Fast, Fun, Freedom

The U.P. started the fast gravel category by combining road bike speed with go-anywhere tires & geometry.

Photography: @marcgaschphotography
With its dropped chainstay for more tire clearance and dual wheel size compatibility, the U.P.(P.E.R.) became the de facto standard for performance gravel bikes.

What's U.P.?

1
Fitted with 700c road tires, it is a very fast road bike


2
With gravel tires (32-40mm), itโ€™s a go-anywhere bike perfect for mixed surface rides and most gravel routes
3
650b mountain bike tires make it unstoppable on very tough terrain yet much faster on pavement than youโ€™d expect thanks to the road position.

The road position lets you get out of town quickly (unlike a mountain bike). Space for big tires gives you grip on tougher terrain (unlike a road bike). 

Get one set of all-round tires or dedicated wheelsets for fast & tough terrain.

Available in 2 versions.

U.P. and U.P.P.E.R. differ only in weight (180g less for the U.P.P.E.R.) and color (many options vs just matte black)*

Both also come in RTP (Ready-To-Paint) so you can have it custom-painted.

*
There is no difference between the U.P. and U.P.P.E.R. in terms of geometry, durability, stiffness, tire clearance or capabilities.
U.P. Frameset
U.P. Frameset
GET U.P.
Starting from โ‚ฌ3,200.00
U.P.P.E.R Frameset
U.P.P.E.R Frameset
GET YOUR U.P.P.E.R.
Starting from โ‚ฌ4,500.00
OPEN U.P. EKAR
OPEN U.P. EKAR
GET YOUR U.P. EKAR
Starting from โ‚ฌ3,999.00
OPEN U.P. EKAR Sage Limited Edition
OPEN U.P. EKAR Sage Limited Edition
GET YOUR U.P. EKAR LIMITED
Starting from โ‚ฌ4,499.00

Tire Clearance.

U.P. can fly like a road bike with a 700x28c tire or play like a dropbar mountain bike with a chunky 27.5x2.1".

Fitting all these tire sizes is one thing, but the beauty of the U.P. is that it rides well in all these configurations (as customers, media and award judges confirm time and again).

So whether you ride it with road or mountain bike tires, on pavement or off-road, you always experience agile, responsive and confident handling.

Dropped Chainstay.

Probably the most copied feature of the original U.P. (we're quite proud :-) 

Chainring(s), frame and tire all fight for space just behind the bottom bracket. The dropped chainstay gets around the chainring and away from the tire, thus increasing tire clearance.
The result? Space for big (mountain bike) tires without needing wide cranks. So you can run road cranks with a low Q-factor (pedal stance) for the best pedaling efficiency

Instead we drop the right chainstay to move it out of this crowded area, allowing it to be wider and therefore stiffer (twice the width will give you eight times the stiffness!)

Our carbon layup.

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

Every bike company has access to the same carbon. Compared to industries like aviation, carbon volume for bikes is too small for custom or exclusive. So all those different names for proprietary carbon are just that, names.
What matters: high-modulus carbon is stiff but brittle, low-modulus carbon is more flexible but tougher. You need stiff and tough, so the best layup is a blend and the ratio depends on what is most important in each area of the frame.
In some areas (main tubes for example), the blend has more high modulus (and even ultra-high modulus) carbon. Other areas (headtube for example) use more of the tough carbon. Thatโ€™s how our frames are both light and durable.

So many marketing claims about carbon. 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. Thatโ€™s how our frames are both light and durable.

Uโ€“Turn.

The U-Turn has tire clearance in abundance. Itโ€™s also very light, thanks to another OPEN innovation: Smartmount.

The OPEN U-Turn was the first fork truly optimized for flatmount brakes by deleting the standard adaptor to switch between 140mm and 160mm disc rotors.* The adaptor is a feature without a benefit at the expense of weight, stiffness and complexity.

*
For SRAM or Shimano, remove the adaptor and use bolts recommended for a 30mm โ€œrear chainstay thicknessโ€. For Campagnolo, use a โ€œ140mm REAR disc caliperโ€ with bolts for a 30mm โ€œrear chainstay thicknessโ€.

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 U-Turn fork legs and allows us to make a very light structure with very tunable stiffness and strength.

Design is in the details.

Reviews & Awards

โ€œUltimately, Open has created what the gravel category should aspire to: exceptional comfort and unparalleled versatility.โ€

โ€“ Velonews

โ€œWith a frame design unlike any other that maximizes its versatility for both on- and off-road use, Gerard Vroomen engineered the best gravel bike to date.โ€

โ€“ Road Bike Action Magazine

โ€œAn incredible bike. Despite the mountain bike tires, you feel like youโ€™re riding a road bike. Innovative frame concept, smart details, light. With this versatility, the U.P. will likely offer an important push to the development of all gravel bikes.โ€

โ€“ Tour magazin

โ€œWhat is truly amazing is the attention Open paid to making it work exceptionally well in every configuration. The U.P. doesnโ€™t just accept different [wheel/tire] standards - each feels native. Their stated motto is โ€˜Working hard to stay smallโ€™. The quality and versatility of the Open U.P. might make that very difficult.โ€

โ€“ Peloton Magazine

โ€œIโ€™ve ridden other gravel bikes before and have often felt they compromise too much in the search for versatility โ€“ being sometimes sluggish on tarmac yet not quite capable of handling more technical trails. The UP is very different. Open has seemingly sprung light years ahead, fully realising the potential of modern tyre, wheel and frame technology. This is truly a rare and exceptional bike, and one that has literally broken new ground.โ€

โ€“ Cyclist Magazine UK

โ€œThe bike rocketed around town and to the trailhead much more aggressively than a mountain bike. Once on the gravel, the bike flowed into its comfort zone. With less aggressive geometry than a true cyclocross bike, it churned through the miles in comfort and inspired 'one more detour before we go home' type riding.โ€

โ€“ GearJunkie

โ€œThe Open U.P. will change where you ride. A long-term review of this gravel/โ€™cross/road bike proves that it really is as versatile as it promises. It feels natural on pavement and somehow still takes to the dirt like it was designed for itโ€”a blend Iโ€™ve yet to experience with other bikes.โ€

โ€“ Bicycling Magazine

The New U.P. stays ahead of the competition: โ€œThere are no question marks about this bikeโ€™s ability to have fun - thatโ€™s a guarantee whether youโ€™re entry-level or elite. Its handling, weight and design are phenomenal, lending this bike the skills to roam on tarmac, gravel or singletrack with aplomb.โ€

โ€“ Gran Fondo Cycling Magazine

โ€œWhat is truly amazing is the attention Open paid to making it work exceptionally well in every configuration. The U.P. doesnโ€™t just accept different [wheel/tire] standards - each feels native. Their stated motto is โ€˜Working hard to stay smallโ€™. The quality and versatility of the Open U.P. might make that very difficult.โ€

โ€“ Velonews

โ€œThe bike rocketed around town and to the trailhead much more aggressively than a mountain bike. Once on the gravel, the bike flowed into its comfort zone. With less aggressive geometry than a true cyclocross bike, it churned through the miles in comfort and inspired โ€šone more detour before we go homeโ€˜ type riding.โ€

โ€“ GearJunkie

Frame Specifications.

Weight Frame-only Size L, w/o metal parts ยฑ3%
Weight Frame-only Size L, w/o metal parts ยฑ3%
1040g

For the U.P. Model

880g

For the U.P.P.E.R. Model

Weight Fork-only ยฑ3%
Weight Fork-only ยฑ3%
390g

For the U.P. Model

370g

For the U.P.P.E.R. Model

Sizes
Sizes
S/M/L/XL
Stock colors
Stock colors
Various, Paint ready

For the U.P. Model

Matte black, Paint ready

For the U.P.P.E.R Model

RTP (Ready-to-paint)
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
BB standard
BB386EVO pressfit 86.5x46mm BB shell
Recommended groupsets
Recommended groupsets
Any Shimano GRX
Any SRAM AXS 
Any SRAM 1x
Campagnolo Ekar

For serious gravel and off-road (on any brand of bike), we recommend a rear derailleur with a clutch or cage damper

Front derailleur mount
Front derailleur mount
Bolt-on, removable
Front thru-axle
Front thru-axle
100x12mm superlight Carbon-Ti X-12
Front disc rotor size
Front disc rotor size
160mm only
Front brake caliper mount
Front brake caliper mount
Smartmount 160 system attaches flatmount caliper, without adaptor, for 160mm rotors
Rear thru-axle
Rear thru-axle
142x12mm superlight Carbon-Ti X-12
Rear disc rotor size
Rear disc rotor size
160mm only
Rear brake caliper mount
Rear brake caliper mount
Smartmount 160 system attaches flatmount caliper, without adaptor, for 160mm rotors
MultiStop internal system
MultiStop internal system
Di2, eTap, EPS, 1x mechanical (all groups)
Headset
Headset
Integrated IS42/28.6 | IS52/40 with 45x45 degree lower bearing)

For example Cane Creek BAA1131 (upper) + Cane Creek BAA1161 (lower), Chris King DropSet 2 or Token Omega A83

Seatpost
Seatpost
27.2mm diameter, standard set-up zero-offset
Fenders
Fenders
Compatible with clip-on style fenders 
We prefer the SKS Speedrocker
Cage mounts
Cage mounts
Seattube, downtube, under downtube
TT bag mount system
TT bag mount system
100mm front-post-to-headset-edge
Travel Bag Recommendation
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 for dimension C.

Indoor trainer compatibility
Indoor trainer compatibility
Detailed information hereโ†—
Max. weight (total rider+luggage)
Max. weight (total rider+luggage)
120kg / 264 lbs

EN/ISO/internal test standard

Warranty
Warranty
Detailed information hereโ†—
Included with frameset
Included with frameset
Headset
Seattube collar
Thru-axles
2 RD hangers
Cover bolts for FD mount posts1 FD mount
4 MultiStops (2x, 1x, Di2, eTap (only included with U.P.P.E.R.))
Cable exit stop
BB guide
Cable liners
Noise-reduction foam sleeves
Bottle cage bolts
Manual
Weight Frame-only Size L, w/o metal parts ยฑ3%

1040g

For the U.P. Model

880g

For the U.P.P.E.R. Model

Weight Fork-only ยฑ3%

390g

For the U.P. Model

370g

For the U.P.P.E.R. Model

Sizes

S/M/L/XL

Stock colors

Various, Paint ready

For the U.P. Model

Matte black, Paint ready

For the U.P.P.E.R Model

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 GRX
Any SRAM AXS (1x)
Campagnolo Ekar

For serious gravel and off-road (on any brand of bike), we recommend a rear derailleur with a clutch or cage damper

Front derailleur mount

Bolt-on, removable

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

Integrated IS42/28.6 | IS52/40 with 45x45 degree lower bearing)

For example Cane Creek BAA1131 (upper) + Cane Creek BAA1161 (lower), Chris King DropSet 2 or Token Omega A83

Seatpost

27.2mm diameter, standard set-up zero-offset

Fenders

Compatible with clip-on style fenders 

We prefer the SKS Speedrocker
Cage mounts

Seattube, downtube, under downtube

TT bag mount system

100mm front-post-to-headset-edge

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 hereโ†—

Max. weight (total rider+luggage)

120kg / 264 lbs

EN/ISO/internal test standard

Warranty

Detailed information hereโ†—

Included with frameset

Headset

Seattube collar

Thru-axles

2 RD hangers

Cover bolts for FD mount posts1 FD mount

4 MultiStops (2x, 1x, Di2, eTap (only included with U.P.P.E.R.))

Cable exit stop

BB guide

Cable liners

Noise-reduction foam sleeves

Bottle cage bolts

Manual

Geometry.

U.P. & U.P.P.E.R.
  1. Estimates; for accuracy use stack/reach of your current gravel/road bike or a fit session.
  2. Standover to the top of the toptube directly above the BB (varies with tire size).
  3. Normalized dimensions to compare to frames with standard (non-zero-offset) seattubes.
  4. Normalized dimensions to compare to frames with standard (non-zero-offset) seattubes.
S M L XL
Rider Height 1 157-170 168-180 178-191 188-201
Stack 522 551 580 604
Standover 2 743 767 791 815
Reach 365 376 387 401
Headtube Angle 69.5ยฐ 71ยฐ 72.5ยฐ 72.5ยฐ
headtube length 105 130 155 180
Fork Offset 50 50 50 50
Seattube Length 500 540 560 580
Seattube Angle 72.5ยฐ 72.5ยฐ 72.5ยฐ 72.5ยฐ
Seattube Angle (Norm.) 3 74.0ยฐ 73.5ยฐ 73.5ยฐ 73.5ยฐ
Toptube Length 528 549 570 591
Toptube Length (Norm.) 4 514 540 560 581
BB Drop 70 70 70 70
Front Center 592 598 604 622
Rear Center 420 420 420 420
Wheelbase 1002 1008 1014 1032

Build Suggestions.

Our Bike Of The Month builds below (including specs) show the kind of builds we like for the U.P. and U.P.P.E.R. and will hopefully inspire you for your own build.

Community

The OPEN community has many unique riders with unique bikes. Photos and specs are below*.

*
When youย register for warranty, you can add your bike to the gallery below.