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Nature Boy

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The Nature Boy is our singlespeed cross monster. It’s as popular on the race course as it is on the city streets.

It carries on the tradition of classic steel cross bikes, with the addition of our standard AC hallmarks: beautiful lugged fork crown, internal cable routing, Hennepin Bridge dropouts, signature brazed-on seat collar, custom BB shell and our signature head badge. Everything is E.D. coated for longevity and rust prevention.

Since cross bikes are perfect for everyday living, you’ll find hidden fender mounts and two sets of bottle bosses (reinforced of course). There’s clearance for 38c tires with plenty of room for mud. The steel fork is easily swapped for a carbon model, should you want to lighten up for race season. 

Race the heck out of it, ride singletrack, crush gravel or commute to your heart’s content. 

Nature Boy -

612 Select Tubing

Our proprietary blend of 4130 double-butted CroMoly tubes. Every piece of tubing on every frame size has been carefully chosen to provide the best ride possible.

E.D. Coating

In Electrophoretic Deposition, or E.D., coating the frame or fork is placed in a paint bath where an electric charge is applied. This fuses a thin layer of black satin coating to the tubes inside and out. This coating acts as both a rust preventative inside and a primer out.

Custom Details

We’re way into the handbuilt touches when it comes to our frames. Which is why you’ll find things like internal cable routing, custom dropouts, lugged crown forks, reinforcements on the bottle bosses, hidden fender mounts, etc on our framesets.

Signature Dropouts

Our signature horizontal dropout has become one of our calling cards. It functions superbly, looks way cool, and the adjustment screw allows the use of quick release wheels.

Frame + 612 Select ChroMoly steel. Double butted down, top, and seat tubes. Externally tapered, ovalized, and dimpled chain stays, tapered seat stays
Fork + 4130 ChroMoly tapered fork blades, lugged crown and matching dropout. Straight steertube
Rear spacing + 130mm
Brake Compatibility + Cantilever, Linear Pull
Seatpost diameter + 27.2
Steertube/Headset + 1-1/8" threadless, EC34 upper & lower, Crown race 30.0
Bottom Bracket Shell + 68mm English
Chainring clearance + 49 Tooth max
Tire clearance + 700x38
Extras + Fender Mounts, ED coated
Headset + Cane Creek 10 series
Stem + Salsa Guide, 1-1/8" threadless, 31.8mm clamp
Handlebar + Salsa Cowbell 3, 31.8mm
Tape + Black Cork
Brake Lever + Tektro RL340
Brakeset + Tektro Mini-V
Crankset + FSA Vero, 42t
Bottom Bracket + Square Taper, 68x110mm steel cups, sealed bearings
Seatpost + 27.2mm, 350mm Length
Saddle + All-City Gonzo
Freewheel + 17t, 3/32
Chain + KMC Z610
Hubs + All-City Standard Fix/Free, 32h
Rims + Alex XC23 32h
Tires + Kenda Small Block Eight 700c x 35mm steel bead
Nature Boy Geometry Line Drawing
Select up to 3 sizes to view:
46cm
49cm
52cm
55cm
58cm
61cm

Size 46cm 49cm 52cm 55cm 58cm 61cm
Head Tube Angle (A) 70.5 71 71.5 72 72.5 72.5
Seat Tube Angle (B) 74 73.5 73 73 72.5 72.5
Top Tube Length (C) 520 535 550 565 585 605
Seat Tube Length (D) 460 490 520 550 580 610
Chainstay Length (E) 415 420 420 420 420 420
Bottom Bracket Drop (F) 70 70 70 70 70 70
Fork Offset (G) 45 45 45 45 45 45
Total Fork Length (H) 395 395 395 395 395 395
Head Tube Length (I) 95 110 130 150 175 200
Standover (J) 756 778 802 827 853 880
Wheelbase (K) 985.7 997.4 1003.6 1014.4 1024.2 1044.2
Stack (L) 526.2 542.2 563 583.9 609.6 633.4
Reach (M) 369.1 374.4 377.9 386.5 392.8 405.3
Handlebar Width 40 40 42 42 44 44
Stem Length 80 90 100 100 110 120
Crank Arm Length 170 170 175 175 175 175
BK8900 Complete 46cm
BK8901 Complete 49cm
BK8902 Complete 52cm
BK8903 Complete 55cm
BK8904 Complete 58cm
BK8905 Complete 61cm
FM9700 Frameset 46cm
FM9701 Frameset 49cm
FM9702 Frameset 52cm
FM9703 Frameset 55cm
FM9704 Frameset 58cm
FM9705 Frameset 61cm