Core SL
The Core SL is our most advanced road wheelset to date. Lightweight, responsive, and built to last.
The SL combines a new carbon layup, ceramic bearings, and ultra-light unidirectional carbon spokes into a package that’s both lightweight and remarkably resilient.
At just 1275 grams, the Core SL shaves meaningful rotational mass, delivering sharper acceleration and greater responsiveness under load. Its 50mm rim depth strikes a balance between aerodynamic efficiency and predictable handling, while the 23mm internal width pairs seamlessly with wider tyre profiles to enhance aerodynamics and grip. The hooked rim design ensures broad tyre compatibility and easy tubeless setup.
What sets the Core SL apart is its spoke system. We’ve developed new UD carbon spokes specifically for this wheelset, engineered to improve lateral stiffness while significantly reducing weight. Compared to a traditional steel build, the result is over 200 grams saved and a tighter, more reactive ride feel that rewards every effort.
At the centre is the new Bossi Core SL hubset, equipped with TPI ceramic bearings for reduced rolling resistance and lasting durability. The spoke layout—20 front, 24 rear is optimised for a balance of strength, stiffness, and weight. Like every Bossi wheelset, the Core SL is hand-built to exacting tolerances for consistency you can count on.
Visually, the UD marble finish is subtle but distinct. No two sets are identical. The natural variance in the layup reflects the bespoke nature of the product. Eye-catching. Purposeful. Design values that permeate all our products
The Core SL is designed for performance, but built for the long haul. It reflects everything we stand for: minimalist, functional, and quietly confident.Specs
RIM
- 50mm T800-T1000 carbon rim, tubeless ready
- 23mm hooked internal rim width (25mm wall to wall)
- 30.5mm external rim width, aerodynamically optimised for 28-30c tyres.
- Reinforced nipple hole patching
- Counterbalance balast patch opposite valve
- Laser engraved logos
- Marbled carbon finish
- 120 PSI max tyre pressure
- ERD = 539mm
HUB
- TPI Ceramic bearings front and rear
- Star ratchet, 45T, 8 degree engagement
- Rear lacing pattern - 24 spoke, 2:1, Cross 2 DS and NDS
- Front lacing pattern - 20 spoke, 1:1, Cross 2 DS and NDS
- 7075-T6 Forged alloy /heat treated hub body
- 7075-T6 CNC axles
WHEEL
- T1000 UD carbon bladed spokes, T head, threaded
- External nipple, black anodized
- 5 year warranty
- 120kg system limit
- 1275g +/- 15g
Features
01
Fast. predictable.
Experience enhanced control with our new 50mm rim. Designed for aerodynamic efficiency without compromising stability. Confident and predictable, even in crosswinds. Featuring an all new layup with T800/T1000 fiber, our new rim is lighter, and stiffer than its predecessor.
02
UD Carbon Aero Spokes
Boasting exceptionally high strength-to-weight and deep aero design. Our unidirectional carbon spokes weigh less than 3 grams each. The material offers significantly higher tensile strength compared to traditional steel spokes, contributing to improved lateral stiffness and responsiveness under load.
03
Fast rolling. reliable drive.
Our all-new Core-SL hubset is purpose-built for carbon spokes. It features premium TPI ceramic bearings and a 45-tooth ratchet system for reliable engagement and easy serviceability. Large flanges for optimal bracing angles and tangentially laced spokes for maximum torsional stiffness
04
Marble Weave Finish
Our new raw, unpainted aesthetic that celebrates the true nature of unidirectional carbon fiber. Each rim reveals a unique marbled texture, formed during the molding process and never exactly replicated. Just like our bikes, no two are ever the same. Showing off the craftsmanship, material integrity, and individuality that define every Bossi bike.
05
Laser engraved logos
We've used laser engraving to apply a subtle, refined finish to our rim branding. The process is carefully controlled to etch only the surface weave, leaving the structural carbon layers untouched. The engraving ensures your graphics can't peel or scratch off over time.
06
Forged hub body
The new forged 7075 hub body is light, stiff, and durable resulting in exceptional performance and stability. Bearing interfaces are precision machined to ensure perfect fit, improving performance and extending lifespan.
07
External nipples
We use external nipples for easier maintenance and long-term serviceability. Alowing for for quick and precise truing without the need to remove tyres or rim tape, making it easier to keep your wheels running perfectly true. It’s a practical choice that prioritises performance and reliability.
08
Cleaver lacing
2:1 tangentially laced spokes keep spoke tension even on both sides of the wheel and improve bracing compared to conventional radial lacing. The unique 2:1 tangentially laced spokes ensure consistent spoke tension and enhance stability.
Core-SL
We built this wheel to be light, stiff, fast, and seriously pretty. Our newest carbon rim combines an ultra-lightweight construction with a unique marbled carbon weave. Our new aero carbon spokes reduce weight further and improve responsiveness, giving you the perfect balance of speed and stiffnes. The wheelset features our new Core-SL hubset, a lighter construction and a move to ratchet internals and assembled with TPI ceramic bearings as standard. These wheels deliver a ride that feels fast and effortless. And like everything we make, they’re built to go the distance. Designed for riders who demand both style and substance.
Core SL
Details
The build
Each wheelset comes with DT Swiss tubeless tape installed, tubeless valves, spare spokes, and wheel build report. As standard wheelsets are shipped with Shimano 11s freehub bodies. For XD/ XDR/ or Campagnolo, please make notes in checkout.
How to order
As each wheelset is custom built, we recommend getting in touch with our expert team to discuss your needs. We can help provide information on componentry and advise you on which model would be best suited to your riding. If all parts are in stock we can build and dispatch orders within 48 hours.
Checkout notes
Freehubs:We offer Shimano, SRAM XD/XDR, and Campagnolo Freehubs. Please specify your desired freehub in checkout notes
Shipping
We offer complimentary domestic shipping within Australia on orders over $200. International shipping is heavily subsidised by Bossi, with flat rates available for framesets and complete bikes. For shipping rates, delivery estimates, and import tax information, please visit our Shipping page.
Warranty
5-Year Warranty
Bossi carbon wheels are covered by a 5-year warranty against manufacturing defects in materials and workmanship. This warranty applies to the original owner and covers failures resulting from normal, intended use. It does not cover damage caused by accidents, misuse, improper installation, or unauthorized modifications.
Lifetime Crash Replacement Program
For added peace of mind, we offer a lifetime crash replacement program. If your wheels are damaged in a crash or other non-warranty situation, we’ll offer a replacement at 50% off the current retail price. This program is available to the original owner for the life of the product.
Testing
Flatness < 0.15mm
Roundness < 0.15mm
Vertical Drop Test = 80J (UCI requires only 40J)
Tyre Pressure Test = 150PSI @ < 0.3mm deformation
Compression Destructive Test = 664.4KgF
Spoke Tension Test = Safe limit 150KgF, Destruction @ 469KgF
Speak to us
If you have questions about any of our products or would like to schedule a consultation to plan a custom build, please get in touch.