Mini Bike Fest Berlin #3: Old Frames, New Concepts, and Cargo Potential
Part 3 and the final act of my favorite bikes from Mini Bike Fest 2026! You can catch the first two parts here: [Mini Bike Fest 2026]. In this final installment, we’re looking at two wild frame modifications and on the other end of the spectrum, two production-ready builds with cargo capability. Let’s get into it.
Sami’s Custom Brompton
Detailed Parts List
Frameset
Custom 1994 Brompton
Groupset Shimano Deore
Crankset
Shimano Cues
Seatpost and Saddle
Bomptom post, Fizik Aliante
Stem and Handlebar
Bomptom stem, Level 9 bar
Wheels
Original Brompton G-Line rims laced to front Son dynamo hub, Novatech rear hub
Sammy’s custom Brompton is, yes, a rebuild with modifications but also a rolling piece of cycling history. This early 1994 Brompton was damaged in a car accident and later converted into a compact gravel machine by Sami, inspired by other Brompton mods, way before the G-Line was ever a thing. Almost every part except the main frame was rebuilt, upgraded, or reimagined, including the fork, front end, rear triangle, and stem. Even the stem carries a layered past, having once belonged to a rare recumbent Brompton and then modified again to fit a “normal” Brompton. Built with a SON dynamo system, practical touring parts, and even phone-charging capabilities, this bike is full of nostalgia with a modern twist. Made for short adventures, independence, and the flex of riding something truly unique.
Benny’s Reworked Omnium Longtail prototype
Detailed Parts List
Frameset
Custom Reworked Omnium Longtail prototype
Groupset Shimano SLX
Crankset
Omnium OEM with 56T chainring
Seatpost and Saddle
Satori Dropper post and “random” gel saddle
Stem and Handlebar
3d stem and Ergotech 5 mustache bars
Wheels
Omnium OEM
Benny spotted an opportunity a few years ago to acquire the Longtail Omnium prototype, later transforming it into a 20-inch commuter with more bottle mounts than you could possibly ask for. From longtail to mini, it seems all it takes is a fully custom rear end, while the front end, fork, and wheelset can remain exactly the same.
That setup also limits Benny to 54 mm of tire clearance, but as you can see, off-road capability is not exactly the priority here. With a massive 56-tooth chainring and slim-looking 38 mm tires, this build is clearly made for speed and utility rather than rough terrain. A few details stand out as well, including the fully self-designed dropouts, droper-post cable routing, and the fact that the frame is now belt-drive ready.
Philipp’s Stainless Rheintritt Prototype
Frameset
Stainless Rheintritt Prototype
Drivetrain Shimano GRX
Crank
Chimano Cues with Alugear 48t chainring
Seatpost and Saddle
“Random” post with Brooks B17
Stem and Handlebar
Contec stem with Cinelli bars
Wheels
Fully custom set with 2.4” tires
Philipp’s Rheintritt prototype is a compact minivelo built around serious cargo versatility. Its platform can be moved from the front to the rear with only a few bolts, and the design even suggests the possibility of using both positions. The prototype was made in stainless steel in Düsseldorf, while a future production model is envisioned in steel to keep costs lower and the bike more accessible. An interesting detail is that both the platform and fork come from another mini-cargo, Le Petit Porteur. The bike also uses an eccentric bottom bracket, giving it future-proof potential for singlespeed or geared hub setups.
Bonus: Ten:07 Unicorn Pony
The Unicorn Poney by Ten:07 is already in production and offers a compact mini-cargo option with a 20-inch front wheel and 24-inch rear wheel. Coming in at just under 1,000 euros for the frame set, it sits in an interesting middle ground between the Omnium Nano, Mini Max and maybe a Monopole.
Its design may not look as streamlined as some other bikes (from my very subjective point of view) in the same category, but it still stands out as a potentially interesting option for riders who want something practical and compact.
💾: Leica SL
📍: Berlin
