Fit
Find your size
Sizes overlap on purpose. Between two, the smaller rides more nimble and upright and the larger stretches you out. Every size shares a 450mm chain stay, a 75mm bottom bracket drop and a 45mm fork offset, so handling stays the same across the range.

4130 All-Road Flat Bar Overview
The State Bicycle Co. 4130 All-Road Flat Bar in Mint Chocolate Chip is a steel flat bar gravel bike, and the simple way into the 4130 All-Road. A double butted chromoly frame, a 630mm flat bar with 25mm of rise, 650b wheels on 2.1 inch Vittoria Barzo knobbies, and a 10 speed drivetrain with nothing to charge and nothing to pair.
Every choice points the same way: fewer things to go wrong, fewer things to pay for. The cables run fully outside the frame, the bottom bracket is a threaded 68mm BSA with square taper cranks, and the hanger is UDH, so parts are easy to find and easy to fit. It is as happy in weekday traffic as it is on a dirt road you have never ridden.
Want drop bars instead? The drop bar State 4130 All-Road gravel bike runs a 12 speed drivetrain and your choice of 700c or 650b wheels.
Standards you can fix anywhere
A 68mm BSA threaded bottom bracket, square taper cranks, a 27.2mm seatpost and a 31.8mm bar clamp. Standards with decades of parts behind them, serviceable by any shop.
Thru axles front and rear, 12x100 and 12x142, on sealed bearing hubs. A UDH derailleur hanger, so a replacement after a crash is a part almost any shop can order. And every cable runs outside the frame, where you can see it, adjust it and replace it.
LONG, LOW AND SLACK
The chain stays are 450mm on every size. That long rear end puts your weight further forward between the wheels, so the bike tracks straight on loose surfaces and stays planted when it carries bags.
Up front, a 70.5 to 71.5 degree head angle lets the front wheel lead rather than dart, a 75mm bottom bracket drop sits your weight below the axles, and a 45mm fork offset on every size keeps the steering the same from XS to L. The result is a calm bike on a fire road descent.

WHY A FLAT BAR GRAVEL BIKE
The bar is 630mm wide with 25mm of rise on a 31.8mm clamp. Width gives you leverage over the front wheel on loose ground, and the rise brings your hands up, which opens your back and takes weight off your wrists on a long day.
It also lets you see. Sitting upright in traffic, on a canal path or down a dirt road you have never ridden is worth more than the aerodynamics you give up.


MicroShift Advent X 1x10
An 11 to 46T cassette gives 418% of range. The clutch keeps the chain quiet on rough ground, and the narrow wide 40T ring holds it on without a guide.

Hydraulic Discs, Thru Axles
Sealed hydraulic brakes on 160mm rotors front and rear, with 12mm thru axles and sealed bearing hubs.

Vittoria Barzo 2.1 Inch
Real off road tread on 650b wheels, with room for up to 2.4 inch, or 2.25 inch on a separate 700c wheelset.

Double Butted 4130 Chromoly
Thicker tube walls at the welded ends where stress concentrates, thinner through the middle. Strength where it matters, weight shed everywhere else.
| Frame | Double butted 4130 chromoly steel, UDH dropouts, 12x142mm thru axle |
|---|---|
| Fork | 4130 chromoly steel, 12x100mm thru axle |
| Cable routing | Fully external |
| Bottom bracket | 68mm BSA threaded |
| Headset | SBC 1 1/8 inch threadless, steel |
| Shifter | MicroShift Advent X, 1x10 |
| Rear derailleur | MicroShift Advent X, 10 speed |
| Cassette | 11 to 46T, 10 speed |
| Crankset | SBC 40T narrow wide, aluminum, square taper |
| Chain | 10 speed |
| Brakes | Hydraulic disc, flat mount, 160mm rotors front and rear |
| Rims | 650b double wall, 32 hole |
| Spokes | Stainless steel, 14 gauge |
| Hubs | Sealed bearing, 12x100mm front and 12x142mm rear thru axle |
| Tires | Vittoria Barzo, 650b x 2.1 inch. Not rated tubeless |
| Tire clearance | 650b up to 2.4 inch (60mm). 700c up to 2.25 inch (57mm), on a separate wheelset |
| Handlebar | SBC low rise aluminum, 630mm wide, 25mm rise, 31.8mm clamp |
| Stem | SBC 3D forged alloy, 31.8mm clamp |
| Grips | 135mm TPE |
| Seatpost | SBC aluminum, 27.2mm x 350mm |
| Saddle | PU pad with microfiber cover and steel rails |
| Pedals | Nylon flat pedals, included |
| — Frame geometry — | XS / S / M / L |
| Chain Stay | 450mm / 450mm / 450mm / 450mm |
| Effective Top Tube | 510mm / 535mm / 550mm / 575mm |
| Fork Offset | 45mm / 45mm / 45mm / 45mm |
| Head Tube | 125mm / 145mm / 165mm / 185mm |
| Head Tube Angle | 70.5° / 71° / 71.5° / 71.5° |
| Seat Tube | 430mm / 470mm / 510mm / 550mm |
| Seat Tube Angle | 75° / 74.5° / 73.5° / 73° |
| — Rider height — | 5'1" - 5'6" / 5'5" - 5'10" / 5'9" - 6'2" / 6'1" - 6'5" |
WHAT'S IN THE BOX
4130 All-Road Flat Bar
Flat Pedals
Belcopia Support
Questions before buying
Why a flat bar gravel bike instead of drop bars?+
Flat bars give you leverage and an upright position. This one is 630mm wide with 25mm of rise, so you get more control over the front wheel on loose ground and less weight on your wrists. If you want drops, the drop bar State 4130 All-Road gravel bike runs a 12 speed drivetrain and a choice of 700c or 650b wheels.
Is 10 speed enough?+
For range, yes. The 11 to 46T cassette gives 418% of range: a climbing gear for loaded dirt and enough at the top for a fast flat section. More speeds would give smaller steps between gears, not more range, and they cost more every time you replace a chain or cassette.
Are the tires tubeless?+
The Vittoria Barzo tires are not rated tubeless. It may be possible to set them up that way, but State cannot guarantee it and recommends professional assembly for any tubeless setup.
Can I fit bigger tires or 700c wheels?+
Yes. The frame clears 650b tires up to 2.4 inch (60mm), more than the 2.1 inch it ships on. It also takes 700c tires up to 2.25 inch (57mm), though that needs a separate wheelset.
Which size State 4130 All-Road Flat Bar should I choose?+
XS fits riders 5'1" to 5'6", S 5'5" to 5'10", M 5'9" to 6'2" and L 6'1" to 6'5". The sizes overlap on purpose. Between two, the smaller one rides more nimble and upright, and the larger one stretches you out. Reach, stack and standover for every size are in the fit chart.
What does UDH mean?+
Universal Derailleur Hanger. It is a shared standard, so a replacement hanger is available at almost any shop, with no proprietary part to track down after a crash on a trip. It also leaves a clear path to newer drivetrains later.
Authorized Dealer for the World's Toughest






