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2018 Rocky Mountain Thunderbolt Alloy 50

Launched at $3,199Lists today at $3,199 (2026-09)

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What a used one is worth

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New

$1,392

$842 to $1,732

Like new

$1,322

$799 to $1,646

Excellent

$1,253

$757 to $1,559

Good

$1,044

$631 to $1,299

Fair

$766

$463 to $953

For parts

$418

$252 to $520

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: 2018
Category: Mountain · trail
Frame material: aluminum
Sizes: XS, S, M, L, XL
Wheel size: 27.5
Launch MSRP (US): $3,199
Current list price: $3,199 (as of 2026-09)

Drivetrain

Speeds: 11
Groupset: SRAM GX
Electronic: false

Build

Fork: Fox 34 Float Performance 130mm
Stem: Rocky Mountain AM
Tires: Maxxis Minion DHR II Folding 27.5 x 2.3 / Maxxis Crossmark II 27.5 x 2.25
Brakes: Sram Level T 180 mm
Saddle: WTB Volt Race
Wheels: Sun Helix TR25 SL - Tubeless Compatible - Tape | Valves | Sealant Not Incl rims; hubs: Rocky Mountain Sealed Boost 15mm / Sram MTH 746 142mm
Cassette: Sram PG-1130 11-42T
Crankset: Race Face Aeffect Cinch 32T Steel
Seatpost: Race Face Aeffect Dropper 30.9mm
Shifters: Sram GX
Handlebar: Rocky Mountain AM 760mm
Rear shock: Fox Float DPS EVOL Performance
Travel rear mm: 120
Rear derailleur: Sram GX
Travel front mm: 130

Geometry

L: Reach mm: 446; Stack mm: 595; Chainstay mm: 421; Wheelbase mm: 1156; Head angle deg: 67.5; Seat angle deg: 74
M: Reach mm: 423; Stack mm: 585; Chainstay mm: 421; Wheelbase mm: 1130; Head angle deg: 67.5; Seat angle deg: 74
S: Reach mm: 401; Stack mm: 576; Chainstay mm: 421; Wheelbase mm: 1104; Head angle deg: 67.5; Seat angle deg: 74
XL: Reach mm: 472; Stack mm: 609; Chainstay mm: 421; Wheelbase mm: 1188; Head angle deg: 67.5; Seat angle deg: 74
XS: Reach mm: 378; Stack mm: 567; Chainstay mm: 421; Wheelbase mm: 1078; Head angle deg: 67.5; Seat angle deg: 74

Launch price read from Rocky Mountain's US model-year page captured 2017-10 (inside the model year). Geometry is the Neutral position of the adjustable geometry chip. 2 factory colorways.

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