Fully Integrated Gravel

Grit SS

Gravel performance, fully resolved.

A high-performance titanium gravel platform built for road speed, off-road control, and long mixed-surface riding.

Complete bikes from $11,970.00 AUD

Framesets from $5,650.00 AUD

Fast in road trim, composed off-road, and fully equipped for long mixed-surface rides. Built for riders who want one platform to cover more of their riding without asking it to compromise on any of it.

Key features

01
High Performance Gravel
The Grit SS is built for riders who want a faster, more focused gravel platform for mixed-surface riding. Aerodynamically optimised tube profiles help it hold speed efficiently on the road, while deeper tube sections provide the stiffness needed for direct power transfer under load. Paired with purposeful gravel geometry, the result is a fast, controlled character across dirt, hardpack, and rougher roads.
02
Sharp handling
The Grit SS is built around a long wheelbase and balanced front-end geometry for confident, stable handling on loose and unpredictable surfaces. A higher stack creates a more balanced riding position with better visibility and more even weight distribution. Up front, a 50 mm fork offset maintains sharp, accurate steering without nervousness. Bottom bracket drop is set to balance ground clearance with a lower centre of gravity, keeping the bike planted without limiting off-road capability.
03
Integrated modern standards
Fully integrated cable routing, 3D-printed UDH dropouts, a T47 bottom bracket, clearance for modern high-volume tyres, and a 27.2 mm seatpost give the Grit SS the standards and compatibility expected of a contemporary gravel platform. A cleaner bike, broad component choice, dropper and suspension post support, and long-term relevance as gravel setups continue to evolve.
04
Utility
The Grit SS supports a wide range of configurations. It can be set up fast and light for road and all-road riding, or fully equipped for longer mixed-surface routes and bikepacking. Rack and mudguard mounts, triple mounts on the fork, integrated computer mounting, and compatibility with one-piece and two-piece cockpit systems give the platform genuine flexibility without visual clutter.
05
Advanced titanium construction
The Grit SS combines 3D-printed titanium junctions, hydroformed tube profiles, and linished welds to create a frame with shaping freedom and refinement not possible through conventional construction. Aerodynamic forms and deeper profiles improve speed and stiffness, while the clean, highly resolved finish reflects the quality of the engineering beneath it. Titanium remains the material solution to gravel's real demands: durability, corrosion resistance, vibration damping, and the ride quality that helps reduce chatter and fatigue over rougher surfaces and longer distances.

Design brief

Fast. Direct. Sculpted. Integrated. Durable. Versatile. Purposeful.

The Grit SS was developed as a high-performance titanium platform for road, all-road, and gravel use. Gravel bikes have become faster, more integrated, and more road-influenced. The opportunity was to create a titanium frame that could carry speed on sealed roads and hardpack while retaining the clearance, durability, mounting points, and ride quality required for serious gravel riding.

The design objective was to support two distinct setups from the same frame. With gravel wheels and larger tyres, the Grit SS prioritises stability, traction, damping, and control across dirt, hardpack, and broken roads. With road wheels and deeper rims, the frame takes on a sharper all-road character, supported by aero-profiled tubing, integrated routing, and increased frame stiffness.

Hydroformed titanium tubes allow deeper, more directional profiles through the front triangle, improving stiffness and supporting aerodynamic forms. 3D-printed titanium junctions create cleaner structural transitions between the head tube, down tube, yoke, and dropouts, carrying integration, internal routing, UDH compatibility, and tyre clearance in a more resolved structure.

Utility was retained deliberately. Generous tyre clearance, practical mounting points, T47, UDH, and titanium durability allow the Grit SS to be built for fast all-road riding, gravel, longer mixed-surface routes, or loaded setups without narrowing the frame to one use case.

The result is Bossi's most complete road-and-gravel platform: fast in road trim, stable off-road, practical for longer rides, and durable for long-term use.

How it rides

The Grit SS is a high-performance gravel and all-road platform designed to cover road and gravel with equal intent. In road trim, it rewards speed, efficient power delivery, and fast changes in pace. In gravel trim, it prioritises stability, control, and durability across hardpack, broken roads, and longer mixed-surface routes.

The fit is road-influenced without becoming overly aggressive for off-road use. A balanced stack and reach place the rider in a performance position that supports power transfer, visibility, and upper-body control over uneven terrain. The position is efficient for sealed-road riding, while remaining stable and manageable when the bike is fitted with larger tyres or ridden over rougher surfaces.

The handling geometry is central to the Grit SS brief. A 71.2° head tube angle and long front-centre reduce toe overlap, improve stability with larger tyres, and support confident handling at speed. With high-volume gravel tyres, trail sits in a stable gravel range for control on dirt and broken surfaces. With narrower road tyres and deeper road wheels, trail reduces and the bike takes on a sharper all-road character. The 76 mm bottom bracket drop lowers centre of gravity for cornering stability, while the long rear-centre supports tyre clearance, traction, and loaded utility without dulling response under power.

The frame construction sharpens the ride compared with a conventional round-tube gravel frame. Hydroformed aero profiles and 3D-printed titanium junctions improve stiffness through the front triangle, head tube, and bottom bracket areas, increasing precision under load and helping the bike hold speed in road trim. Titanium’s damping remains central to the ride quality, managing vibration and repeated impacts so the bike feels controlled off-road and less fatiguing over distance.

3D-printed titanium head tube
The oversized 3D-printed head tube is central to the Grit SS, allowing a stiffer, more confident front end and giving the frame its distinctive integrated form.
3D-printed yoke
A printed yoke not only allows for wider chainring and tyre clearance but maintains internal cable routing and produces a seemless integrated finish.
Hydroformed aero tubes
The hydroformed tube set gives the Grit SS its aerodynamic profile, purposeful stiffness and highly sculpted form
Fully Integrated
Delivers a cleaner front end and a more resolved overall presentation.
Linished Welds
Welds are linished smooth by hand for a near seamless connection. The process is highly labour-intensive, but it is central to the Grit SS’s refined finish.

Built in the Details

35 hours
Total production time for a single frame
From tube preparation and machining through 3D printing, welding, finishing and final QC.
7 Hours
Time required to weld a single frame.

A double-pass welding process ensures strength, consistency and a cleaner final result.
8 hours
Time spent linishing and finishing each frame.

Every tube-to-junction weld is smoothed by hand for a near seamless connection and highly resolved finish.
13 checks
Quality control inspections before approval.

From individual parts to the finished frame, every stage is inspected and confirmed.
90% by hand
Share of the production process carried out manually.

Cutting, mitring, welding, finishing, alignment and final detail work are all completed by skilled hands.
ISO 4210 +15%
Tested beyond the industry standard.
Each production run is validated for strength and durability above ISO requirements.

Grit SS

Geometry

Size 50 52 54 56 58 60

Compare with

Stack: 567 mm
Reach: 381 mm
Effective top tube: 549 mm
Rider height: 173–178 cm

Measurement	50	52	54	56	58	60
AEffective top tube	526	534	549	565	582	597
BReach	373	373	381	388	395	401
CStack	542	554	567	586	605	620.5
DHead tube length	116	125	140	160	180	195
EHead tube angle	70.2°	71°	71.2°	71.2°	71.75°	72°
FSeat tube angle	74.25°	73.75°	73.5°	73.25°	72.75°	72.5°
GSeat tube length (c-c)	455	475	490	510	530	550
HChainstay length	435	435	435	435	435	435
IWheelbase	1023	1020	1031	1049	1053	1062
JFront centre	598	595	605	619	627	635
KBB drop	78	78	76	76	74	74
LFork offset	50	50	50	50	50	50
Frame weight	1695g	1735g	1760g	1790g	1860g	1905g
Fork weight	540g	540g	540g	540g	540g	540g
Rider height (cm)	160–168	168–173	173–178	178–183	183–188	188–196

Measurements in millimetres unless shown otherwise.

Find your size

Your height in cm

These height ranges are approximate only. Some riders may fall between sizes depending on leg length, torso length, arm length, mobility and desired riding position. If you are unsure which size is right for you, we recommend getting in touch before ordering.

Book a consultation

Core builds

Core Builds are configured through the options in the bike builder. Each build includes a curated specification, with selected rider-specific choices such as cockpit sizing, gearing, wheelset, tyres, saddle, and other available options confirmed before checkout.

Each Bossi is built to order. Once your order is placed, we will review your selected specification, confirm component availability, and provide an estimated build date. Typical Core Build lead times are 2–4 weeks, depending on frame availability, component supply, and current workshop scheduling.

Core Builds are limited to the options shown on this page. If you have a specific specification, component request, or more involved build in mind, please contact us to discuss a Custom Project.

Rival AXS XPLR E1
- Bossi Grit SS frameset
- SRAM Rival AXS E1 XPLR / or Eagle groupset (matches cassette selection)
- Bossi Nomad carbon wheelset
- Cockpit selection chosen in the bike builder
- Prologo Nago saddle
- Pirelli Cinturato M Gravel tyres
- Bossi black bartape
- Tubeless
GRX Di2
- Bossi Grit SS frameset
- Shimano GRX Di2 825 2x / 827 1x groupset (matched to gearing selection above)
- Bossi Nomad carbon wheelset
- Cockpit selection chosen in the bike builder
- Prologo Nago saddle
- Pirelli Cinturato M Gravel tyres
- Bossi black bartape
- Tubeless
FORCE AXS E1
- Bossi Grit SS frameset
- SRAM Force AXS E1 XPLR/ Eagle groupset (matches cassette selection)
- Bossi Nomad carbon wheelset
- Cockpit selection chosen in the bike builder
- Prologo Nago saddle
- Pirelli Cinturato M Gravel tyres
- Bossi black bartape
- Tubeless
RED AXS E1
- Bossi Grit SS frameset
- SRAM RED AXS E1 XPLR / Eagle groupset (matches cassette selection)
- Bossi Nomad carbon wheelset
- Cockpit selection chosen in the bike builder
- Prologo Nago saddle
- Pirelli Cinturato M Gravel tyres
- Bossi black bartape
- Tubeless

Build yours

Specifications

Features and TEch Specs

3D printed aero 6AL/4V head tube
Hydroformed 3AL/2.5V aero down tube
Hydroformed 3AL/2.5V top tube with bag mounts
Ovalised and tapered 3AL/2.5V chainstays
Tapered 3AL/2.5V seatstays with rack mounts
3D Printed 6AL/4V size specific dropouts
3D printed 6AL/4V chain stay yoke
CNC 6AL/4V 86mm T47 bottom bracket
Fully integrated cable routing
3x bidon mounts
Triple fork rack mounts
12mm thru axle (12x100mm front, 12x142mm rear)

Flat mount disc brake
SRAM UDH (supplied with direct mount hanger option)
27.2mm seat post
Seatstay bridge
Chainstay bridge
Full fender mounts
Chain holder on seatstay
CNC headtube logo
Laser engraved downtube logos
Brush finish
700x50c tyre clearance, 27.5” x 2.2”
Electronic groupsets only

Size guide

Bossi frames are offered in sizes 50, 52, 54, 56, 58 and 60. The right size for you will depend on more than height alone, including your proportions, flexibility, riding style and fit preferences.

As a general guide:

50 suits smaller riders, typically around 160–168 cm

52 suits riders around 168–173 cm

54 suits riders around 173–178 cm

56 suits riders around 178–183 cm

58 suits riders around 183–188 cm

60 suits taller riders, typically around 188–196 cm

These height ranges are approximate only. Some riders may fall between sizes depending on leg length, torso length, arm length, mobility and desired riding position.

If you are between sizes, the best option will depend on how you want the bike to fit and feel. A smaller size may offer a slightly more compact and responsive fit, while a larger size may provide a little more reach and stack.

If you are unsure which size is right for you, we recommend getting in touch before ordering. We are happy to review your current bike fit, body dimensions and intended use to help guide you into the right size.

Frequently asked questions

How do I choose the right size?

Use the size guide on this page as a starting point. The right size will also depend on your proportions, flexibility, riding style and fit preferences. If you are unsure, get in touch and we can help guide you based on your measurements and current bike.

If you've had a professional bike fit before, email us your report and we will guide you through component selection

Can I order the frameset on its own?

Yes. Bossi framesets can be purchased on their own, or as a complete bike as one of our Core Builds.

We employ industry standards in our frame designs ensuring wide compatibility with components and ease of assembly by any qualified mechanic.

What is included with the frameset?

Each frameset includes the frame, carbon fork, carbon seatpost, headset, expansion plug, alloy spacers, thru-axles and seatpost clamp.

What is the difference between a Core Build and Custom Project?

Core Builds are complete bikes with carefully considered specifications chosen to suit the intended character of the model.

Custom Projects offers a greater level of customisation for riders who want to curate their build in more detail, include non-standard finishes,

Are Bossi bikes built to order?

Yes. All complete bicycles are built to order here in Australia. Once your order is placed, we confirm sizing, specification and component availability before the build begins. Our current lead time on complete bikes is roughly 2-4 weeks.

How long will my order take?

Lead times vary depending on frame availability, selected components and current workshop scheduling. Framesets are typically instock and fulfilled within 48 hours, while complete bicycles require additional time for assembly, setup and final quality control. We will confirm the expected timeline after purchase. On average, complete bicycles are fulfilled within 2-4 weeks.

Can I customise the specification of a Core Build?

For Core build orders, you can select your preffered gearing, crank length, and cockpit size. For further customisation, please contact us and we can discuss the requirement of your custom project and quote accordingly.

Do you ship internationally?

Yes, we ship internationally. For more information on shipping rates, delivery timeframes, duties and taxes, please visit our Shipping page or get in touch before ordering.

SHIPPING

Can you help me choose the right build?

Yes. If you are deciding between frameset, Core Build or a more custom configuration, we are happy to help guide you based on your riding, fit requirements and budget. Contact us and we'll arrange a consultation.

Testimonials

I purchased a Grit and couldn't be happier with both the bike and the service.
From the moment I walked into Bossi Bicycles, I was met with exceptional care and expertise. James and Peter truly listen, providing a customer-centric approach that is both considered and attentive.The Grit is awesome to ride. Whether I'm riding on the road, tackling gravel trails, or embarking on long day rides and multi-day bike packing trips, it handles superbly. I have now ridden over 17,000 kilometers, and the bike has performed flawlessly throughout.
I highly recommend Bossi Bicycles for anyone in search of a high-quality bike and outstanding service. Their dedication to customer satisfaction and their passion for cycling shine through in every interaction.
Mike RSydney, NSW
Bought the Grit 4 years ago and I’m currently riding it multiple times a week. Must say it is an awesome bike. It feels great on gravel and very trustful at any speed. I’ve totally abandoned my other bike since owning this one.
Also, James and Peter did a great job of shipping it to Germany after I left Australia. Great service all in all.
MCochGER
Thoroughly satisfied with my first venture into the world of Bossi Titanium.
I’ve been enjoying my Grit for around six weeks now, with around 1,000km up so far. Its performance on the loose stuff is next level, with amazing agility, responsiveness and comfort, on top of that it has replaced my old roadie as a more than capable day to day commuter.
It’s not only the bike that excels, the team at Bossi is exceptional and adds a level of professionalism that other LBSs can’t match. When you’re ready for the next step up, I recommend taking a look at a Bossi.
John MSydney, AUS