Craftworx Ultima SL38 Aero Carbon Road Wheelset - Craftworx Cycling

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Ultima Carbon SL38 - Rim Brake Wheels



Shimano or SRAM XDR Freehub bodies available.

Please specify which option you require in the notes section when completing your order.

Every rider is different, so the design approach for all Craftworx wheels is to look at a rider profile and design wheels that deliver performance, amazing ride quality and ride dynamics specifically tuned to match that profile.

We use different rim profiles, depths and components to achieve different dynamics that then deliver a wheel to suit the intended rider profile.



The extra depth of the SL38 over the SL28 gives it some more vertical stiffness. This compliments a rider who has a little more mass and can put out some more power. The SL38's deeper profile also allows for some aero gain when the speed is higher.

The SL38 is truly the all rounder. Suitable for most riders weights, it offers the perfect dynamic balance for any road conditions, provides excellent power transfer and lateral stability for out of the saddle efforts and cornering stiffness.


Dynamically Balanced 

All Craftworx wheels are hand built to order. We use high quality bladed spokes to to create the perfect balance between even spoke tension and ultimate strength without adding unnecessary weight.

Craftworx Ultima Carbon wheels offer excellent braking performance. We worked closely with Kool Stop, an American brake pad company to develop a brake pad specifically for our wheels. These pads provide great stopping power, durability and control over your braking.

The wheels can be used with tubeless tyres or clincher tyres (with tubes) and they are supplied with the rim tape fitted.

These wheels are optimised for 25 and 28mm tyres but you can easily use down to 23mm tyres and when clearance allows tyres up to 32mm will also fit on these wheels.


Rims – Ultima SL38 Carbon - 38mm Deep – 27.5mm Wide (Internal) 20.7mm Wide (Internal)

Tyres – Tubeless or Clincher (with tubes) 23, 25, 28 and 32mm Tyres

Hubs – Craftworx Ultima 6 – Sealed Bearings – 72 Engagement Points – For Shimano/SRAM 10/11 Speed, Campagnolo 10,11 or 12 Speed or SRAM 12 Speed (XDR)

Spokes – Triple Butted Stainless Steel – 20 Front/24 Rear

Nipples – Alloy Black

Weight – 1406 grams

Supplied with Tubeless Rim Tape fitted and Craftworx Ultima Carbon Brake Pads


Hand Built to order in 3-4 days in Brisbane.




Customer Reviews

Based on 32 reviews
Peter Taylor
Another great looking set of wheels

Bit early for a review but high expectations. This will be my second pair of Ultima hoops. Previous wheels still going well after quite a few years. The new rims mark my transition to disc brakes so can't wait to get the bike built and try out the latest set. Look great out of the box so far and expect the performance to match based on past experience.

Pete Whiter
Amazing wheels

Have always wanted a proper set of carbon wheels but hard to justify the pretty steep prices. Big thanks (& congrats) to the Craftworx team for the 10th anniversary sale for the excuse to take the plunge.
Boy I wish I'd gotten them much sooner, they are amazing in so many ways. Even in the delivery box they're lighter than my lightest current wheelset :)
The bike is now so much more responsive, it just leaps forward and I find myself changing up to an easier gear much less often. Braking performance is remarkable, loads of modulation & power - better than my alum wheels which was a surprise.
Most remarkable though is the increased comfort - I actually checked tyre pressures. Was not expecting that from 50mm deep aero wheels.
Abosutely perfect build quality (of course) & always a pleasure to deal with the Craftworx crew.
Certainly the most lavish bike purchase I've made but worth every cent.
Thanks so much Mark & the team at Craftworx

Juzzy F
So Far So Brilliant!

Very Very VERY HAPPY with these wheels even though it's earlydays. Upgrading from stock wheels on my BMC these have made a huge difference.
Love the smooth rolling of these wheels the sound coming out of my SL38's and the look cool to! Customer service and assistance is second to none as well. Discussing with the Craftworx team prior to purchase made the decision so much easier.

Brad Sayer
Ultima SL28 - positive, light and lively

Super impressed with the new Craftworx wheel set. The SL28s have added a light and lively feel to the bike, particularly under acceleration. They feel great on steeper climbs and respond very positively to each pedal stroke. The ride seems smoother and more sophisticated too, they seem to have added a nice touch of controlled and sympathetic damping to the ride quality. TLDR: great wheel set, would buy again!

Adam Lewis

Lovely people to deal with and great advice, rims are mint! Very happy