Juliana Bicycles Roubion MX Full Suspension Mountain Bike
Juliana Bicycles Roubion MX Full Suspension Mountain Bike


  • Overview
  • Bike Builder
  • Geometry and Sizing
  • Technical Support
  • Warranty

Ready to rally the World.

A 1:25000 scale map, a weather forecast and the Roubion. Three things you shouldn’t hit the high mountains without. And while we can’t guarantee you won’t get lost or soaked, we’re pretty sure there’s no better bike to tackle ancient alpine terrain.

And whether blind racing or just blindly enjoying the trails as they come, the Roubion’s MX wheel combo feels like the best mix since Aperol met spritz. A 29-inch front wheel serves up high-speed stability and high-rolling confidence. Meanwhile the 27.5-inch rear makes for an intuitive and highly maneuverable rear end that loves to get sideways around the most ragged of switchbacks.

This bike is rapid, so when it comes to stopping power and control we’ve mixed things up here also. A 200mm front and 180mm rear brake rotor pairing ensures you shouldn’t overcook the corners no matter how hot you’re coming in. The Roubion’s chainstay lengths are all specifically sized for the XS, S and M frames too, meaning handling remains consistent across the range. And like all Juliana’s, each shock is tuned to work better for slightly lighter riders than equivalent Santa Cruz models.

  • Looking for a smoother ride with more straight line speed? Maverick might be your jam.
  • Not riding such big/tech terrain? The Joplin or Furtado might be more suitable.

Key Features:

Available in: Carbon C and Carbon CC
Wheel Size: MX
Front Travel: 160mm
Rear Travel: 150mm

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Santa Cruz Dealer Logo: Mike's Bikes
Santa Cruz Dealer Logo: Evo
Santa Cruz Dealer Logo: Competitive Cyclist


Reach 405430455
Stack 594617626
Head Tube Angle 64.7°64.7°64.7°
Seat Tube Length 370380405
Front Center 722757786
BB Height 344344344
BB Drop 1029/1029/10
Wheelbase 114911881221
Rear Center 427431435
Head Tube Length 110100110
Top Tube Length 536570599
Seat Tube Angle 77.6°77.2°77.1°
Standover Height 701709731



Frame Sizing

If you're on the cusp between the recommended height range of two sizes, the absolute best thing is to try to ride them both. At a minimum, check the stack/reach measurements on your current bike and compare it to the new model you are looking at to get an idea of a fit you are already comfortable with. If riding the bike is not an option, consider the following.

Personal Preference

A larger size frame will be more stable, and will give you more room to move without upsetting the weight-balance of the bike. The larger size will put the front wheel further in front of you, which gives the feeling of security and conversely, it will require more significant body movements when you WANT to shift the weight-bias of the bike. Think hard about your riding style and how active/intuitive you want it to be vs stable and speedy. You'll need to work a bit harder to muscle the larger bike around.

Body Dimension

Not all bodies at a given height are the same. If you have longer legs and a shorter torso than the average person your height, that may push you towards the smaller of the recommended sizes. If you're all torso and arms, most likely you'll want to size up.



142 - 155cm
142 - 155cm


155 - 165cm
155 - 165cm


165 - 175cm
165 - 175cm


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Design Details

Design Details

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Travel for Days

150mm of VPP® lower link rear travel and a 160mm fork

Best of both Worlds

High-speed stability and confidence are fixed variables of the 29-inch front wheel, plus you get the 27.5 rear maneuverability for snappy moves, playing for style points, and negotiating hairy switchbacks

Geometry to match

The Roubion's chainstay length is matched to frame size so every rider, no matter their height, gets the same balanced geometry and bike fit

Low standover height

Juliana's sloping top tubes always assures confidence for shorter legged riders

Size XS

More options for smaller riders

Maintenance Information

Reserve Wheels

How to find your serial number

Something not right? Use our warranty claim form to file a claim. We'll do everything we can to get you back to riding as fast as possible.

File a claim for a Santa Cruz product

If you have any other questions or would like to follow up on a warranty claim, contact our Warranty Department.

Roubion Tech Support

Download the shock setup PDF for this bike and get even more detailed sag, high/low rebound, and high/low compression recommendations for shocks below and get recommendations for the fork in each build.

Fox Float Performance

Rider WeightAir PressureShock Sag
100lbs (45.5kg)105 psi16.5-19 mm
120lbs (54.4kg)125 psi16.5-19 mm
140lbs (63.5kg)145 psi16.5-19 mm
160lbs (72.6kg)165 psi16.5-19 mm
180lbs (81.8kg)185 psi16.5-19 mm
200lbs (90.7kg)205 psi16.5-19 mm
220lbs (99.8kg)225 psi16.5-19 mm
240lbs (108.8kg)245 psi16.5-19 mm
260lbs (117.9kg)265 psi16.5-19 mm

RockShox Super Deluxe Ultimate

Rider WeightAir PressureShock Sag
100lbs (45.5kg)85 psi16.5-19 mm
120lbs (54.4kg)105 psi16.5-19 mm
140lbs (63.5kg)130 psi16.5-19 mm
160lbs (72.6kg)150 psi16.5-19 mm
180lbs (81.8kg)175 psi16.5-19 mm
200lbs (90.7kg)195 psi16.5-19 mm
220lbs (99.8kg)220 psi16.5-19 mm
240lbs (108.8kg)240 psi16.5-19 mm
260lbs (117.9kg)265 psi16.5-19 mm

Can I put a 27.5 front wheel on the Roubion?

These bikes are designed specifically to use mixed wheels. We do not recommend a 27.5 front wheel for geometry reasons. The XS size is the exception as it's designed for 27.5".

Do all sizes use MX wheels?

The XS size Roubion uses 27.5" wheels front and rear. All other sizes are MX

I see there are different chainstay lengths for each size bike. Can I buy a different swingarm to customize the length on my bike?

The chainstay length change occurs in the front triangles- we vary the pivot locations fore and aft to achieve the different lengths while using a single size swingarm. So no- you cannot get the chainstay length of the small on your size large, for instance.

I'm coming from a 27.5 bike- what will feel different with MX? Any setup tips?

An MX bike will definitely handle differently than a full 27.5 bike. The main difference you'll feel is a more stable and confident front end. The turning will be a bit slower than a 27.5, but the payoff is a more secure feeling in corners and more traction. Due to the taller front axle height and improved roll-over of the large wheel, your chances of stuffing the front wheel or going over the bars is vastly diminished. Use this security to ride challenging terrain with a more aggressive and dynamic body position.

I've been riding 29ers for a while- what will feel different with MX? Any setup tips?

29" bikes provide a ton of front wheel grip- this is partially due to the front wheel itself, but also due to the axle height of the rear wheel which works to keep the front end weighted. This creates a natural position on lower-angle terrain but requires body position and/or setup adjustments to achieve any sort of rearward bias.

On an MX bike, the bias is more rearward. This gives a very natural feeling on steep descents, but requires some body position and setup consideration for a balanced feel on flatter terrain. Compared to a 29er, a slightly lower handlebar and a more forward-biased suspension setup will make an MX bike feel more like what you're used to. Additionally, using the Hi BB setting will lend itself to a more front biased feel. Using these tuning parameters will help you find the sweet spot for your terrain and preference.

You'll know you have it dialed when it feels like you're never making large bodyweight shifts to either lift the front end or keep it stuck to the ground.

What fork offset is the recommended?

The Roubion comes with 42-44mm offset forks, and this is what we recommend for optimal handling. The size XS come with a 37mm offset 27.5" fork

What's the largest rear rotor that will fit on the Roubion?

The minimum is 180mm (direct mount) and the largest is 223mm

Why are there two different measurements listed for BB Drop?

BB drop is the measurement between the center of the bottom bracket and the front and rear axles. Because the Roubion (S-M) comes with two different wheel sizes the BB drop is greater up front.

Why MX (Mixed Wheels)?

Mixed wheels provide the stability and traction of a 29" front wheel with the agility of a 27.5" rear wheel. The smaller rear wheel and its comparatively lower axle height allows the rider to more easily unweight the front wheel- this makes for confident yet agile handling on the steepest of descents.

Anka Martin's 2022 Roubion next to her land cruiser with an open rooftop tent
Anka Martin's 2022 Roubion next to her land cruiser with an open rooftop tent

Lifetime Warranty and Support

Missing a ride sucks. That's why we build the very best bikes and offer legendary rider support for life so that you don't.

Evelyn Dong adjusting her 2022 Wilder

If you know the difference between a wrench and a spanner then we have a host of simple-to-follow guides for the basic service jobs.

Multiple Santa Cruz Bicycle Frames

We design our bikes to last, to be easy to work on and we make sure to provide the parts and information so you can make your bike last for many lifetimes.

We take No Missed Rides seriously, so we keep stock of every small part and spare to keep you rolling. Head over to the shop to find what you need.