**If you would like order a build kit, please add your frameset and the build kit to your cart, check out, and we'll handle the rest!**

The Neutrino Mini Velo is your perfect companion for urban adventures, multi-modal commutes, and travel escapades. Whether you’re a frequent flyer, apartment dweller, or simply looking for a fun and versatile N+1 bike, the Neutrino is designed to fit seamlessly into your life—and your heart.

Compact, Convenient, and City-Ready

For city dwellers and apartment enthusiasts, the Neutrino’s compact size makes navigating tight spaces a breeze. Its small wheels deliver quick acceleration, perfect for darting through traffic or winning stoplight sprints. Once you’ve reached your destination, carrying the bike upstairs or fitting it into your apartment is effortless thanks to its reduced length. Plus, you won’t have to worry about leaving it outside overnight—it’s easy to keep your Neutrino safe and cozy indoors.

Multi-Modal Marvel

If your commute involves trains, buses, or other modes of transport, the Neutrino shines. Its small footprint allows it to slip into train cars without taking up valuable space (or earning side-eye from fellow passengers). Planning a Rinko adventure? The Neutrino simplifies the process—no need to cut fenders or fully disassemble your bike. Just loosen the stem, turn the handlebars, and pack it neatly into a Rinko bag.

Built for Travel

The Neutrino is as at home in a suitcase as it is on the streets. For cyclists who frequently travel by plane, car, or bus to reach their starting point, the Neutrino’s compact frame saves you from oversized baggage fees and logistical headaches. Disassemble it into its original shipping box, and you’re good to go.

Designed With Purpose

Not only is this bike a hoot to ride, we gave it the Velo Orange treatment just like any other of our frame offeings: thoughtful design considerations, beautiful construction, and surprising capability. The Neutrino is meant to challenge assumptions—yes, those tiny wheels can be fast, stable, and practical.

Its geometry is scaled to preserve the feel of a full-sized bike, so you can ride it just like any other urban or touring rig. The small wheel size brings benefits in agility, storage, and transport, all without sacrificing comfort or versatility.

A Guaranteed Good Time

Above all, the Neutrino is just plain fun to ride. Its nimble handling, smooth ride quality, and unique character will bring a smile to your face every time you hop on. Whether it’s your daily ride or your weekend adventure bike, the Neutrino is a joy to own and ride.

Here are the specs:

Frameset material: 4130 double butted chromoly frame and fork
Fork: 1 1/8" threadless with accommodations for fenders, Flat Pack Rack, Randonneur Rack, and even a Mojave Cage or a bikepacking-style cage
Wheel Size: 20", 406 Bead Seat Diameter. That's BMX, so high-quality rims and tires are cheap, plentiful, and strong.
Tire Clearance: Clearance for 2.3" tires WITH fenders. Holy cow!
Rear Spacing: Sliding, 135mm QR dropouts for geared, single speed, or internally geared hubs
Fork Spacing: 100mm QR
BB: English threaded 68mm
Brakes: Disc Post mount rear, IS Front, 160mm rotors suggested
Seatpost: 31.6mm (35.0mm seat collar not included). Compatible with internal dropper posts.
Front Derailleur Size: 35.0mm (1x crankset recommended, though)
Water bottle mounts: Seattube, downtube, and under-downtube bottle cage mounts
Fender bosses: seat stay bridge, chainstay bridge, under fork crown
Frame Eyelets: Eyelets on rear dropouts for racks and fenders. Internal eyelets on monostay
Fork Eyelets: Eyelets on fork dropouts. Triple thru-bosses on the blades for cargo/water bottle cages. Hourglass braze-on for Rando Rack.
Cable Routing: External on the downtube and internal dropper routing on the seat tube.
Paint: Celery Green with Velo Orange decal and metal headbadge
Click for FAQs and Travel Tips

We carefully tweaked the geometry to obtain a completely normal riding bike without any drama. Since the sizing is a bit less-than-traditional, we generally suggest folks that are 5'6" (168cm) and under go with a Small, and folks between 5'6" and 6' (183cm) go with a Large. If you're 6'1" to 6'4" (193cm), go with a XX-Large.

Please note: the XXL size is slightly too big to be packed within 62 linear inches. Check with your airline to see if that matters. I've found most airlines have done away with length requirements and focus on overweight at around 50 lbs.

If you are getting a VO Headset along with your frame, you can get it installed for a reasonable fee. Simply click here to navigate to the installation charge page, and add the fee to your order before checkout.

For Neutrino build tips, tricks, and FAQs, check out this article.

Frames

Piolet Frameset

Low Kicker

Neutrino Frameset

Polyvalent - Diamond

Pass Hunter

Rando Frameset

Chessie Frameset

Build Kit for Neutrino

Velo Orange derailleur hangers