2020 Specialized Enduro Expert vs 2021 Rocky Mountain Altitude Alloy
The 29 L is the Rocky Mountain Altitude Alloy size closest to your S4 Specialized Enduro Expert. 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 Rocky Mountain Altitude Alloy
Compared with the Specialized Enduro Expert in S4, the Rocky Mountain Altitude Alloy in 29 L places the top of the head tube at about the same height and 3 mm further back, relative to the bottom bracket. Its wheelbase is 26 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +2 mm
- About the same height
- Frame reach
- −3 mm
- Shorter frame reach
- Wheelbase
- −26 mm
- Shorter: quicker to change direction
- Head angle
- +1.5°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Enduro Expert is drawn. The Rocky Mountain Altitude Alloy numbers we have for size 29 L are missing the chainstay length.
Geometry side by side
| Measurement | Specialized Enduro Expert S4 | Rocky Mountain Altitude Alloy 29 L | Difference |
|---|---|---|---|
| Reach | 487mm | 484 | −3 mm |
| Stack | 629mm | 631 | +2 mm |
| Head tube angle | 63.9° | 65.4 | +1.5° |
| Seat tube angle | 76° | 76.4 | +0.4° |
| Chainstay length | 442mm | not listed | |
| Wheelbase | 1274mm | 1248 | −26 mm |
| Seat tube length | 440mm | not listed | |
| Head tube length | 110mm | not listed | |
| Effective top tube | not listed | not listed | |
| BB drop | not listed | not listed | |
| Standover | not listed | not listed |
Differences are the Rocky Mountain Altitude Alloy minus the Specialized Enduro Expert. Full charts: 2020 Specialized Enduro Expert, 2021 Rocky Mountain Altitude Alloy.
Where each sits in its class
Specialized Enduro ExpertRocky Mountain Altitude Alloy
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 | Specialized Enduro ExpertExpert | Rocky Mountain Altitude AlloyAlloy 30 |
|---|---|---|
| Fork | Fox Float 36 Performance | Marzocchi Z1 |
| Rear shock | Fox Float DPX2 Performance | Fox Float Performance |
| Shifter | SRAM X01 Eagle | Shimano Deore |
| Derailleur | SRAM X01 Eagle | Shimano Deore |
| Cassette | SRAM GX Eagle | Shimano Deore XT |
| Chain | SRAM GX Eagle | Shimano Deore M6100 |
| Crankset | SRAM Descendant | Shimano Deore XT |
| Bottom bracket | SRAM DUB | Shimano SM-BBMT500 |
| Wheelset | Roval Traverse | Shimano MT410 |
| Tire | Specialized Butcher | Maxxis Minion DHF, Maxxis Minion DHR II DD |
| Hub | DT Swiss 370 | not listed |
| Brake | SRAM Code RSC | Shimano MT4120 |
| Grips | Specialized Sip Grip | Ergon GE10 EVO |
| Seatpost | X-Fusion Manic | not listed |
| Saddle | Specialized Bridge 155 S2 | WTB Volt |
| Frame | not listed | Rocky Mountain FORM™ Alloy |
| Rotor | not listed | Shimano SM-RT64 |
| Handlebar | not listed | Rocky Mountain AM |
| Stem | not listed | Rocky Mountain AM |
| Headset | not listed | FSA Orbit 57E |
| Dropper post | not listed | Rocky Mountain Toonie Drop |
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