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Curve Cycling

GMX+ Steel Frameset

GMX+ Steel Frameset

Regular price $1,547.00 USD
Regular price Sale price $1,547.00 USD
Sale Contact Us for Info
Customers outside Australia are liable for import fees which can add 15% for EU and UK shipments (compared to Australian RRP).

Contact us for help finding the perfect size for you!

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

Alternatively, Enquire Now.

Size Guide

Take a look at our geometry page for all our frames to see what size will be best for you.


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.



- Columbus Cromor & 4130 chromoly
- 7x cage mounts
- Rear rack mounts
- Clearance max 3.0" tyres
- 1x chainring only (Max 38t)
- 12 x 148 mm (boost) spacing
- 160 mm flat mount brake (with adapter)
- 27.2 mm ID seat tube
- T47 BB (73 mm)

Seek 430 FM Fork:

- Carbon construction
- Non-suspension corrected
- 8 x M5 mounts (4 per side)
- 430 mm axle to crown
- 55 mm offset
- 15 x 110 mm (boost) spacing
- 160/180 mm flat mount brake
- 1 1/8"-1.5" tapered steerer
- 7 kg load limit (across 3 mounting points) - each side. 14 kg total.

Curve Headset:

- 44/56 mm zero-stack


- Curve 29.8 mm Black Alloy seat clamp
- Curve Cocky head badge
- 15 x 110 mm front Relaxle
- 12 x 148 mm rear Relaxle
- Carbon steerer expander
- Headset spacers (33mm total)
- Bolt-on cable guides
- Spare rear derailleur hanger
- Bolt-on cable guides, incl. 2 x offset mount support guides
- Chainstay/Seatstay cage mount adapter (size XS & SM only)



The reach on the geo chart looks long. What size is good for me?

The short answer is that the reach number may be somewhat deceiving as the frame is designed to be run with a shorter stem. That, in combination with the comparatively steep seat angle, reduces the effective reach of the frame.

Please reach out to if you have any questions about sizing.

Read more about the GMX+ geometry here: GMX+ Geo Blog

Why flat mount?

There are very few drop-bar groupsets available with post mount calipers, so we decided to introduce flat mount on GMX+ Steel to make the groupset selection for drop bar setups easier.

What are those black brackets on the downtube for?

In order to reduce the number of holes and M5 mounts added to the downtube, and to add stability to the offset mounts, we decided to make these offset mount support guides specifically for the GMX+ Steel. These guides must be used when attaching bottle cages to the offset mounts.

What are the extra plates with three holes I got with my SM or XS frame?

These are adapter brackets for the rear M5 mounts so you can attach a regular bottle cage to the back of the chainstays and seatstays. The plate is not needed for sizes MD and up.

View full details

If you are building your Curve frameset with a self-supplied groupset, please see the specification guid via the link below to ensure the necessary parts are sufficiently compatible with our framesets.

The specification details may change over time. Please check HERE for the latest version.

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Frameset Specifications for Self-Supplied Groupsets