Description
The 4130 Trail Frame & Fork Set is the perfect foundation for your next hardtail shredder. Made from double-butted 4130 Chromoly steel, this frame is built to take a beating while delivering a smooth, lively ride feel. With progressive trail geometry, UDH compatibility, and clearance for big rubber, it’s ready for anything from techy singletrack to loaded bikepacking missions.
Quick Features:
- Progressive Trail Geometry: A slack 65° head angle, low-slung top tube, and long front-center keep things stable when the trail gets rowdy while maintaining playful agility in the corners.
- Universal Derailleur Hanger (UDH) Compatibility: Future-proofed for modern drivetrain tech and easier maintenance, because you don’t need to be stressing parts availability.
- Double-Butted 4130 Chromoly Steel Frame: Tougher than aluminum and smoother than carbon, our double-butted 4130 Chromoly frame absorbs trail chatter and takes a beating without flinching.
- Internal Dropper Routing: With a 31.6mm seat tube and internal cable routing, upgrading to a dropper post is hassle-free.
- Threaded Bottom Bracket (73mm BSA): Reliable, creak-free, and easy to service.
- More Mounting Points: Triple bottle cage mounts on the downtube — because adventure doesn’t come with limits.
- Three Forks Fit: Build it rigid with our steel or carbon MTB fork, or suspended with the RockShox Psylo Silver RC (130mm travel, 35mm stanchions). Add one above — see Choose Your Fork below for what each one does to the bike.
Choose Your Fork
This is a frameset — the fork is sold separately. Add one above and it ships with the frame, or leave it off and run a fork you already have. Three forks fit, and they build into three genuinely different bikes.
Option
No Fork
+$0.00
Frame only. For a fork you already own or one you’re sourcing yourself.
- Tapered head tube, ZS44 / ZS56
- Match 550mm axle-to-crown for stock geometry
Rigid
Steel Rigid MTB Fork
+$179.99
Double-butted 4130 chromoly. The load-hauler — more bolt-on real estate than any fork we build.
- 492mm A2C · 50mm offset
- 29 x 3.0″ max tire
- 5 cargo mounts per leg, plus fender and rack mounts
- 180mm brake adaptor included
- 4 lb 0 oz
Rigid
Carbon Rigid MTB Fork
+$349.99
563 grams, and it clears a 32-inch wheel — almost nothing does.
- 495mm A2C · 49mm offset
- 29 x 3.0″ max tire, or 32 x 2.4″
- 3 cargo mounts per leg, rack mounts
- No fender mounts · 180mm adaptor not included
- 1 lb 6 oz with axle
Suspension
RockShox Psylo Silver RC
+$385.00
130mm of travel on 35mm steel uppers. The fork the frame’s geometry was drawn around.
- 550mm A2C · 44mm offset
- 29 x 2.6″ max tire
- Motion Control damper, Solo Air spring
- 5 lb 12 oz
The rigid forks change the geometry, on purpose. Both are 55–58mm shorter axle-to-crown than the Psylo. That steepens the head angle, drops the bottom bracket and shortens the wheelbase — the bike gets quicker-steering and sits lower. It’s an intentional conversion from slack trail hardtail to fast all-terrain bike, not a compromise, but go in expecting a different bike rather than the same one minus the squish. Published geometry on this page is measured with the 550mm suspension fork.
| Fork | Axle-to-crown | Offset | Max tire | Weight | Add |
|---|---|---|---|---|---|
| RockShox Psylo Silver RC | 550mm | 44mm | 29 x 2.6″ | 5 lb 12 oz | +$385.00 |
| Carbon Rigid | 495mm | 49mm | 29 x 3.0″ · 32 x 2.4″ | 1 lb 6 oz | +$349.99 |
| Steel Rigid | 492mm | 50mm | 29 x 3.0″ | 4 lb 0 oz | +$179.99 |
| No fork | — | — | — | — | +$0.00 |
All three forks are 15 x 110mm Boost with the thru-axle included, post mount brakes, and a 300mm steerer shipped uncut on the rigid options. The steel fork’s straight 1-1/8″ steerer ships with a 30mm cone so it runs in this frame’s tapered head tube — no reducer headset needed. Frame clearance is 29″ up to 2.6″ or 27.5″ up to 3.0″; fork clearance is listed above and is the limit on the front.
Build and Customize
FRAME SIZE:
- XS/S: 5’1″ to 5’5″
- S/M: 5’5″ to 5’10”
- M/L: 5’10” to 6’1″
- XL: 6’1″ to 6’5″
Also Included:
- Headset
- Thru-Axles Front & Rear
- Universal Derailleur Hanger
- Cable Guides
- Quick Release Seatpost Clamp
- *Frame and Forks Sold Separately – be sure to add the fork as an option or a la carte to receive both*
MAX TIRE CLEARANCE:
- Frame: 29” Wheels: Up to 2.6” / 27.5” Wheels: Up To 3.0”
- Fork: Depends on the fork you choose — see the comparison table above
