Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Frame geometry
2021 Rocky Mountain Altitude Alloy 50 has 9 mm more reach than 2025 Rocky Mountain Altitude Alloy 50 in the selected sizes.
More reach puts the head-tube reference farther forward, not necessarily the hands.
- Handling
2025 Rocky Mountain Altitude Alloy 50 has a 2.4° slacker head-tube angle than 2021 Rocky Mountain Altitude Alloy 50 in the selected sizes.
Fork offset, tire size and wheelbase also affect steering; head angle alone is not a handling verdict.
- Identity & price
2021 Rocky Mountain Altitude Alloy 50 had an original MSRP $310 lower than 2025 Rocky Mountain Altitude Alloy 50.
Original MSRP is the published list price when new, not today’s used-bike value.
Selected-size geometry
Geometry overlay
Frames share one scale and a bottom-bracket alignment. Size labels differ by brand; schematic drawing aids are identified below.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Lowest0.63:1Highest3.20:1Total range510%
Estimated speed at 90 RPMLowest gearHighest gear
Rear tire: 2.4″ + 29-inch.
Lowest0.63:1Highest3.20:1Total range510%
Estimated speed at 90 RPMLowest gearHighest gear
Rear tire: 2.4″ + 29-inch.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
2021 Rocky Mountain Altitude Alloy 50
2025 Rocky Mountain Altitude Alloy 50
Overview
Model Year
2021
2025
Brand
Rocky Mountain
Rocky Mountain
Model
Altitude Alloy 50
Altitude Alloy 50
Bicycle Type
Mountain
Mountain
Original MSRP
$4,489.00
$4,799.00
Colors
Purple/Black, Black/Brown
Purple/Red
Sizes
S, M, L, XL
S, M, L, XL
Weight
34.562 LBS|15.71 KGS
—
Frameset
Frame Construction
FORM™ Alloy. Full Sealed Cartridge Bearings. Press Fit BB. Internal Cable Routing. 2-Bolt ISCG05 Tabs. RIDE-9™ Adjustable Geometry. 2 Position Axle. 160mm Travel. FORM™ Alloy Rear Triangle
FORM™ Alloy | Full Sealed Cartridge Bearings | Threaded BB | Internal Cable Routing | 2-Bolt ISCG05 Tabs | RIDE-4™ Adjustable Geometry | 160mm Travel | FORM™ Alloy Rear Triangle
Frame Material
Aluminum
Aluminum
Fork
Fox 36 Float EVOL GRIP Performance Series 170mm | 27.5 = 37mm Offset | 29 = 44mm Offset
Fox 38 Float EVOL GRIP Performance Series 170mm | 27.5 = 37mm Offset | 29 = 44mm Offset
Rear Shock
Fox Float DPX2 Performance | Sealed Bearing Eyelet | SM = 210x55mm | MD - LG - XL = 230x60mm
Fox Float X Performance | Sealed Bearing Eyelet | 40x10mm F Hardware | SM = 210x55mm | MD - LG - XL = 230x60mm | Size-Specific tune in FAQ
Drivetrain
Shifters
Shimano SLX
Shimano SLX
Rear Derailleur
Shimano XT
Shimano XT
Crankset
Race Face Aeffect Cinch | 27.5 = 34T | 29 = 32T
Race Face Aeffect Cinch | 32T | 24mm Spindle | SM = 165mm | MD - XL = 170mm
Bottom Bracket
Shimano SM-BBMT500
Shimano Threaded BBMT501-B
Cassette
Shimano Deore 10-51T 12spd
Shimano Deore 10-51T 12spd
Chain
Shimano M6100
Shimano M6100
Brakes
Brakes
Shimano XT Trail 4 Piston
Shimano SLX Trail 4 Piston | Metal Pads
Cockpit & Contact Points
Headset
FSA Orbit NO.57E
FSA ZS56/66 Reach Adjust | 0mm Cups Installed | +/- 5mm Cups Included | Sealed Stainless 36°x45° Bearings | 30.2mm x 41mm x 6.5mm Upper | 40mm x 51.8mm x 8.0mm Lower | 1.5" Crown Race
Handlebar
Rocky Mountain AM 780mm
Rocky Mountain AM | 780mm Width | 38mm Rise | 9° Backsweep | 5° Upsweep | 35 Clamp
Stem
Rocky Mountain 35 AM | 40mm
Rocky Mountain 35 AM | 0° Rise | All Sizes = 40mm
Saddle
WTB Volt Race 142
WTB Solano Fusion Form 142 | Cromoly Rails
Seatpost
Race Face Aeffect R Dropper 30.9mm | Shimano MT500 Remote | SM = 125mm | MD = 150mm | LG - XL = 175mm
X Fusion Manic Composite 30.9mm | SM = 150mm | MD = 170mm | LG - XL = 200mm
Wheels & Tires
Hubs
Front: Rocky Mountain Sealed Boost 15mm; Rear: DT Swiss 370 Boost 148mm
Front: Novatec D791SB Sealed Boost 15mm; Rear: Shimano XT Boost 148mm
Rims
WTB ST i30 TCS 2.0 Tubeless / Tubeless Ready - Tape / Valves Incl
WTB ST i30 TOUGH TCS 2.0 | 32H | Tubeless Set Up | Sealant Incl
Spokes
DT Swiss Competition 2.0/1.8/2.0
DT Swiss Competition 2.0/1.8/2.0
Front Tire
Maxxis Assegai 2.5 WT 3C MaxxGrip EXO+ Tubeless Ready
Maxxis Assegai 2.5 WT 3C MaxxGrip EXO+ Tubeless Ready
Rear Tire
Maxxis Minion DHR II 2.4 WT 3C MaxxTerra EXO+ Tubeless Ready
Maxxis Minion DHR II 2.4 WT 3C MaxxTerra DD Tubeless Ready
Wheel Size
29"; 27.5"
SM: 27.5″; MD/LG/XL: 29″
Geometry · choose a size for each bicycle
Geometry size
Reach
484 mm
475 mm
Stack
631 mm
639 mm
Effective top tube
637 mm
610 mm
Head-tube angle
65.4°
63°
Seat-tube angle
76.4°
77°
Seat tube
445 mm
440 mm
Head tube
110 mm
115 mm
Chainstay / rear center
436 - 447
450 mm
Wheelbase
1248 mm
1283 mm
Bottom-bracket drop
22 mm
38 mm
Standover height
818 mm
798 mm
Wheel size
29
29
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.