Ride faster. Push further.
The UK-made titanium Signature Esker is built for speed, control, and performance-led gravel riding.
- Frame Material Reynolds 3AL 2.5V internally butted main triangle
- Frame Finish Satin bead-blast finish with brushed logos
- Headtube CNC machined 44mm
- Bottom Bracket Custom machined Ti T47 86.5mm
- Dropouts UDH, thru-axle
- Hanger Sram UDH
- Brake Mount 160 front / 160 rear flat mount
- Axle Size 12 x 142mm bolt thru
- Tyre Clearance Max. 700c x 50mm / 650b x 50mm
- Cable Routing Internal via custom entry ports or fully integrated cockpit option
- Front Derailleur 34.9mm band-on
- Max Chainring Size 1X 42t
- Seat Tube External 34.9mm
- Seat Post 31.6mm or 27.2mm with shim
- Headset In-Route ZS44 upper/EC44 lower (Chris King Aeroset 3)
Integral ZS44 upper/EC44 lower (Chris King inset 7/8)
We view all our riders as individuals and as such all our stock geometries are unisex in design – offering 11 finely tuned stock sizes from 50cm to 60cm, with the additional option of a full custom design and build (+£300).
Because every Esker frame is made to order in our Sussex workshop, we have complete control from start to finish. This allows us to control every step of production, and allows you to fine tune your Esker your way. From custom geometry through to bespoke finishes and more. So if a stock geometry frame doesn’t work for you, we’ll make you one that does, and with careful consideration on components we can further customise every build to ensure the fit is perfect.
We feel that having a frame that fits you perfectly is a critical part of the process. We have over 20 years of bike fitting experience and data to call upon to ensure your riding position is absolute pinpoint. You can make an appointment here for a fitting. No obligation.
Alternatively you can send us any fit data you have or if you have a bike that fits you perfectly, let us know and we can go from there.
Further information on our sizing and frame geometry can be found here.
Opting for an individually crafted frame presents the benefit of total customisation, tailored specifically to match your distinctive style and riding preferences. This flexibility enables the meticulous adjustment of each frame to cater to riders' specific needs, encompassing personalised frame geometry, customised cable routing, the addition of extra eyelets, and the option for unique frame finishes, including bespoke paint designs. Virtually anything is within the realm of possibility.
When considering complete bike purchases, the range of achievable specifications is extensive. If you have a specific vision for your upcoming bike build, just let us know, and we can turn your ideas into reality.
Step 1. Get in touch:
Call, email, or book a visit online by clicking here .
Alternatively, reach out to your local Enigma dealer, who will guide you through the process.
Step 2. Discussion:
To get started, please complete our
This form gathers essential details such as:
-Your personal information (name, address, contact details)
-Riding style
-Bike fit data (if known)
-Objectives and targets
If you don't yet have bike fit data, don’t worry—we can still move forward and gather that information later. Once we have this information, we’ll prepare a CAD drawing of your frame and start discussing your bike’s specifications, including geometry, finish, and components. We will also give you a price based on your preferences.
Step 3. Deposit:
If you're happy to proceed with your order, we will request a deposit of £2000 to confirm your place in the queue and move forward with the build process.
Step 4. Final Sign-Off:
We will send a final copy of your CAD drawing, a mock-up of your finished frame, and our Build Form for your approval. Once signed, your order will proceed directly to the workshop. At this stage, no changes or amendments can be made without incurring additional costs.
The next stage requires a bit of patience! We aim to have your frame completed within 60-90 days, depending on the level of customisation required for the geometry. If you're opting for a full bike build, we'll be busy during this time gathering and ordering all the necessary components. Once your frame is finalised, our mechanics will get to work on the assembly.
Throughout the process, you’ll receive updates from the workshop at key milestones to keep you informed on the progress. Please note that additional time may be needed for any custom paintwork.
When your Enigma is ready for handover, we’ll request payment of the remaining balance. We accept all major debit and credit cards and partner with leading Ride to Work schemes, as detailed below. Please note that some schemes may include a surcharge due to higher commission rates.
To streamline the process, we kindly ask you to confirm your preferred payment method when placing your order, including whether you plan to use a Ride to Work scheme. If you’re paying the full amount through a cycle scheme, your deposit will be refunded once we’ve received the funds from the voucher company.
The Inspiration
The Esker represents a focused approach to performance gravel bike design, created for riders who want speed, efficiency, and confident handling beyond the tarmac. Race-inspired at its core, it blends the precision and responsiveness of a road bike with the stability and control required for fast gravel riding and endurance events.
Crafted from Reynolds Grade 9 (3Al/2.5V) titanium tubing, the frame balances low weight, lateral stiffness, and long-distance comfort. The use of Reynolds tubing not only enhances ride performance but also reflects a considered approach to material efficiency and sustainability.
Each Esker frame is built to order, offering a fully custom titanium gravel platform for riders seeking a tailored fit and specification. Those looking for a complete, ready to ride performance gravel bike with the same intent may also consider the Edge, while the Esker remains the fully bespoke option within the range.
The Details
Every detail of the Esker is engineered to support high-performance gravel riding, combining race-ready intent with refined titanium engineering. Influenced by the road-focused Eikon, the Esker can be specified with an optional integrated cockpit, delivering a clean, modern aesthetic and fully internal cable routing for riders seeking a streamlined setup.
A T47 bottom bracket allows for concealed cable routing while increasing stiffness and bearing durability. Generous tyre clearance of up to 50mm enables fast, confidence-inspiring setups across a wide range of gravel conditions, from hardpack to rougher, high-speed terrain. UDH (Universal Derailleur Hanger) dropouts further improve drivetrain precision and long-term serviceability.
Handcrafted in England, the Esker is available with custom geometry, fittings, and dropper seatpost compatibility. Built for speed, control, and endurance, it is a race-focused gravel bike designed to perform consistently over long distances and demanding terrain.
Key Features:
Performance-Focused Capability
With tyre clearance of up to 50mm, the Esker supports fast, confidence-inspiring gravel setups across a wide range of conditions, from hardpack to rougher, high-speed terrain. UDH dropouts improve drivetrain precision, durability, and long-term compatibility, while dropper seatpost compatibility and optional custom fittings allow the bike to be configured for demanding endurance gravel events and technical courses.
Integrated Design & Precision Handling
Designed for seamless integration, the Esker features internal cable routing as standard, with an optional fully integrated cockpit for a clean, aerodynamic aesthetic. A custom-machined T47 bottom bracket maximises stiffness and power transfer, while the 44mm head tube delivers confident stability and precise steering, reinforcing the Esker’s focus on high-performance gravel riding..
Refined Titanium Construction
Built using internally butted Reynolds 3Al/2.5V titanium tubing, the Esker is engineered to deliver an exceptional strength-to-weight balance, combining low weight with the lateral stiffness required for responsive gravel handling. A carefully shaped rear triangle enhances compliance without dulling feedback, producing a ride that remains smooth, controlled, and engaging over long distances.
Each frame is finished using dual-pass micro-TIG welding, ensuring precise joint integrity, long-term durability, and the high level of craftsmanship expected from a UK-made Signature frame.
Reviews
EskerGeometry
| Frame Size (cm) | A - Effective Top Tube (mm) | B - Seat Tube (mm) | C - Head Tube (mm) | D - Chain Stay (mm) | E - BB Drop (mm) | F - Seat Angle° | G - Head Angle° | H - Fork Offset (mm) | I - Stack (mm) | J - Reach (mm) | K - Wheel Base (mm) | Down Tube OD | Top Tube OD |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 500 | 460 | 95 | 435 | 75 | 76 | 70.5 | 50 | 534 | 364 | 1008 | 42 | 32 |
| 51 | 510 | 475 | 105 | 435 | 75 | 75.5 | 70.5 | 50 | 544 | 366 | 1009 | 42 | 32 |
| 52 | 520 | 490 | 115 | 435 | 75 | 75 | 70.5 | 50 | 553 | 369 | 1020 | 42 | 32 |
| 53 | 530 | 505 | 125 | 435 | 75 | 74.5 | 71 | 50 | 564 | 371 | 1021 | 42 | 32 |
| 54 | 540 | 520 | 135 | 435 | 75 | 74 | 71 | 50 | 573 | 374 | 1027 | 42 | 32 |
| 55 | 550 | 535 | 145 | 435 | 75 | 74 | 71 | 50 | 583 | 381 | 1037 | 42 | 32 |
| 56 | 560 | 550 | 155 | 435 | 75 | 74 | 71.5 | 50 | 595 | 388 | 1043 | 42 | 32 |
| 57 | 570 | 565 | 165 | 435 | 75 | 73.5 | 71.5 | 50 | 604 | 390 | 1048 | 42 | 32 |
| 58 | 580 | 580 | 175 | 435 | 75 | 73 | 71.5 | 50 | 614 | 391 | 1053 | 42 | 32 |
| 59 | 590 | 595 | 185 | 435 | 75 | 73 | 72 | 50 | 625 | 398 | 1058 | 42 | 32 |
| 60 | 600 | 610 | 195 | 435 | 75 | 73 | 72 | 50 | 635 | 405 | 1068 | 42 | 32 |
The sizing chart below is designed as an approximation guide. If you need help determining the size frame you require, we always recommend a test ride and/or bike fit at either our showroom here in Sussex or at your nearest Enigma dealer, where possible. We have extensive experience fitting customers to our bikes and can confidently recommend the correct size for you
Sizing
| Frame Size (Horizontal Top Tube) | Rider Height (cm) | Rider Height (Inches) | Saddle Height (mm) |
|---|---|---|---|
| 50 | 158 | 5'2" | 660 |
| 51 | 162 | 5'4" | 680 |
| 52 | 166 | 5'5" | 700 |
| 53 | 170 | 5'7" | 720 |
| 54 | 174 | 5'8" | 740 |
| 55 | 178 | 5'10" | 760 |
| 56 | 182 | 6'0" | 780 |
| 57 | 186 | 6'1" | 800 |
| 58 | 190 | 6'3" | 820 |
| 59 | 194 | 6'4" | 840 |
| 60 | 198 | 6'6" | 860 |
Our team of expert fitters are always on hand to help you choose, so if in any doubt please get in touch.
Custom Builds
Check out some of our latest Esker builds below.
Reserve Yours

Esker
The Esker is Enigma’s UK-made titanium gravel frame designed for speed, durability, and versatility. Handcrafted from Reynolds Grade 9, now available with custom Cerakote finishes.
Build Deposit
Secure your place in our workshop frame-building schedule with a deposit.
*This deposit will be deducted from the total frame or bike price
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