Finance available with Novuna Personal Finance
DM.M.373A.3.1
The Argon 18 Dark Matter - Shimano GRX - Anthracite M Anthracite is available at the following locations.
The item will be transferred to the location you choose during checkout.
If the item is not currently available to view at your desired location, please call your nearest store to arrange for it to be transferred.
Redefine your boundaries with the Argon 18 Dark Matter Shimano GRX. Engineered for riders who refuse to turn back when the pavement ends, this carbon gravel machine blends Argon 18’s legendary racing DNA with rugged, adventure-ready versatility. Whether you’re lining up for a competitive gravel race or embarking on a multi-day bikepacking expedition, the Dark Matter delivers the stability, speed, and comfort you need to conquer any surface.
The 2026 Dark Matter is built around a lightweight, mid-modulus carbon frame optimized for Topological Compliance System (TCS). This proprietary technology ensures the frame soaks up road vibrations and trail chatter while maintaining the lateral stiffness required for explosive power transfer. With an aggressive yet stable geometry, including a longer wheelbase and a refined fork rake, you’ll enjoy "hallmark precision handling" even on the most technical descents.
Every bike purchased from On It Sports is built in-store by our experienced team and undergoes a full pre-delivery inspection (PDI) before being carefully prepared for shipping.
We take pride in ensuring each bike leaves our workshop properly assembled, checked, and ready for final setup, helping you enjoy a smooth and confident first ride.
Some final assembly will be required on delivery, but we aim to keep this to a minimum wherever possible.
*Bikes purchased through Cycle to Work schemes are excluded from free shipping.
A standard bike delivery charge of £45 applies.
If you choose to collect your bike from our store, you’ll receive a free basic bike fit as part of your collection.
This includes:
Once your bike is ready, we’ll contact you by email to arrange a convenient collection and bike fit appointment.
If you’re not completely satisfied with your purchase, please let us know. We offer a 30-day return or exchange period on items purchased with a valid receipt.
To be eligible for a return or exchange:
Returns requested after 30 days cannot be accepted.
We accept Cycle to Work vouchers on most full-price bikes through a wide range of approved schemes. Simply choose your bike, proceed through checkout, and select your Cycle to Work scheme at the payment stage.
Our checkout will guide you through the process, including any additional information required by your chosen scheme.
Your Cycle to Work voucher can be used on:
This allows you to maximise your voucher and get everything you need in one purchase.
When you reach payment:
Our team will then process your order and contact you if anything further is required.
* Sale bikes purchased using a Cycle to Work voucher may be subject to a surcharge.
This reflects the commission charged by Cycle to Work scheme providers.
If you’re considering using a Cycle to Work voucher on a discounted bike and want to confirm pricing before ordering, please contact us and we’ll be happy to help.
At ONIT Sports, we aren't just a retailer; we’re a hub for the South Wales cycling and triathlon community. As a leading independent cycle specialist in South Wales, we know that the right bike isn't just about the specs - it’s about how it feels on the road, the trail, or in a TT. Whether you’re visiting us in-store or browsing online, you’re getting advice from people who live and breathe life on two wheels.
Every bike that leaves our hands is professionally assembled and safety-checked by our fully trained technicians. We don’t just "box" bikes; we prepare them so that they arrive at your door, set-up and ready for the first mile.
We offer fast, secure UK shipping on all bikes. For that extra touch of care, we also provide a FREE bike fit on bikes collected in store - ensuring your new pride and joy is setup for you, ready for your first ride.
We believe top-tier performance should be accessible. We offer a range of flexible finance solutions through Novuna Personal Finance, as well as PayPal options, allowing you to spread the cost with a plan that suits your budget
Looking to save on your next ride? We proudly accept a wide range of Cycle Scheme vouchers, helping you make the most of tax-free cycling benefits with zero hassle.
Start your cycling journey with On It Sports, and hit the road with the total confidence that only expert-level support can provide.
| Colours | Anthracite |
| Sizes | M |
| Brand | Argon 18 |
| Model Year | 2025 |
| SKUs / Part Numbers | DM.M.373A.3.1 |
with a £ 0.00 deposit.
The total charge for credit is £ 0.00.
Please note the above quotation is an indicative cost and actual monthly payments may vary by +/- 2p per month.
Credit subject to status and affordability. Terms & Conditions Apply. ONIT Sports is a credit broker and is Authorised and Regulated by the Financial Conduct Authority. Credit is provided by Novuna Personal Finance, a trading style of Mitsubishi HC Capital UK PLC, authorised and regulated by the Financial Conduct Authority. Financial Services Register no. 704348. The register can be accessed through http://www.fca.org.uk.
24 Month Representative Example:
Purchase Price (incl. VAT) £750
Deposit £75
Loan Amount £675
Interest/Total Charge for Credit £109.32
Total Amount Repayable £859.32
Balance Payable £784.32
By 24 Monthly Repayments of £32.68
15.9% APR Representative
Bank rate of interest 8.1% PA fixed
Please note the above quotation is an indicative cost and actual monthly payments may vary.
For Buy Now Pay Later and Deferred Interest Bearing Credit: Interest is charged from day 1 of your agreement, but not charged on any repayments made during the deferral period. On expiry of the deferral period, interest accrued during the deferral period will be applied to your repayments.
Consumer credit services are only available to over 18s and subject to status.
This is for estimation purposes only. Actual Finance Application is Completed During Checkout.
