Thunder
Thunder: A loud crashing heard after lightning, caused by the expansion of rapidly heated air.
The trail get's no — "heads up!" By the time you hear it, the strike has already occurred. When you're blasting down a new stretch of single track, the sound is deafening. The only noise exists in the moment — your bike, the environment, and you. If you're tired of hearing a bunch of static nonsense, and need to turn the volume down before you crack, then listen up.
- Trail geometry in 4130 butted chromoly steel
- Three pack mounts on top of down tube and seatstays. Bottle mount on seat tube and bottom of down tube. Bento box mount on to tube. Rear rack mount.
- Marzocchi Bomber Z2 fork with 130mm of travel
- Shimano Deore, 12 speed drivetrain w/ 10-51T Deore cassette
- TRP Slate EVO hydraulic disc brakes
- KS Rage I dropper seatpost
- WTB tubeless ready tires and rims
Purpose-built for singletrack and mountain touring, Thunder is ready to flow technical terrain while maintaining all-day ride capability.
Breezer Bikes ship partially assembled from the factory. We always recommend that a trained mechanic build your bike, but if you follow the assembly video and take your time, you can build the bike yourself.
Watch Assembly Video
Equipment: Thunder
Specifications
FRAME & FORK
Frame: Breezer 4130 Butted Chromoly Steel, tapered head tube 1 1/8” to 1 1/2”, 148mm rear spacing, UDH compatible, three pack mount on top of down tube and seatstays, waterbottle mount on seat tube and bottom of down tube, bento box mount on to tube, rear rack mount, post mount disc brake
Fork: Marzocchi Bomber Z2, Rail damper, rebound adjustment, 130mm travel, 44mm offset, 15x110 Kabolt axle
DRIVETRAIN
Crankset: Shimano Deore, small 170mm, M, L, XL 175mm
BB: Shimano Deore
Rear Derailleur: Shimano Deore Shadow Plus, 12 speed
Right Shifter: Shimano Deore Rapid Fire Plus, 12 speed
Cassette: Shimano Deore 10-51T
Chain: KMC x12 EPT Anti Rust
WHEELSET
Rims: WTB ST i30 TCS 2.0, 32H, tubeless ready
Spokes: Pillar, 14 gauge, butted
Front Hub: KTi, sealed cartridge bearing, Center Lock
Rear Hub: KTi, sealed cartridge bearing, Center Lock, Microspline
Front Tire: WTB Vigilante, 29 x 2.5, TCS Light/ Fast Rolling 60tpi Dual DNA
Rear Tire: WTB Trail Boss, 29 x 2.4 Comp/Fast Rolling 27tpi
BRAKES
Brakes: TRP Slate EVO
Brake Levers: TRP Slate EVO
Front Rotor: TRP Center Lock, 180mm
Rear Rotor: TRP Center Lock, 180mm
COCKPIT & CONTACT POINTS
Handlebar: Alloy, 780mm width, 20mm Rise, 8° backsweep, 4° upsweep, 35mm OD
Grip: WTB Burr, single sided lock on
Stem: 6061 aluminum, 45mm reach, 35mm clamp
Headset: FSA ORBIT
Saddle: WTB Solano medium, chromoly rail
Seatpost: KS Rage I dropper, small 100mm, M & L 125mm, XL 150mm. Westy 2.0 remote
Seatpost Clamp: Alloy quick release, 31.8mm
FIT & DETAILS
Color: Heavy Skies (Matte Pewter)
Weight: 34.2 lbs (Size Large)
Geometry
S (15")
Seat Tube (C–T): 370
Effective Top Tube: 593.5
Head Tube Length: 100
Seat Tube Angle: 75°
Head Tube Angle: 67.5°
Chainstay: 450
Wheelbase: 1150.2
BB Drop: 72
Fork Offset: 44
Stack: 647.4
Reach: 420
Standover: 750
Wheel Size: 29”
Seat Post Diameter mm: 30.9
Rider Min Height: 5'3”
Rider Max Height: 5'7"
M (17")
Seat Tube (C–T): 420
Effective Top Tube: 622.1
Head Tube Length: 110
Seat Tube Angle: 74.5°
Head Tube Angle: 67.5°
Chainstay: 450
Wheelbase: 1174
BB Drop: 72
Fork Offset: 44
Stack: 656.6
Reach: 440
Standover: 783
Wheel Size: 29”
Seat Post Diameter mm: 30.9
Rider Min Height: 5'6”
Rider Max Height: 5'10"
L (19")
Seat Tube (C–T): 470
Effective Top Tube: 650.9
Head Tube Length: 120
Seat Tube Angle: 74°
Head Tube Angle: 67.5°
Chainstay: 450
Wheelbase: 1197.8
BB Drop: 72
Fork Offset: 44
Stack: 665.8
Reach: 460
Standover: 817
Wheel Size: 29”
Seat Post Diameter mm: 30.9
Rider Min Height: 5'9”
Rider Max Height: 6'0"
XL (20.5")
Seat Tube (C–T): 521
Effective Top Tube: 678.6
Head Tube Length: 130
Seat Tube Angle: 74°
Head Tube Angle: 67.5°
Chainstay: 450
Wheelbase: 1226.6
BB Drop: 72
Fork Offset: 44
Stack: 675.1
Reach: 485
Standover: 850
Wheel Size: 29”
Seat Post Diameter mm: 30.9
Rider Min Height: 5'11”
Rider Max Height: 6'2"
Thunder is a Speaker Blaring
The boom that tells you something already flashed.
Once you drop into the trail, you’re committed. No negotiation. No second-guessing. You react, adjust, and keep moving.
Count the Seconds
Framework that stays calculated when danger closes in.
A butted chromoly steel frame stays connected as pressure builds. Your tools stay close through mounts across the frame, top tube, and seat stays, with fender mounts ready for what’s looming. Thunder rides for miles before you hear it.
Absorb the Shock
Quiet everything that doesn't matter.
Shock comes fast and loud. The Z2 Bomber fork absorbs it with 130mm of travel, steadying the front end and keeping the moment quiet. Fewer disruptions mean fewer adjustments — no remixing your line to avoid interference on the trail.
Supply Your Demand
Keep the network online.
A full Shimano Deore 12-speed drivetrain transmits voltage into motion without delay or outage. A Deore Shadow Plus rear derailleur paired with a wide-range Deore 10–51T cassette distributes power evenly for an ideal range of service—what you generate is what moves you forward.
Just in Time
Control that stops before consequence.
TRP Slate EVO hydraulic disc brakes with 180mm rotors transfer consistent stopping energy when you need it. Flip the power off smoothly through Slate levers, letting you choose when to pause. The KS Rage I dropper post raises or lowers your point of view, keeping you directly in the saddle.
Count the Seconds
Framework that stays calculated when danger closes in.
A butted chromoly steel frame stays connected as pressure builds. Your tools stay close through mounts across the frame, top tube, and seat stays, with fender mounts ready for what’s looming. Thunder rides for miles before you hear it.
Absorb the Shock
Quiet everything that doesn't matter.
Shock comes fast and loud. The Z2 Bomber fork absorbs it with 130mm of travel, steadying the front end and keeping the moment quiet. Fewer disruptions mean fewer adjustments — no remixing your line to avoid interference on the trail.
Supply Your Demand
Keep the network online.
A full Shimano Deore 12-speed drivetrain transmits voltage into motion without delay or outage. A Deore Shadow Plus rear derailleur paired with a wide-range Deore 10–51T cassette distributes power evenly for an ideal range of service—what you generate is what moves you forward.
Just in Time
Control that stops before consequence.
TRP Slate EVO hydraulic disc brakes with 180mm rotors transfer consistent stopping energy when you need it. Flip the power off smoothly through Slate levers, letting you choose when to pause. The KS Rage I dropper post raises or lowers your point of view, keeping you directly in the saddle.