X90 Custom


X90 Custom Folding Bike Frame

Mountain Frame

A race-ready hard tail. Ready to accept front suspension, hydraulic disc brakes, and 26″ or 27.5″ wheels. Fork not included.

The Essentials

• Supports 10 or 11 speed cassettes • Wheel Size: 26″ or 27.5″ • Folding Time: 20 sec. • Folded Size: 36″x28″x12″ (complete) • Approx Weight: 5.875 lbs (2665 grams). • M.S.R.P: $699.99

Great For

• Race day.
• Epic mountain rides.
• Fast single track.
• Technical cross country.

Bike Sizing

• 18in Frame: For riders 5’3″ – 5’10”.
Standover height is 30″
• 20in Frame: For riders 5’11” – 6’4″.
Standover height is 31″



The Montague SwissBike X90 Custom is an aggressive folding hardtail with a stiff frame providing both performance and portability. This frame supports 26” or 27.5″ wheels; it’s a full-size bike with full-size performance, but folds to fit in the trunk of a car or in a small closet. These rugged folding bikes are built to outlast, handle any terrain, and carry a ton of gear.


X90 Custom Folding Frame Folded

Independent Review

“The more I rode this bike the more I began to enjoy myself. The tyres handled the conditions confidently, subject to the usual rules of staying off wet roots, not pushing your luck on greasy timber boardwalks, and avoiding the mud wherever possible.

At speed, the descending was stable and confident. The narrow bars compensated somewhat for the relaxed geometry so the bike was far more flickable than expected from the slack steering angle. It also meant fitting into the gaps between the trees and bridge handrails was easier. The short top tube was actually an asset when the trail pointed down, giving the bike great technical descending ability over the tricky roll-downs on my local trail. The Montague really seemed to carve on the turns, and the bike felt really sound, firm, and well planted. At no time did I notice that I was riding a “folding” bike – it seemed every bit as solid as my regular hardtail.

Braking was excellent, requiring only the index finger to pull up my 90kg riding weight with ease. Shifting was reliable and smooth despite being sprayed with mud and wet Sydney sand for the entire duration of test riding. The wheels felt strong and stiff, easily handling the beating I gave them over rough rock gardens despite the relatively low volume rubber. The suspension seat post was welcome on these trail sections! Folding this bike and reassembling it is really simple, and folding can be completed in about 20 seconds, less with practice. A neat nylon carry bag is available, and it has a separate pocket for the front wheel to avoid rubbing on the paint.

This bike is no toy. It has many admirable qualities, not least of which is its confident descending ability. With wider handlebars it will be an excellent all round hardtail. It easily folds up and is opened out again just as quickly. It is refreshing to find a full-size bike with this capability, negating the need to make the handling, performance and safety sacrifices normally associated with smaller wheels. Overall, I was pleasantly surprised by the Montague – it certainly exceeded my expectations.”

John Hawkins

Bicycle Network Australia

X90 Folding Bike Frame System Closeup

CLIX Folding System

Clever integration of the patented CLIX System allows the SwissBike X90 to be folded in under 20 seconds without the use of tools. A flip of the CLIX quick release lever on the top tube and the bike folds to a compact size.

Folding Integrated Technology

The SwissBike Swiss Military® X90 frame is designed around a patented folding system. This design means you don’t need to break the frame in order to fold the bike. Not only does this make it easier to fold, but it makes Montague bikes the strongest folding bike on the market. The Folding Integrated Technology (F.I.T.) is based around the same frame construction concepts as serious full suspension downhill bikes.

Learn More
X90 Frame Folding System Closeup


Color Black and blue front frame.  Black rear frame.
Material Custom drawn 7005 Series Aluminum tubing with FIT System.Disc mount and removable rear derailleur hanger.
Sizes 18″, 20”
Bottom Bracket 68mm English Threaded
Seat Post Diameter 30.0mm
Head Tube Diameter 1-1/8″
Fork Not included
Rear Frame O.L.D. Spacing 135mm. Vertical dropouts.
Drive Train Compatible with 10 or 11 speed cassettes.


Find a dealer or distributor to purchase your new Montague folding bike.

How to Buy

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