The Strummer Unbound CF frameset is designed to deliver maximum performance on smooth roads (tarmac) and gravel. It is manufactured with Toray T700 and designed with a shape that provides extra strength.
The asymmetrical chainstay design increases stiffness on the drive side, improves stability on the non-drive side, and increases clearance for larger chainrings. The monocoque production process for the front and rear sections makes this frame more precise and stiff.
The top tube is designed with a vibration-dampening zone that reduces vibration, providing a comfortable ride on gravel routes.
Frame Only variant, fork not included.
Strummer Unbound CF Frame Specifications
Compatible Seatpost: 27.2 mm Round Shape, Internal-cable dropper posts can be used.
Carbon Material: T700.
Maximum Tire Clearance: 700c, Fork 45 mm Width (Front), Frame 50 mm Width (Rear).
Headset Size: 44/52 mm Diameter, Fully Integrated
Bottom Bracket Compatibility: Pressfit 41 mm, Recommended: Strummer Press Threaded BB
Cable Routing: Full Internal Cable Routing for Frame & Fork
Weight: Fork with Internal Cable Routing and Front 12x100 Thru Axle (545 grams), Frame Parts & 12x142 Thru Axle (74 grams), Headset (170 grams), Frame Only ST490/ST520 (1040/1090 grams). Total Weight ST490/ST520 (1829/1879 grams).
Note: Because the frame and carbon fork are handmade, weight variations may occur between individual products.
Strummer Unbound CF Fork Specifications
Weight (Including 6 Bolts & Thru Axle): 530 grams (Internal Cable), 530 grams (External Cable). The weight will be lower after cutting the steerer tube to the required length.
Material: Toray T700 Carbon Fiber
Compatible Tire Size: Maximum 700c (Max 45 mm Width, Road-Style Tire, Tire tread can affect clearance)
Braking System: Disc Brake (Flat Mount)
Compatible Hub Size: 12x100 mm (Thru Axle)
Thru-Axle: Total Length 125 mm, P1.5 (11 mm)
Steerer Tube Diameter: 28.6 mm, 39.8 mm at the Tapered Section Below
Extra Mounting: 3 Bolts on Each Side (64 mm Bolt Spacing, Standard Bottle Cage)
Strummer Traverse CF2 Geometry
| Specifications | 490 | 520 | 550 |
|---|---|---|---|
| Seatpost Insert Length | 180 mm | 220 mm | 250 mm |
| Reach | 374.1 mm | 377.5 mm | 386 mm |
| Effective Top Tube Length | 535 mm | 550 mm | 575 mm |
| Stack | 542.6 mm | 563.4 mm | 598.6 mm |
| Wheelbase | 1,008.9 mm | 1,014.5 mm | 1,029.6 mm |
| Chainstay Length | 430 mm | 430 mm | 430 mm |
| Front Center | 593.8 mm | 599.4 mm | 614.5 mm |
| Bottom Bracket Drop | 70 mm | 70 mm | 70 mm |
| Bottom Bracket Height | 285 mm | 285 mm | 285 mm |
| Seat Tube Angle | 73.5° | 73° | 72.5° |
| Head Tube Angle | 71° | 71.5° | 72° |
| Seat Tube Length | 490 mm | 520 mm | 550 mm |
| Head Tube Length | 120 mm | 140 mm | 175 mm |
| Standover Height with 700 × 50c Tires | 776.4 mm | 793.4 mm | 833.4 mm |
| Standover Height with 650B × 2.1-inch Tires | 766.4 mm | 783.4 mm | 823.4 mm |
| Fork Rake / Offset | 50 mm | 50 mm | 50 mm |
| Axle-to-Crown | 399 mm | 399 mm | 399 mm |
| Trail | 69.3 mm | 66.1 mm | 62.7 mm |
Size Selection Guide
| Size | Recommended Rider Height | Estimated Minimum Inseam |
|---|---|---|
| 490 / Small | 165–174 cm | Approximately 79 cm |
| 520 / Medium | 172–180 cm | Approximately 81 cm |
| 550 / Large | 180–186 cm | Approximately 85 cm |
The height ranges overlap because size selection is also influenced by inseam length, torso, arm length, body flexibility, and desired riding position.
Prioritize inseam length and standover clearance. As a guide, leave approximately 20–30 mm between your crotch and the top tube when standing over the bicycle.
If your height falls within an overlapping range:
-
Choose a smaller size for a lower position and more agile handling.
-
Choose a larger size for a higher front-end position and more stable riding characteristics.
Stem size, crank length, handlebar width, number of spacers, and saddle position can also affect comfort and riding position.
Examples of Bicycles/Frames Compatible with the Strummer Unbound CF Fork (Tapered)
Strummer Unbound CF Gravel Carbon Frameset (2024)
Polygon Bend R2 (2024)
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