EXPLORE SÓNDERKLASSE
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Race bike manifestation we ever wanted for mere mortal (aka non professional) that excel not only in tarmac but also cobbles and hard pack terrain
In this latest iteration, we try to put everything in the just right way from design and build quality in artisanal quality
INTENDED USE
Performance
ROAD RACE
ALL ROAD PERFORMANCE
Metal bikes—
Revolutionize
Classic shape and craftsmanship with
flagship performance
Fusion of carbon and metal
We can't compromise the performance so we push further—XCr stainless and carbon tubing. Stainless are stiffer than Alumunium even Titanium the downside are they're slightly heavier, but with the help of carbon tubing we able to fine tune the balance the weight and comfort
Even more we obtain bigger outer diameter of carbon tubing to max out the capabilities, and they're progressively follow the bike size. So, larger frame may get bigger tubing diameter
Polybox
TUBES JOINT
REINFORCEMENT
Save watts and more powers
You can observe this Polybox tubes joint implemented in the massively wide "pyramid-shaped" cluster between bottom bracket shell-down tube-seat tube, optimize power transfer with wider support to maintain lateral stiffness of your bike
It affect the bikes behave and response to your pedaling, near instant and to propel you forward. It's also more stable especially when you of saddle and "twisting" the bikes while hammering down the pedals in the drop
This specific feature are exclusive only for Sonderklasse model that only possible with metal 3D printing
SELECTIVE LASER
MACHINED
Rapid 3D modeling and more precise frame cluster
With take serious effort to design your Sonderklasse before actual fabrication process, especially ensuring the lug and cluster in the right measurement. After we lock the 3D model from out tools, we printed them it allow us to build more accurate bike geometry—even in mili meter of thickness wall level. We try to raising the bar of the output and in the hood.
All frame cluster and junction in Sonderklasse are stainless and 3D printed, except the T47 bottom bracket shell that lathe machined from seamless 316L stainless tube
Fulesage
FRAME KIT COMPONENT
Complete package and integration
Fulesage means airplane main body, so do with Sonderklasse now comes with our carbon component. Integrated carbon bar and carbon seat post is now included with your frame and fork—with your choice of size of bar width and stem length for total fit in and out
Other upgrade kit options from Deda DCR RS, Columbus Trittico, and ENVE In-route also available
Specification
Tubing
Hi-mod 3K twill carbon front triangle, Columbus XCr stainless chain and seat stays
Frame cluster
3D printed SLM, stainless steel 316-L
Fork
Full carbon T700, ISO 4210, tapered steer tube (28,6-39,8mm), flat mount disc brakes
Integrated handlebar
Full carbon T700/T800, ISO 4210 (Integrated handlebar, seatpost, and fork)
Cable routing
Internal hidden routing, FSA ACR system, electronic groupset only (Di2, AXS, EPS compatible)
Brakes
Flat mount disc brakes, ⌀140mm rear/⌀160mm front
Seat post
round ⌀27.2mm, 15mm setback, full carbon T700/T800, ISO 4210, round and oval saddle rail compatible
Front derailleur
Alumunium 3D printed, bands-on (removable), ⌀34.9mm, 5Nm max torque
Rear dropout
UDH hanger, SRAM Transmission compatible
Bottom Bracket
T47 threaded inboard bearing, 86mm shell width
Headset bearing
IS52/IS52 (⌀51.8mm bearings)
Max tyres
up to 700x40 without fenders
Wheels OLD
Front 12x100mm, Rear 12x142mm, Thru axle
Chainring size
Up to 53-36T (2x crankset), 40T (1x crankset)
Build process
silver/brass fillet brazing, resin epoxy joint
Max weight system
±100kg total, includes the carrier and the rider
Estimated weight
±1590gr, size 510mm seat tube, frame only, unpainted
Bespoke sizing
Sonderklasse it's bespoke frame specific model. If you need sizing references, you can refer size geometry from our other bikes model such as Eclair for road and Reiziger for more sportive endurance model
FREE CUSTOM GEOMETRY
SPECIAL OFFER FOR FULL BIKE BUILD
Just get ride, soon
We help to build your full bike too. From components, accessories and budget that fit your desired specs and riding needs from renowned brand.
Don't hesitate to contact us about your custom build details

Build Details
Standards in every frame without additional charge
Your size of Sonderklasse frame
1x All road carbon fork, 700x40 max, tapered internal cable routing, fender mount
1x Integrated carbon handlebar 5/25 flare options
1x carbon seatpost, ⌀27.2mm, 350mm length
Headset and bearing (FSA ACR system)
1x removable alloy front derailleur hanger ⌀34.9
1x alloy seat post collar ⌀34.9
2x M12 thru axle (front and rear)
1x UDH™️ rear derailleur hanger
Rubber grommet for internal cable routing
1 years fork warranty, Life time support, and 180 days Frame Crash Protection for 30% off frames repair and tubing replacement/rebuild (repaint excluded)
Minimal color paint included
+1000 RAL swatches option are ready to choose, gloss finish with black/white frame decals. Raw unpainted gloss finish exclusive for stainless build only
RAW gloss finish included

Go to RAL color library here ->

RAL gemeinnützige GmbH Germany
©All rights reserved
6 month lead time
Secure your build with 50% deposit for next batch schedule
OUR PRODUCTION CALENDAR ->
Sónderklasse fulesage kit
STEM/BAR COMBO
Carbon integrated handlebar,
5/24° flare options, compact drop
SEATPOST
Carbon seatpost 15mm setback,
round/oval saddle rail compatible
FORK
All road carbon fork Internal cable routing,
700x40 max, fender mount
Upgrade kit options
Deda Elementi EDG DCR
Zero100 alloy seatpost, 0 setback
Alanera RS Integrated handlebar
EDG DCR Road 700x30 fork
Columbus Trittico Road
Trittico carbon seatpost, 15-25 setback
Trittico 2 piece stem/dropbar combo
Trefoil carbon fork 700x32
ENVE In-route All road Aero
Enve twinbolt seatpost, 15 setback
Aero in route stem/bar combo
AR In route fork 700x40