Jump to
  • Gallery
  • Specs
  • Geo
  • Reviews

Belgie ULTRA

Our all-road titanium road bike has just gone ULTRA. After 4 years of stories and adventures, we've updated our Belgie Spirit and renamed it the Belgie ULTRA.



Ultra Endurance Road riding

Meticulously designed and finely crafted for all-road Australian ultra-endurance riding. The ULTRA can tackle cobbles and light gravel with confidence, helped by wider tyre clearance and a lengthened wheelbase. You’ll soon discover your spirit of adventure with this titanium all-round all-roader.

All Road, All Day

Curve Titanium Road Bike


Curve's rich history was founded upon adventure cycling, and our bikes are often designed with a specific purpose or adventure in mind. 

After Jesse’s success in winning the 2015 Trans Am Bike Race, we wanted to take the Belgie name further and capture the spirit of Australian endurance cycling, so we designed the Belgie Spirit to take on the 5,545km Indian Pacific Wheel Race and celebrate the rich history of the Overlanders from the 1890’s. 

Released in 2016, the Spirit was optimised for long days in the saddle on all types of road. It’s been enjoyed by ultra-endurance cyclists, commuters, roadies, randonneurs and ordinary cyclists looking for a comfortable high-end road bike.

Over the years this bike has seen many adventures, more than we can possibly recount without signing a book deal. So with our accumulated knowledge and experience, we decided to refine and tweak the Spirit into a better version of itself, which we now call the...

Our Spirit goes ULTRA.

Asset 2 Sizing  & Geometry

Asset 3 Bike Size 46 49 52 54 56 58 61 64
Asset 5 Rider Height. Range in cm 147-157 155-165 161-170 168-177 175-184 183-192 191-201 198-208
Asset 4 Pedal to Saddle Height. In mm 610-670 650-710 680-735 715-760 740-780 770-815 805-850 840-890

*All measurements in mm. Match your measurements to guide your bike size. If unsure, hit the green Contact Us button.

Titanium Bike Frame

Frameset Includes


Titanium Curve Belgie ULTRA

1636 g for a size 56 (Belgie V3 1630 g)

Fork Curve Race 370
Headset Curve Integrated 42/52cmm semi-internal
Seat Clamp Curve Alloy 31.8mm (27.2 mm seat post diameter)
Bento Box Mounts on top tube are placed 64mm apart. (76mm from the outer diameter of the headtube)

Curve Cocky Headbadge
12mm x 100 mm front & 12 x 142 mm rear axles

Full build with SRAM Force AXS: 8514 g for a size 56
(Belgie V3: 8508 g)


SRAM Force AXS eTap 12sp
Shifter/Levers Force eTap AXS 2x12 sp - LHR / RHF
Brakes Force eTap AXS HRD Flat Mount Disc
CLX R CL Rotors 160mm (Note: 140 - 160 mm front; 140 mm rear / 160 mm w/adapter) (Caliper bolt length: 15 mm F&R)
Crank Force 2x12sp DUB 48/35t (Max Chainring: 2x - 53/39; 1x >46t)
Bottom Bracket Curve T47 DUB 68mm
Derailleur F & R Force AXS eTap 2x12sp (31.8 mm clamp for front)
Cassette XG 1270 10-36t 12sp
Chain Force 12sp


G4T 35 - 700C Curve carbon all-road wheels
21mm internal, 28mm external, 35mm deep
Hub: DT Swiss 350 24H Centre Lock
Spokes & Nipples: Sapim CX Ray & Brass

Finishing Kit

Bars + Stem Zipp SC SL Beyond Black
Seatpost Zipp SC SL - Zero Setback
Saddle Fi’zi:k Vento Argo R5
Tyres Rubino Pro TLR 700 x 30c
Bar Tape Curve - black anti-shock

Please Note:

Spec subject to change according to availability


Why are framesets available so much sooner than complete bikes? SRAM and other suppliers in Taiwan are experiencing extremely long lead times on parts and accessories
When shipping direct, how does a complete bike come finished to me? Each bike is built and boxed to "90% complete" with the fork steerer uncut and bar tape is not wrapped. We do this so each individual can personalise their setup options. This final procedure should be performed by an experienced bike mechanic.

Ready for your next adventure?

I don't want the adventure