Modern Classic.

This is a very different OPEN, yet it answers the same question: “What do we want to ride?”

Photography: @marcgaschphotography

We love cutting edge engineering but we also love the classic bike aesthetic. The MIN.D. combines both.

The joy of riding starts even before the first pedal stroke, as its lightness, sleek appearance and midnight blue sheen with subtle color accents put a smile on your face.

On the bike, you experience a rare mix of performance and comfort. Every gram has a function. Beyond it is nothing, except endless roads unknown.

The MIN.D. (MINimal Design); it exists because it’s the road bike we want to ride.

What's on our MIN.D.?

1	A high performance road bike frame using OPEN’s ultra-efficient tube shaping for power transfer, low weight & high strength.

2	Continuous seattube design for extreme comfort without gimmicks.

3	Tire clearance for modern road tires up to 33mm (tire labelling is unreliable. Always verify actual clearance).

4	Available in dedicated 2x and 1x versions for a super-clean look and 100% functionality.

5	Classic, understated aesthetic - in both shaping and color - ensure the frame stands the test of time.

Comfort.

Comfort is not about gimmicks, elastomers, electronic suspension or sub-atomic vibration damping graphene-infused nano-particles. It’s about finding ways to ride further, for longer, while enjoying it.

Proper fit is paramount for comfort. Our geometry is sportive (we still want to go fast) but with a realistic saddle-to-handlebar drop and reach.

Bad roads are comfort killers through cracks, potholes and vibrations. Space for 30-33mm road tires is the most effective comfort boost while also improving rolling resistance and grip.

Finally, we create comfort through the frame shape and layup. Through endless testing, we tuned our ultra-thin continuous seattube/seatmast and seatstays for maximum compliance.

Continuous Seattube.

The extremely slender 25mm* continuous seattube adds astonishing comfort to the frame.

* 30mm is normally the minimum if you want to fit in the thinnest available (27.2mm) seatpost.

Continuous fibers from bottom bracket to saddle in a very thin tube allow for more compliance at the saddle and superior vibration dampening.

The continuous seattube means you do not have an area where a seatpost is inserted into the seattube and clamped. Such an area of overlapping tubes would effectively double the material and kill the compliance.

For those worried about travel with a seatmast, don't be. The Scion Aerocomfort 3.0 is our all-time favorite bag, it fits the MIN.D. up to 80cm saddle height with saddle installed (85cm with saddle removed. You don't even have to turn or remove the bars and it fits all your gear!

Our carbon layup.

So many marketing claims about carb on. But the truth is quite simple.

Every bike company has access to the same carbon (volume is too small for custom or exclusive). So all these different names for proprietary carbon are just that, names.

What matters is that high-modulus carbon is more brittle than low-modulus. So in areas where strength is important, high-modulus is the wrong choice.

The best lay-up is a blend. We strategically place the ultra-high modulus (very stiff) carbon where we can, and tougher grades of carbon where we must. That’s how our frames are both light and durable.

R–Turn.

OPEN was the first to truly optimize a fork for flatmount brakes with its Smartmount connection.

Standard, the bike industry uses four bolts plus an adaptor to attach the brake caliper to the fork. This allows for flipping between 140mm and 160mm rotors.

However, SRAM and Shimano both always recommend 160mm for the front, so we remove the adaptor and two bolts to attach the caliper directly onto the fork for that rotor size.

This makes the setup lighter, stiffer, safer. (Check our Specifications for the correct bolt lengths for each setup.)

This design also cleans up the R-Turn fork legs and allows us to make a very light structure with very tunable stiffness and strength.

Simplicity.

This is the essence of the MIN.D. As Dieter Rams said: “As little design as possible.”*

* We highly recommend the documentary↗ and the book↗.

This is a pure road bike, and nothing more. Simply because it doesn’t have to be anything else. (and yet many take it on fast gravel and love it, Gerard included).

Design is in the details.

Wire-Stays

Vertically thin chainstays and seatstays provide compliance, while their lateral width and layup ensure rock-solid propulsion. Truly the best of both worlds.

Ritchey Rail Clamp

Clean, simple, hassle-free, that’s why the Ritchey system is so popular. The MIN.D. comes standard with the side plates for round 7mm and 7x9.6mm oval rails.

Internal Routing

The MIN.D., internal routing is designed for electronic groupsets from SRAM, Shimano and Campagnolo. Shimano mechanical groups with cable stop on the front derailleur and all 1x groups.

Thruthread Dropouts

Lock bolt secures the hanger in the frame using the same threads that secure the thru axle on the other side. Simpler, lighter & optimized for the stiffest thru-axle: Syntace X-12.

Smart-Mount 160

The brake caliper attaches directly onto the frame, positioned for 160mm discs. Just like they do on the R-Turn. No adaptors or spacers and extra hardware required. Lighter, stiffer, safer.

Reviews & Awards

“Open MIN.D Is a Road Bike Like Few Others. Why I fell for this radically conventional road bike: Radially conventional light and stiff frame, Long-ride geometry ideal for going up and down big-mountain passes, Throwback round tubes give it a pleasing ride on rougher roads”

– Bicycling

“MIN.D. California: A purist’s absolute dream bike, stiff, light with superb handling and classic, minimalist looks. But you’re gonna have to pay.”

– Cyclist

“The MIN.D. is focussed on what's important: having fun riding! As a modern road bike all-rounder, the MIN.D isn't above hunting down KOMs or an outing on the next forest track. The agile and playful handling in combination with its sprinting abilities make it a fun machine on winding roads. The continuous seat tube, which removes the need for a traditional seatpost and clamp, has a lot of compliance, and together with the 700 x 32C wide Schwalbe Pro One tires and a moderately stretched riding position, contributes to a very balanced level of comfort.”

– Design & Innovation Award

“The OPEN MIN.D. is a harmonious road bike concept that sensibly combines classic and minimalist aesthetics with modern technology. The bike isn’t as revolutionary as the UP, but it strikes a perfect balanced between sportiness and comfort, whether on asphalt or the occasional gravel road short-cut. If you appreciate extravagant yet understated design, prefer agile handling and don’t want to commit yourself to a single type of terrain or distance, the frame set of the OPEN MIN.D. will make a good basis for your dream bike.”

– Granfondo

“Besides spot-on handling, most impressive was how designer Gerard Vroomen was able to suffuse such modern-day performance and technology into a veritable less-is-more, package. Between the 25mm integrated seat tube, room for 32mm ties, small diameter tubes and subtle, multi-colored flare inside the forks and seatstays, the Open checked all the boxes.”

– RoadBikeAction Editor’s Choice - Best Road Bike

“Its combination of characteristics made the bike a delight to ride around the narrow, technical lanes I’m lucky to live amongst. The Min.D was light enough to make their 20% gradients manageable and stable enough to pilot down twisting, narrow descents with confidence. Plus the often broken road surface was no match for the bike’s big tyres. In short the Min.D has opened up new avenues and in so doing made riding a road bike a pleasure for me once again.”

– Cyclist Best of the Best - Endurance bikes

“Brilliant frameset for fast climbing, and it's comfortable too. Overall, the Open MIN.D is absolutely fantastic. It balances stiffness with comfort that can really be felt on rough roads. The handling is razor sharp, making this a fun bike to ride both uphill and back down.”

– Road.cc

Frame Specifications.

Stock Colors

Midnight Blue

With 4-color fade

Paint ready

Ready-To-Paint for custom painting

Weight Frame-only Size L, w/o metal parts ±3%

870g

RAW, incl. full mast

Weight Fork-only ±3%

335g

Uncut Steerer

Sizes

S/M/L/XL

For CM/Inch Sizes See Geometry down below

RTP (Ready-To-Paint)

A clearcoat is not needed for UV protection but recommended to protect against scratches and wear. Some customers leave the frame bare.

BB standard

BB386EVO pressfit 86.5x46mm BB shell

Recommended groupsets

Any Shimano, SRAM & Campagnolo 1x

Any SRAM eTap

For Shimano 2x mechanical, please contact us

For Shimano Di2, the minimum achievable saddle height (due to the Di2 battery fit inside the seatmast) is listed in the geometry table below

Please note the seatmast inside diameter reduces above the toptube, so you need enough seatmast length to fit the Di2 battery. Check in the frame before cutting the seatmast.

Front thru-axle

100x12mm superlight Carbon-Ti X-12

Front disc rotor size

160mm only

Front brake caliper mount

Smartmount 160 system attaches flatmount caliper, without adaptor, for 160mm rotors

Rear thru-axle

142x12mm superlight Carbon-Ti X-12

Rear disc rotor size

160mm only

Rear brake caliper mount

Smartmount 160 system attaches flatmount caliper, without adaptor, for 160mm rotors

MultiStop internal system

Di2, eTap, EPS, 1x mechanical (all groups)

Headset

Cane Creek Integrated IS42/28.6 OPEN-custom Integrated IS47/38

Complete set Part# CAA2011K. To purchase, go here.

Seatpost

Integrated mast 25mm BB to saddle

To travel with the integrated mast, we recommend the Scicon Aerocomfort 3.0

Seattube top clamp

OPEN-custom saddle top clamp with micro-wedge for 25mm seat mast with 15mm adjustment

MOCT top clamp with 15 – 35mm adjustment available separately.

Rail clamp

Ritchey rail clamp with side plates for round 7x7 and oval 7x9.6mm rails included

Travel Bag Recommendation

Scicon AeroComfort Road 3.0.

Scicon has an easy WILL YOUR BIKE FIT tool. Use your current bike setup for dimensions A, B & D and use the wheelbase in our geometry chart below for dimension C.

Indoor trainer compatibility

Detailed information here↗

Installation information

Brake hose installation↗

Assembly Guideline↗

Seatmast cutting & installation instructions↗

Seatmast installation video↗

Max. weight (total rider+luggage)

120kg / 264 lbs

EN/ISO/internal test standard

Warranty

Detailed information here↗

Included with frameset

Headset

Seattube Top Clamp

Rail Clamp, Thru-Axles

2 RD Hangers

2 MultiStops (Di2, eTap)

Cable Exit Stop

Noise-Reduction Foam Sleeves

Bottle Cage Bolts

Manual

MIN.D.

Get your MIN.D. →

Figures.

MIN.D Geometry PDF 🗎

Estimates; for accuracy use stack/reach of your current gravel/road bike or a fit session.
Maximum when using 5mm spacer, giving 10mm safety margin on top (30mm margin with MOCT seattube top clamp). Assuming 40mm rail-to saddle deck (40–45mm is standard for most saddles).
Maximum when using 5mm spacer, giving 10mm safety margin on top (30mm margin with MOCT seattube top clamp). Assuming 40mm rail-to saddle deck (40–45mm is standard for most saddles).
Maximum when using 5mm spacer, giving 10mm safety margin on top (30mm margin with MOCT seattube top clamp). Assuming 40mm rail-to saddle deck (40–45mm is standard for most saddles).
Estimates; for accuracy use stack/reach of your current gravel/road bike or a fit session.
Estimates; for accuracy use stack/reach of your current gravel/road bike or a fit session.

PDF 🗎	S	M	L	XL
Rider Height ¹	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191
BB-To-Saddle Rail Max. ²	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780
BB-To-Saddle Rail Max. ³	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780
BB-To-Saddle Rail Max. ⁴	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780	700 , 740 , 780
Rider Height ⁵	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191
Rider Height ⁶	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191	160-171 , 169-180 , 178-191
Stack	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610
Stack	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610
Stack	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610
Stack	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610	535 , 560 , 585 , 610