Bossi Grit SX Frameset

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  • Regular price $5,499.90
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Bossi Grit SX 


At a glance:


The new Bossi Grit SX is a complete overhaul of the original Grit.

Full re-designed geometry for gravel grinding.

Clearance for 700c x 50 mm or 650b x 2.2" tyres.

Internal cable/hose routing.

Compatible with electronic and mechanical drivetrains.

Flip chip in the fork lets riders switch between 52 mm and 47 mm offset.

T47 bottom bracket brings the world of crankset options to the Grit SX with the benefits of threads."


“Our goal in designing the SX was to take the Grit and make it ‘more’ in every area. Better handling, more clearance, easier service, more versatility, more fun." James Bossi




Bossi Bicycles is a Sydney-based company making exclusively titanium frames, carbon wheelsets and forks, and a range of small titanium parts.

We pride ourselves on making bikes for the real world. Some brands pursue lighter, faster, stiffer, more aero. We pursue better.

Our philosophy: "Bikes that are optimised but not compromised, bikes that are light weight but durable, bikes that have refined stiffness for driveability but flex for comfort and character. As the old saying goes ‘the best bike is the one you enjoy riding the most’ and that’s what we aim to create."


The Grit SX is a complete overhaul of its predecessor with a raft of new features and reworked geometry. We have loaded the SX with everything that we'd want from a gravel/adventure bike in a package that is both tighter and more focused than the original Grit.






Frame sizes - 50, 52, 54, 56, 58, 60


Build as shot:

Bossi Grit SX frameset (54)

Bossi Carbon Gravel wheelset

Bossi Ti seatpost and stem

Shimano GRX Di2 2x groupset

Easton EC70 AX bars

Panaracer GravelKing SK 50c tyres

Selle Repente Artax saddle

Burgh Matter Stealth bartape



3AL-2.5V Titanium frame w/ 6AL-4V headtube, bottom bracket, and dropouts

Butted seatpost and downtube

Hydroformed top tube and downtube

T47i bottom bracket w/ internal routing (86mm shell)

T800 carbon fork w/ triple rack and fender mounts, dynamo hub routing, flip chip

Reversible fork offset 52/47mm

Double ovalised chainstays

Tapered and lowered seatstays

Flat mount disc brakes

12 x 100mm front and 12 x 142mm rear Thru-axle

Tapered headtube 1 1/8” – 1 1/2"

Integrated headset

Di2/ETAP compatible

3D CNC dropout

6-axis CNC yoke w/ internal routing

Internal cable routing

3x bidon mounts w/ clearance for 1L bottle

27.2mm seatpost

Laser engraved logos

Pannier rack mounts

Full rear fender mounts

Clearance for 50c(700c) and 2.2"(650b) tyres

Brush Finish

CNC engraved headtube

Chain keeper




The SX now features our fully internal routed T47 bottom bracket. T47 combines the efficiency of larger bearings with maintenance-friendly threads and compatibility with all axle diameters.

We’ve added a 3rd bidon mount on the underside of the down tube and an adjustable bidon position on the seat tube to accommodate for 1L bottles – a helpful inclusion for any bikepacking excursion.

The new 6-axis CNC yoke on the drive side chainstay is the cornerstone of the rear triangle redesign; it allows us to increase both tyre and chainring clearance, reduce chainstay length, and maintain internal cable routing.

We've made sure the Grit SX will carry you, and all of your bikepacking luggage. It's built for adventure. The new fork now features full recessed rack bolts for a cleaner profile, internal cable routing for dynamo hubs, and clearance for fenders. 

Adding to its bikepacking pedigree, the frame features rack mounts on the front fork and rear stays, 3 bidon mounts, room for 1L bottles, chain keeper for swapping wheels, internal fork routing for a dynamo hub and full fender mounts front and rear.



This isn't one of those "re-designed from the ground up" cliches, we literally went front-to-back. The Grit SX manages the naturally conflicting elements of gravel bikes. Balancing large tyre clearance, slacker front end, precise handling, stiffness, liveliness, and a comfortable ride is no small task. We believe we've done it.

The front end has been completely reworked. We've lengthened the top tube to be optimised around shorter stems and wider bars. That has the added benefit of reducing toe overlap - particularly important for running big tyres.

The heart of the changes is the fork’s new ‘flip chip’. Bust out the hex keys and you can transform the Grit SX from sensible to shred mode. The default 52mm offset results in less trail - a more road-biased setting with faster steering. 

A few minutes on the tools and you can switch to a rowdy 47 mm offset which increases trail, providing more stability but introduces more wheel flop. Helpful when navigating tight and technical terrain.

Shorter chainstays mean more direct drive and a shorter wheelbase which keeps the package feeling tight and responsive. The headtube has been lowered for a slightly more aggressive stance, balancing more weight on the bars for more feel and control.


*Subject to availability. Specifications subject to change without notice.