2026 Transition Spire Carbon vs 2026 Santa Cruz Megatower
The M is the Santa Cruz Megatower size closest to your M Transition Spire Carbon. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Santa Cruz Megatower
Compared with the Transition Spire Carbon in M, the Santa Cruz Megatower in M places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 23 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +1 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- −23 mm
- Shorter: quicker to change direction
- Head angle
- +1.3°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Transition Spire Carbon is drawn. The Santa Cruz Megatower numbers we have for size M are missing the chainstay length.
Geometry side by side
| Measurement | Transition Spire Carbon M | Santa Cruz Megatower M | Difference |
|---|---|---|---|
| Reach | 455 | 455 | ±0 mm |
| Stack | 624 | 625 | +1 mm |
| Head tube angle | 62.5 | 63.8 | +1.3° |
| Seat tube angle | 78.3 | 77.42 | −0.9° |
| Effective top tube | 580 | not listed | |
| Chainstay length | 448 | not listed | |
| Wheelbase | 1259 | 1236 | −23 mm |
| BB drop | 32 | 26.5 | −6 mm |
| BB height | 343 | 346 | +3 mm |
| Seat tube length | 390 | 405 | +15 mm |
| Head tube length | 100 | 100 | ±0 mm |
| Standover | not listed | 716 |
Differences are the Santa Cruz Megatower minus the Transition Spire Carbon. Full charts: 2026 Transition Spire Carbon, 2026 Santa Cruz Megatower.
Where each sits in its class
Transition Spire CarbonSanta Cruz Megatower
Each bike is ranked against the other enduro 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 | Transition Spire CarbonCarbon Eagle 90 | Santa Cruz Megatower70 |
|---|---|---|
| Frame | Transition Spire | Santa Cruz Megatower |
| Fork | RockShox Zeb Ultimate Charger 3 RC2 | RockShox ZEB Base |
| Rear shock | RockShox Vivid Ultimate | Fox Float X Performance |
| Shifter | SRAM Eagle AXS | SRAM Eagle 70 Transmission |
| Derailleur | SRAM Eagle 90 Transmission | SRAM Eagle 70 Transmission |
| Cassette | SRAM GX Eagle Transmission | SRAM NX Eagle |
| Chain | SRAM GX Eagle Transmission | SRAM Eagle 70 Transmission |
| Crankset | SRAM Eagle 90 Transmission | SRAM Eagle 70 Transmission |
| Chainring | SRAM Eagle AXS | SRAM Eagle 70 Transmission |
| Wheelset | DT Swiss EX1700 SPLINE 30 | Reserve 30|TR AL |
| Tire | Schwalbe Magic Mary Radial, Schwalbe Albert Radial | Maxxis Assegai, Maxxis Minion DHR II DD |
| Brake | SRAM Maven Silver Stealth | SRAM DB8 Stealth |
| Rotor | SRAM CenterLine | Avid Centerline |
| Handlebar | Burgtec Ride Wide Alloy Enduro | Burgtec Alloy |
| Stem | Burgtec Enduro MK3 35 | OneUp Components Enduro |
| Grips | ODI Longneck V2.1 | not listed |
| Headset | FSA NO.55R/57 | not listed |
| Dropper post | OneUp Components dropper post | SDG Tellis Dropper |
| Saddle | SDG Bel Air 3 | SDG Bel Air V3 |
| Bottom bracket | not listed | SRAM DUB 73mm MTB Wide BB |
| Seatpost | not listed | SDG Tellis |
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