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Belgie ULTRA

Belgie ULTRA

Regular price $4,867.00 USD
Regular price Sale price $4,867.00 USD
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Customers outside Australia are liable for import fees which can add 15% for EU and UK shipments (compared to Australian RRP).

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For info on availability, please contact,
call us on 03 9088 0274

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Free International Shipping for all Framesets, Complete Bikes, Forks, Wheelsets, Bars and Rocket Pooches is included in the sales price (*excludes Belgie DISC Ultegra)

All other products are subject to shipping charges calculated at checkout. See our Shipping Policy for further details.


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Where It All Started

The Belgie is affectionately named after Melbourne's infamous "Belgie Ride,” a short, sharp, mixed terrain shop ride that often resembles a CX race rather than a road ride.

Then after Jesse’s success in winning the 2015 Trans Am Bike Race, we wanted to develop the Belgie name further, highlighting the spirit of Australian endurance cycling. So the Belgie SPIRIT was born in 2016 to take on the 5,545km Indian Pacific Wheel Race, celebrating the rich history of the Overlanders from the 1890s. 

Furthermore, through feedback from endurance riders and athletes worldwide, we continued to develop this frame again, improving handling, cornering, clearance for light gravel tyres and now featuring bento box mounting points. As a result, we now call this version the Belgie ULTRA.

  • Lighter and Sleeker

    The Belgie ULTRA has thinner 16 mm seat stay tubing and an updated tapered head tube, resulting in a sleeker frame design and considerable weight savings.

    At 1630 grams, the Belgie ULTRA 56 frame is 180 grams lighter than the previous model.

  • Stability and Improved Geometry

    Longer chainstays, front centre, and overall wheelbase across all sizes. A taller stack and extended reach help make the ULTRA more comfortable on day long rides. This also helps minimise pesky toe overlap when using a wider tyre. This improved geometry makes the Ultra perfect for those long road kilometres, but also makes the Ultra perfect for fast, light gravel.

    The ULTRA features our Race 370 fork, resulting in tyre clearance of up to 33 mm. Both frame and fork can accomodate 33 mm CX/gravel tyres for greater off-road stability and grip.

  • Bento Box + Extra Storage Space

    The Belgie ULTRA features Bento Box mounting points on the top tube allowing riders to secure belongings in most bolt-on bike bags. We have also increased the size of the front triangle, allowing more storage capacity for top tube frame bags and water bottles.

    There is ample room for bikepacking bags on all frameset sizes. To make sure current, prospective or custom bagging fits your frame size please see our Bagmaker Drawing page.

  • Mechanical versus Electric

    Thanks to some improvements in engineering, the Belgie frame is now compatible with both electronic and mechanical gear systems. So you can now have your pick of eTap, Di2, or standard mechanical options.

  • Want to Carry More?

    With a wide range of frame and fork mounted rack systems on the market, and with more appearing every week, it is important to understand which rack systems are compatible with your Curve frame and fork, and how to mount them correctly in order to ensure safe riding, avoid damage and voiding your warranty. Before mounting a rack, we strongly recommend you get in touch with us to confirm compatibility and the correct mounting procedure. This will minimise the risk of injury, product damage and voiding your warranty. Your local Curve dealer, or the team at Curve HQ, can also help you select a rack system and mount it to your bike for you.

Belgie ULTRA Specifications


Frame - Titanium Curve Belgie ULTRA (1630 g Size 56)

Fork - Curve Race 370 (Max clearance: 33 mm)

Headset - Curve Integrated 42/52 mm semi-internal

Seat Clamp - Curve Alloy 31.8 mm

Other - Curve Cocky Headbadge, 12 mm Front & Rear Axles, spare rear derailleur hanger

Important Note: Please be aware that due to the steerer length of the Ride 370 fork (300mm), when paired with Ultra frames in sizes 61 and 64 only 10mm and 0mm of spacers will fit under the stem, respectively, due to the longer headtubes (61 cm - 240 mm, 64 cm - 250 mm).

If more stack is needed, an alternate fork with a longer steerer tube may be required. Please Contact Us to talk through possible options if this may affect you.

Groupset Options

SRAM Force AXS 12 sp

Shifter/Levers - Force AXS 2x12 sp - LHR / RHF

Brakes - Force AXS HRD Flat Mount Disc // CLX R CL Rotors 160 mm

Crank - Force DUB - 46/33 | 46-49 cm: 165 mm | 52-54 cm: 170 mm | 56-64 cm: 175 mm

Bottom Bracket - Curve T47 DUB 68 mm

Derailleur F & R - Force AXS 2x12 sp (RD Max 36t)

Cassette - XG 1270 10-36t 12 sp

Chain - Force 12 sp


SRAM Rival AXS 12 sp

Shifter/Levers - Rival AXS 2x12 sp - LHR / RHF

Brakes - Rival Flat Mount Disc // CL Rotors 160 mm

Crank - Rival DUB - 46/33 | 46-49 cm: 165 mm | 52-54 cm: 170 mm | 56-64 cm: 175 mm

Bottom Bracket - Curve T47 DUB 68 mm

Derailleur F & R - Rival AXS D1 12 sp (RD Max 36t)

Cassette - XG 1250 D1 10-36t 12 sp

Chain - Rival D1 12 sp


Curve G4T 35 mm or 45 mm - 700C

Carbon All-Road Wheels:

- 21 mm internal, 28 mm external, 35 / 45 mm deep

- Hub: DT Swiss 350 24H Centre Lock

- Spokes & Nipples: Sapim CX Ray & Brass

- Axle Spacing: 12 x 100 mm front, 12 x 142 mm rear

Finishing Kit

Bars - Curve Walmer Bar | 46 - 52: 40 cm | 54 - 64: 43 cm

Stem - Zipp SC SL | SC with Rival builds

Seatpost - Zipp SC SL 0° | SC with Rival

Saddle - Fi'zi:k Vento Argo

Tyres - Rubino Pro TLR 700 x 30c

Bar Tape - Curve black anti-shock

Please Note: Spec subject to change according to availability

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