The Strummer Unbound CF frameset is designed to deliver maximum performance on 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 frame production process on the front and rear makes this frame more precise and stiff.
The design of the top tube is designed with a vibration dampening zone that can dampen vibrations, so it will feel comfortable when passing through gravel routes.
Unbound CF Strummer Frame Specifications
Compatible Seatpost Diameter: 27.2 mm Round
Carbon Material: T700
Maximum Tire Clearance: 700c, Fork 45 mm Width (Front), Frame 50 mm Width (Rear).
Headset Size: Diameter 44/52 Full Integrated
Cable Routing: Full Internal Cable Frame & Fork
Weight: Fork Internal Cable with 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: Due to the handmade Carbon Frame and Fork manufacturing process, there may be differences in weight between each product.
Strummer Unbound CF Fork Specifications
Weight (Including 6 Bolts & Thru Axle): 530 grams (Internal Cable), 530 grams (External Cable). Weight will be lighter after cutting the steerer tube according to needs.
Material: Toray T700 Carbon Fiber
Compatible Tire Size: Maximum 700c (Max 45 mm Width, Road Style Tire, Tire Motive can affect clearance)
Braking System: Disc Brake (Flat Mount)
Suitable Hub Size: 12x100mm (Thru Axle)
Tru Axle: Total Length 125 mm, P1.5 (11 mm)
Steerer Tube Diameter: 28.6 mm, 39.8 mm at the Taper Below
Extra Mounting: 3 Bolts On Each Side (Bolt Spacing 64 mm, Standard Bottle Cage)
Frameset Geometry
| Specification | 490 | 520 | 550 |
| Seatpost Insert Length | 180mm | 220mm | 250mm |
| Reach | 374.1 mm | 377.5 mm | 386 mm |
| Top Tube Length (Horizontal) | 535mm | 550mm | 575mm |
| Stack | 542.6 mm | 563.4 mm | 598.6 mm |
| Wheelbase | 1008.9 mm | 1014.5 mm | 1029.6 mm |
| Chainstay Length | 430mm | 430mm | 430mm |
| Front Center | 593.8 mm | 599.4 mm | 614.5 mm |
| Bottom Bracket Drop | 70mm | 70mm | 70mm |
| Bottom Bracket Height | 285mm | 285mm | 285mm |
| Seat Tube Angle | 73.5° | 73° | 72.5° |
| Head Tube Angle | 71° | 71.5° | 72° |
| Seat Tube Length | 490mm | 520mm | 550mm |
| Head Tube Length | 120mm | 140mm | 175mm |
| Bike Standover Height (700x53c) | 776.4 mm | 793.4 mm | 833.4 mm |
| Bike Standover Height (650B*2.1") | 766.4 mm | 783.4 mm | 823.4 mm |
| Fork Rake / Offset | 50mm | 50mm | 50mm |
| Fork Length | 397 mm | 397 mm | 397 mm |
| Trail | 69.3 mm | 66.1 mm | 62.7 mm |
Sizing Guide
Size 490 (Small) = Height 155-165 cm
Size 520 (Medium) = Height 165-175 cm
Size 550 (Large) = Height 175-183 cm
The above measurements are only a starting point. Please pay attention to the frame geometry to get a more accurate measurement. More accurate measurements require inseam, total height, and arm length. These measurements will affect the components that need to be purchased to complete this frameset. Rider flexibility also needs to be taken into account.
Examples of Bikes/Frames Compatible with Strummer Unbound CF (Taper) Forks
Strummer Unbound CF Gravel Carbon Frameset (2024)
Polygon Bend R2 (2024)
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