Details
LIGHT. STIFF. FOCUSED.
The Syncline DR platform is built around a full-carbon frame engineered for high torsional stiffness and efficient power transfer. Its single-pivot design with a flex-stay rear triangle and compact rear center gives immediate, predictable trail feedback—rewarding precision, cadence, and rider input over excess suspension softness.
CONTROLLED EFFICIENCY
Polygon’s contemporary XC geometry blends a 67.5° head angle, 75° seat angle, and 440 mm chainstay with 120 / 110 mm of balanced travel. The chassis rides high in its stroke for pedaling efficiency yet stays active across roots and chatter, maintaining traction through rough climbs and off-camber turns—calm, composed, and predictably fast.
RACE-READY RELIABILITY
Every Syncline DR frame uses service-friendly standards: a BSA 73 mm threaded bottom bracket, Boost 148 mm rear spacing, and a UDH hanger for straightforward drivetrain swaps. Quiet internal routing and sealed pivot hardware reduce maintenance, keeping performance consistent through full-season race mileage.
INDUSTRY REVIEW
"The Syncline DR is every bit a race bike, built for speed and performance from the ground up. Polygon has done a great job with the frame and the componentry, delivering a package that feels sharp, snappy, and fast." - Flow Mountain Bike
Specs
| frameset | |
|---|---|
| Frame | ACX Full Carbon XC Frame, 110mm Rear Travel, BSA Threaded 73mm BB Shell, UDH Compatible, Internal Brake and Shifter Routing, ISCG Mount, Boost 12x148mm Thru Axle, Disc Brake Post Mount 160mm |
| Headset | FSA NO.69/59/SRS/DUAL, IS52/28.6 | IS52/40 |
| suspension | |
| Fork | Fox 34 SL Factory Series, 120mm Travel, 29", Air Spring, GRIP-SL Damper, Rebound Adjust, Remote Lock, Tapered Steerer 1-1/8"–1.5", Boost 15x110mm, Disc Brake Post Mount 180mm |
| Shock | Fox Float SL Factory Series, 165x40mm Trunnion, Air Spring, Rebound Adjust, Remote Lock |
| drivetrain | |
| Rear derailleur | Shimano XTR Di2 RD-M9250, 12-Speed |
| Shifter | Shimano XTR Di2 SW-M9250 I-Spec EV, 1x12-Speed Trigger |
| Crank | Shimano XTR FC-M9200, 170mm (S-M) / 175mm (L-XL) |
| Chainring | 34T, Max Chainring 34T |
| Cassette | Shimano XTR CS-M9200, 10-51T, 12-Speed |
| Chain | Shimano XTR CN-M9100 |
| brakes | |
| Front brake | Shimano XTR BR-M9200, Hydraulic Disc, 2-Piston |
| Rear brake | Shimano XTR BR-M9200, Hydraulic Disc, 2-Piston |
| Rotor | Shimano SM-RT86, Front 180mm / Rear 160mm |
| wheels | |
| Front hub | Race Face Vault 415, Boost 15x110mm, 28H, Center Lock |
| Rear hub | Race Face Vault 424, Boost 12x148mm, 28H, Center Lock, Micro Spline |
| Rim | Race Face Era Carbon, 30mm Internal Width, 28H, Tubeless Ready ** |
| Tyre | Maxxis Rekon Race 29x2.35" |
| Max tyre size | 29x2.35 |
| contact points | |
| Handlebar | FSA KFX Flat Carbon, 760mm Width, 31.8mm Bore, 9° Bend |
| Saddle | Fizik Terra Argo X7, Cr-Mo Ø7mm Rails |
| Seatpost | FOX Transfer SL Factory Series, 31.6x455mm, 125mm Travel, 0mm Offset |
| Stem | FSA KFX 2-Bolt Stem, 70mm Length, 31.8mm Clamp, -20° Rise |
| Pedals | Alloy Flat, With Replaceable Pins |
| weight | |
| Bike weight | 24.6 lbs |
Geo
| Frame Size | S | M | L | XL |
| Rider Height | 5'1"–5'5" | 5'5"–5'9" | 5'9"–6'1" | 6'1"–6'5" |
| (A) Frame Stack (mm) | 587 | 601 | 606 | 615 |
| (B) Frame Reach (mm) | 425 | 450 | 470 | 495 |
| (C) Head Tube Angle (°) | 67.5 | 67.5 | 67.5 | 67.5 |
| (D) Head Tube Length (mm) | 95 | 105 | 115 | 125 |
| (E) Seat Tube Angle (°) | 74.7 | 74.7 | 74.7 | 74.7 |
| Effective Seat Tube Angle (°) | 77.1 | 77.1 | 77.1 | 77.1 |
| (F) Seat Tube Length (mm) | 384 | 432 | 470 | 510 |
| (G) Effective Top Tube (mm) | 571 | 595 | 625 | 653 |
| (H) Bottom Bracket Height (mm) | 334.5 | 334.5 | 334.5 | 334.5 |
| (I) Bottom Bracket Drop (mm) | 38 (Drop) | 38 (Drop) | 38 (Drop) | 38 (Drop) |
| (J) Chainstay Length (mm) | 440 | 440 | 440 | 440 |
| (K) Wheelbase (mm) | 1174 | 1189 | 1206 | 1231 |
| (L) Standover Height (mm) | 725 | 726 | 725 | 725 |
Build
2024 Polygon Siskiu T8
Your bike needs minor assembly before riding; use the tools and videos included.
As a guide, it'll take 10-40min depending on whether you're an experienced bike assembler or have little to no mechanical experience.
Side Note: Your cables will stretch during the initial bed-in period and must be adjusted by an experienced mechanic around 150km of riding.
Unboxing Your Bike
Dial In Your Suspension Setup
Dial In Your Bike Fit
Dial In Your Tyre Pressures
Pre-Ride Check