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2020 Rocky Mountain Thunderbolt Alloy 50

Launched at $3,399Lists today at $3,399 (2026-09)

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What a used one is worth

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New

$1,747

$1,104 to $2,128

Like new

$1,660

$1,049 to $2,022

Excellent

$1,573

$994 to $1,915

Good

$1,311

$828 to $1,596

Fair

$961

$607 to $1,170

For parts

$524

$331 to $638

From the launch price, aged to 2026 and adjusted for condition. Guidance from our catalog, not an appraisal.

Overview

Brand: Rocky Mountain
Model family: Thunderbolt
Model year: 2020
Category: Mountain · trail
Frame material: aluminum
Sizes: XS, S, M, L, XL
Wheel size: 27.5
Launch MSRP (US): $3,399
Current list price: $3,399 (as of 2026-09)

Drivetrain

Speeds: 12
Groupset: Shimano Deore XT
Electronic: false

Build

Fork: Fox 34 Float Performance 140mm 37mm Offset
Stem: Rocky Mountain AM
Tires: Maxxis Minion DHR II WT EXO Tubeless Ready 27.5 x 2.4 / Maxxis Minion DHR II WT EXO Tubeless Ready 27.5 x 2.4
Brakes: Shimano MT500 2 Piston / Shimano RT66 180mm / Shimano RT66 180mm
Saddle: WTB Volt Race 142
Wheels: WTB ST Light i30 TCS 2.0 Tubeless rims; hubs: Rocky Mountain Sealed Boost 15mm / DT Swiss 370 Boost 148mm
Cassette: Shimano SLX 10-51T
Crankset: Race Face Aeffect Cinch 34T Steel
Seatpost: Race Face Aeffect R Dropper 30.9mm
Shifters: Shimano SLX
Handlebar: Rocky Mountain AM 760mm
Weight kg: 14.2
Rear shock: Fox Float DPS EVOL Performance
Travel rear mm: 140
Rear derailleur: Shimano XT
Travel front mm: 140

Geometry

L: Reach mm: 459; Stack mm: 607; Chainstay mm: 425; Wheelbase mm: 1188; Head angle deg: 66.6; Seat angle deg: 74.6
M: Reach mm: 436; Stack mm: 598; Chainstay mm: 425; Wheelbase mm: 1161; Head angle deg: 66.6; Seat angle deg: 74.6
S: Reach mm: 414; Stack mm: 588; Chainstay mm: 425; Wheelbase mm: 1135; Head angle deg: 66.6; Seat angle deg: 74.6
XL: Reach mm: 485; Stack mm: 621; Chainstay mm: 425; Wheelbase mm: 1220; Head angle deg: 66.6; Seat angle deg: 74.6
XS: Reach mm: 386; Stack mm: 579; Chainstay mm: 425; Wheelbase mm: 1103; Head angle deg: 66.6; Seat angle deg: 74.6

Launch price read from Rocky Mountain's US model-year page captured 2019-08 (inside the model year). Geometry is the Neutral position of the adjustable geometry chip. 2 factory colorways.

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