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2021 Rocky Mountain Thunderbolt Alloy 10

Launched at $2,199Lists today at $2,299 (2026-09)

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What a used one is worth

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New

$1,229

$794 to $1,480

Like new

$1,167

$754 to $1,406

Excellent

$1,106

$714 to $1,332

Good

$922

$595 to $1,110

Fair

$676

$436 to $814

For parts

$369

$238 to $444

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: 2021
Category: Mountain · trail
Frame material: aluminum
Sizes: XS, S, M, L, XL
Wheel size: 27.5
Launch MSRP (US): $2,199
Current list price: $2,299 (as of 2026-09)

Drivetrain

Speeds: 11
Groupset: Shimano Deore
Electronic: false

Build

Fork: RockShox Recon Silver RL 150mm | 37mm Offset
Stem: Rocky Mountain 31.8 AM | 5° Rise | All Sizes = 40mm
Tires: F: WTB Trail Boss Comp 27.5 x 2.4 // R: WTB Trail Boss Comp 27.5 x 2.4
Brakes: Tektro HD-M285 | Shimano Pad Compatible | 180mm F Rotor | 180mm R Rotor
Saddle: WTB Volt | Steel Rails | 142mm Width
Wheels: WTB ST i30 TCS 2.0 Tubeless | Tubeless Compatible | 32H rims; hubs: Shimano MT410 | 15mm Boost / Shimano MT400 Boost 148mm | RMB Axle | 163mm x 12mm x 1.5mm
Cassette: Shimano Deore 11-51T 11spd
Crankset: Rocky Mountain Microdrive 2 PC | 32T | 24mm Spindle | 170mm Crank Length
Seatpost: Rocky Mountain Toonie Drop Composite 30.9mm | XS - SM = 125mm | MD - LG = 150mm | XL = 170mm
Shifters: Shimano Deore 11spd
Handlebar: Rocky Mountain AM | 780mm Width | 25mm Rise | 9° Backsweep | 5° Upsweep | 31.8mm Clamp
Weight kg: 15.1
Rear shock: RockShox Deluxe Select+ | Sealed Bearing Eyelet | 25x8mm F Hardware | 210x55mm | Size-Specific tune in FAQ
Travel rear mm: 140
Rear derailleur: Shimano Deore 11spd
Travel front mm: 150

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 2020-09 (inside the model year). list_price_usd is the later price Rocky Mountain's archive page shows today. Geometry is the Neutral position of the adjustable geometry chip. 2 factory colorways.

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