width 40 40 42 42 44 44
 Stem Length 80 90 100 100 110 110
 Crank Arm Length 165 165 165 165 165 165

WARNING: Cycling can be dangerous. Bicycles and bicycle products should be assembled and serviced by a professional mechanic. Never modify your bicycle or accessories. Read and follow all product instructions and warnings including information on the manufacturer’s website. Inspect your bicycle before every use. Always wear a helmet.

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to


Frame 612 Select Chromoly Steel
Fork 612 Select Chromoly Steel
Rims Sun CR-18, 32h, Silver
Hubs Fix/Free, 32h, polished silver
Tires Vittoria ZAFFIROS IV 700x28c Steel Bead Black
Bottom Bracket Square Taper, 68x110mm steel cups, sealed bearings
Crankset All-City 612 Track Crank, 165mm, 46T ring
Cassette/Freewheel All-City standard, 17T
Chain KMC, silver, 1/8"
Brakes Tektro R539, mid reach, front installed
Brake Levers Tektro FL750, polished silver
Tape/Grips Lock-On, Black
Headset VP 1-1/8" threadless, polished silver
Seatpost 27.2mm, polished silver
Saddle All-City Gonzo
Pedals Sold separately
Accessories & Extras E.D. coated for durability and rust prevention

* Subject to change without notice.

Part Numbers

Option UPC MPN
Night Sky/Smoke / 46cm 708752364776 BK6518
Night Sky/Smoke / 49cm 708752364790 BK6519
Night Sky/Smoke / 52cm 708752364813 BK6520