2027 Polygon Siskiu T T27 EVO vs 2025 Transition Scout Alloy
The Transition Scout Alloy size closest to your XS is the XS. Compare the XS instead
What changes on the Transition Scout Alloy
Compared with the Polygon Siskiu T T27 EVO in XS, the Transition Scout Alloy in S places the top of the head tube 10 mm higher and 15 mm further forward, relative to the bottom bracket. Its wheelbase is 39 mm longer, which can contribute to stability at speed.
- Frame stack
- +10 mm
- Higher front end
- Frame reach
- +15 mm
- Longer frame reach
- Wheelbase
- +39 mm
- Longer: steadier at speed
- Head angle
- −1.0°
- Slacker: calmer steering
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Polygon Siskiu T T27 EVO, XSTransition Scout Alloy, SDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Polygon Siskiu T T27 EVO XS | Transition Scout Alloy S | Difference |
|---|---|---|---|
| Reach | 420 | 435 | +15 mm |
| Stack | 579.87 | 590 | +10 mm |
| Head tube angle | 65 | 64.0 | −1.0° |
| Seat tube angle | 71 | 72 | +1.0° |
| Effective top tube | 559.2 | 564 | +5 mm |
| Chainstay length | 425 | 430 | +5 mm |
| Wheelbase | 1146.4 | 1185 | +39 mm |
| BB height | 335 | 337 | +2 mm |
| Standover | 666 | 665 | −1 mm |
| Seat tube length | 375 | 360 | −15 mm |
| Head tube length | 90 | 110 | +20 mm |
| BB drop | not listed | 18 |
Differences are the Transition Scout Alloy minus the Polygon Siskiu T T27 EVO. Full charts: 2027 Polygon Siskiu T T27 EVO, 2025 Transition Scout Alloy.
Where each sits in its class
Polygon Siskiu T T27 EVOTransition Scout Alloy
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 T27 EVOT27 EVO | Transition Scout AlloyAlloy Deore |
|---|---|---|
| Frame | Polygon ALX Trail | Transition Scout |
| Fork | RockShox Recon Silver TK | RockShox Psylo Gold |
| Rear shock | RockShox Deluxe Select+ | RockShox Deluxe Select+ |
| Shifter | Shimano Deore M6100 | Shimano Deore |
| Derailleur | Shimano Deore M6100 | Shimano Deore |
| Cassette | Shimano Deore M6100 | Shimano Deore M6100 |
| Chain | KMC X-12 | Shimano Deore XT |
| Crankset | Shimano Deore M6120 | Shimano Deore M6100 |
| Chainring | Shimano 32 | not listed |
| Bottom bracket | Shimano | not listed |
| Pedals | Alloy | not listed |
| Wheelset | Polygon MT6 | Novatec D791SB/D902SB with WTB ST i30 |
| Tire | Maxxis Dissector | Maxxis Minion DHR II DD |
| Brake | Shimano Deore M4100 | Shimano Deore XT |
| Rotor | Shimano SM-RT54 | Shimano Deore M6120 |
| Handlebar | Polygon EXPERT | Race Face Chester |
| Stem | Polygon EXPERT | Race Face Aeffect R |
| Headset | FSA No 57E | FSA 57E |
| Dropper post | X-Fusion Manic | SDG Tellis Dropper |
| Seatpost | Dropper Post | not listed |
| Saddle | fizik Terra Alpaca X5 | SDG Bel Air 3 |
| Grips | not listed | ODI Elite Flow |
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