MountainPartial spec

2018 Rocky Mountain Thunderbolt Carbon 50

Lists today at $4,499 (2026-09)

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What a used one is worth

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New

$1,958

$1,184 to $2,436

Like new

$1,860

$1,124 to $2,315

Excellent

$1,762

$1,065 to $2,193

Good

$1,468

$888 to $1,827

Fair

$1,077

$651 to $1,340

For parts

$587

$355 to $731

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: carbon
Sizes: XS, S, M, L, XL
Wheel size: 27.5
Current list price: $4,499 (as of 2026-09)

Drivetrain

Speeds: 12
Groupset: SRAM GX Eagle
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 TL
Saddle: WTB Volt Race
Wheels: Sun Helix TR25 SL Tubeless Ready - Tape | Valves Incl rims; hubs: Rocky Mountain Sealed Boost 15mm / DT Swiss 370 Boost 148mm
Cassette: Sram XG-1275 10-50T
Crankset: Sram Stylo 6k Eagle 34T
Seatpost: Fox Transfer Performance Elite 30.9mm
Shifters: Sram GX Eagle
Handlebar: Rocky Mountain AM 760mm
Weight kg: 12.26
Rear shock: Fox Float DPS EVOL Performance
Travel rear mm: 130
Rear derailleur: Sram GX Eagle
Travel front mm: 130

Geometry

L: Reach mm: 463; Stack mm: 604; Chainstay mm: 425; Wheelbase mm: 1184; Head angle deg: 67; Seat angle deg: 75
M: Reach mm: 441; Stack mm: 594; Chainstay mm: 425; Wheelbase mm: 1157; Head angle deg: 67; Seat angle deg: 75
S: Reach mm: 418; Stack mm: 585; Chainstay mm: 425; Wheelbase mm: 1131; Head angle deg: 67; Seat angle deg: 75
XL: Reach mm: 490; Stack mm: 617; Chainstay mm: 425; Wheelbase mm: 1216; Head angle deg: 67; Seat angle deg: 75
XS: Reach mm: 391; Stack mm: 576; Chainstay mm: 425; Wheelbase mm: 1099; Head angle deg: 67; Seat angle deg: 75

list_price_usd is the price Rocky Mountain's archive page shows today; no in-season capture confirmed it as the launch price. Geometry is the Neutral position of the adjustable geometry chip. 2 factory colorways.

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