2026 Polygon Siskiu T T8 UDH vs 2025 Trek Fuel EX
The Trek Fuel EX size closest to your M is the ML. Compare the ML instead
What changes on the Trek Fuel EX
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- n/a
- One of the bikes has no number for this
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Only the Polygon Siskiu T T8 UDH is drawn. The Trek Fuel EX numbers we have for size S are missing the reach, stack, seat angle and wheelbase.
Geometry side by side
| Measurement | Polygon Siskiu T T8 UDH M | Trek Fuel EX S | Difference |
|---|---|---|---|
| Reach | 465 | not listed | |
| Stack | 609 | not listed | |
| Head tube angle | 64.5 | 64.5 | ±0.0° |
| Seat tube angle | 71.2 | not listed | |
| Effective top tube | 595 | not listed | |
| Chainstay length | 430 | 435 | +5 mm |
| Wheelbase | 1214 | not listed | |
| BB height | 337.5 | not listed | |
| Standover | 705 | not listed | |
| Seat tube length | 400 | not listed | |
| Head tube length | 95 | not listed | |
| BB drop | not listed | not listed |
Differences are the Trek Fuel EX minus the Polygon Siskiu T T8 UDH. Full charts: 2026 Polygon Siskiu T T8 UDH, 2025 Trek Fuel EX.
Where each sits in its class
Polygon Siskiu T T8 UDHTrek Fuel EX
AggressivePositionUpright
CalmSteeringQuick
PlayfulBalancePlanted
Each bike is ranked against the other trail bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Polygon Siskiu T T8 UDHT8 with UDH | Trek Fuel EX5 |
|---|---|---|
| Frame | Polygon ALX Trail | Trek Fuel EX |
| Fork | Fox 34 Performance | RockShox Recon Silver |
| Rear shock | Fox Float | X-Fusion Pro 2 |
| Shifter | Shimano SLX M7100 | Shimano Deore M6100 |
| Derailleur | Shimano SLX M7100 | Shimano Deore M6100 |
| Cassette | Shimano SLX M7100 | Shimano Deore M6100 |
| Chain | KMC X-12 | Shimano Deore M6100 |
| Crankset | Shimano Deore M6120 | Shimano MT512 |
| Wheelset | Polygon MT6 | Bontrager Line TLR 30 |
| Tire | Maxxis Dissector | Bontrager Gunnison Elite XR |
| Brake | Shimano Deore M4100 | Shimano MT200 |
| Rotor | Shimano SM-RT54 | Shimano SM-RT56 |
| Handlebar | Polygon EXPERT | TranzX JD-YSI-22PLQ |
| Stem | Polygon EXPERT | Bontrager Comp |
| Headset | FSA No 57E | not listed |
| Dropper post | X-Fusion MANIC LC | TranzX JD-YSI-22PLQ |
| Saddle | Linc XTENT | Bontrager Arvada |
| Bottom bracket | not listed | Shimano MT501 |
| Grips | not listed | Bontrager XR Trail |
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