PURPLE HAZE FRAMESET

From: 1.199,00 

Standard Color: Clean White

Additional M5 Bosses, Braze Ons, etc.

ADD A FORK

Choose the right fork for the job.
Carbon forks always come black matte, Steel forks come color matching with the frame.

Add a Headset

Add a Headset from White Industries or Acros to your order.

What we need to know:
  • Custom color name -> List of custom colors
  • Custom color finish (glossy or matte)
  • Decal color (black, silver, black with silver outline) – only for frames
  • PLEASE NOTE: black decals may not be visible when combined with dark colors

Available to order

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Description

Terrain‑focused foundation, open by intent

The Purple Haze frameset is the most distilled expression of the bike’s off‑road intent. It exists for riders who want the stability, geometry and character of the Purple Haze without committing to a predefined setup. This is not a reduced version of the complete builds—it is the same foundation, deliberately left open.

At its core, the frameset carries the same geometry, tubing selection and construction as every complete Purple Haze. Nothing is simplified, nothing omitted. The ride feel remains stable and confidence‑inspiring, prioritising control on loose terrain and consistency across long off‑road efforts. From the first ride, the frame feels calm rather than reactive, encouraging commitment without demanding constant correction.

The Purple Haze is built around the assumption that routes will deteriorate, surfaces will vary and rides will extend beyond neat definitions. The frameset retains this attitude fully. It feels at home once pavement is no longer reliable, offering predictable handling and a balanced riding position that supports long hours over mixed terrain.

What the frameset removes is prescription. Drivetrain choice, wheel selection and equipment level are left intentionally undefined, allowing the rider to decide how far to lean into purity, performance or everyday capability.

Designed for off‑road balance, not categorisation

The Purple Haze geometry emphasises stability and traction rather than sharp, nervous responses. Load is carried confidently, steering remains composed and the bike stays predictable when surfaces loosen or lines become less obvious. These characteristics remain consistent across different build directions.

This makes the frameset especially suitable for riders who want flexibility without losing identity. Whether built light and minimal, mechanically simple or fully equipped for extended use, the core ride feel remains recognisably Purple Haze.

Compliance and stiffness are balanced to support sustained off‑road riding. The frame absorbs surface irregularities without muting feedback, keeping the rider connected to terrain while reducing fatigue over longer distances.

Freedom built on a clear foundation

Choosing the frameset means choosing direction consciously. Mechanical or electronic drivetrain, 1× or 2×, clean or fully practical—the frame supports these decisions without forcing compromise. Mounting options and clearances are designed to accommodate varied use cases without shifting the bike’s off‑road focus.

Unlike frames that feel undecided without components, the Purple Haze frameset feels complete on its own. It offers structure without instruction, giving riders room to express how they ride rather than inheriting a preset answer.

This openness also supports long‑term ownership. Components change, riding habits evolve, and the frameset remains relevant without needing reinterpretation.

Finished with the same attention as complete builds

Every Purple Haze frameset is finished individually. Frame size, colour and selected mounting options are defined during ordering before the frame is assembled and prepared in our workshop. The frameset receives the same care and attention as a complete bike.

This ensures that the starting point already feels resolved. What follows is not completion of an absence, but refinement of an idea.

For riders who prefer to decide

The Purple Haze frameset exists for riders who don’t want their off‑road bike explained to them. It assumes intent rather than questioning it. The frame provides stability, control and consistency; the rest is left deliberately open.

It is not the fastest route to a finished bike.
It is the clearest one.

A terrain‑focused off‑road frameset.
Defined by stability, control and deliberate openness.
Curated for riders who want the Purple Haze ride feel first—and the freedom to shape everything else around it.

Image of the Purple Haze bike frame with numbers and lines for the geometry table
Geometry
Geometry XS S M L XL XXL
ST Length (mm) 430 480 510 540 570 590
TT Length (mm) 525 535 552 568 583 602
Reach (mm) 375 380 385 390 393,8 397
Stack (mm) 566,3 574,6 583,9 602,1 628,5 647,5
HT Angle (°) 70,5 70,5 70,5 71,5 71,5 71,5
HT Length (mm) 120 135 145 160 190 210
ST Angle (°) 75 74,5 74 73,5 73 72,5
CS Length (mm) 440 440 440 440 440 440
BB Drop (mm) 72 72 72 72 70 70
Wheelbase (mm) 1036 1044 1048 1052 1059 1072
Fork Length (mm) 403 403 403 403 403 403
Fork Offset (mm) 45 45 45 45 45 45
Max Seatpost Insertion (mm)* 241 271 271 301 331 351
Wheel Size 700c 700C 700C 700C 700C 700C

* Max seatpost insertion +5 mm / min. seatpost insertion 120 mm

All Sour Bicycles frames are made by hand, one-by-one, in our own facility in Saxony, just outside of Dresden. We use custom tubing designed and drawn for our frames, it’s a multi-butted heat-treated CrMo steel that’s ready to stand the test of time. All our steel is produced from a partially recycled product in Germany and drawn by one of the worlds leading production facilities in Taiwan, the beating heart of the worlds bicycle production.

Our dropouts are designed in-house in Dresden and have a replaceable derailleur hanger.

The seat clamp is designed in-house and is integrated into the frame. Should it ever fail, the frame can be professionally modified to use a traditional clamp, if repair of the original clamp is not possible. We have never seen one fail.

By The Numbers

Headtube: 44 mm upper and lower
Bottom bracket: 68mm T47 threaded bottom bracket
Axle: 12mm x 142mm thru axle
Seat post: 27.2mm
Brake standard: FM160 Direct. More info here.
Wheel size: Size XS/S 650B ooptimized (bb height), M – XXL fit 700C/29“
Tire clearance: up to 55mm
Tubing: Custom drawn, multiple butted, partly heat treated SOUR CrMo (we love steel)
UDH/Transmission Compatible

Bonus facts and features:

Color: Clean White
Fender and rack mounts
Recommended tire size 45mm – 55mm
Two water bottle mounts inside frame, a third bottle mount under downtube
external cable routing on the downtube for mechanical drivetrains
internal brake hose routing
27,2mm seatpost diameter for maximum comfort

Business Fork

The Business Fork is our carbon gravel and adventure fork designed for all the adventures, big and small!

We designed this fork in-house and worked with our long-term production partner in Taiwan to make it. We have tested this fork at EFBE in Germany and pass their Tri-Test with flying colors!

Specs

Maximum Tire Width: 55mm
Axle to Crown Length: 403mm
45mm Rake
Tapered Steerer Tube 1½” – 1⅛”
Thru-axle 12mm x 100mm

3 Cargo Cage Eyelets on Fork Legs
Internal Dynamo Cable Routing
Flat-mount Brake Mount 160mm
Fender Mounting Possible
Weight With Full Steerer and Axle: ±565g

Brake Mount Thickness: 35mm

Below are the frame weights for each size of the Sour Purple Haze. These weights do not include powdercoating, but please keep in mind that your chosen powdercoat may be heavier than the average coating we use. Fades, gradients, and metallic colours can weigh more than single solid colour powdercoat. If you are interested the final weight, please get in touch. Weights are averaged over three frames per size. We apply a wax coating on the inside of the frame for rust prevention, this will also add a small amount of weight.

Purple Haze Frame Medium = 2195g ±50g
Small Parts: Bolts, rear axle, brake mount, derailleur hanger= 160g

Included with your frame

Included with your Purple Haze frame or frameset is all the grommets and small parts to run any cabling you wish and a derailleur hanger. You get a rear thru-axle of course, and if you’re ordering a frameset, you get a front axle with your fork as well. Headsets are only included if you add one to your order.