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    Flat Harry's Cyclery
    31 High Street, Cookham, Maidenhead, SL6 9SJ. View the map
  • Who are we?

    A bit about us

    Flat Harry's mission is to be the best local bike shop in the Thames Valley area, our customer base is broad, attracting cyclists from all the towns and villages around Cookham; in a radius around us that passes through Lane End, High Wycombe and Beaconsfield, onto the Chalfonts, Gerrards Cross, Uxbridge, Windsor and Eton, through Taplow, Maidenhead, Bray and Holyport, and over to Marlow and Henley, our customers are happy to travel to find us, knowing we cater for every and any cyclist. We're mad about cycling and love it when anyone shares our enthusiasm, be they an aspiring fan of the sport, a tech hungry hard rider spinning their best speed machine, a thrill hungry mud lover, a hardened commuter battling the traffic, or a leisurely rider on a modest budget looking to have fun and relax on their bike.

    Whether it's serving coffee and flapjack on the mid-ride break, fixing your tusty steed, performing a bike-fitting or providing you with the right gear for your ride, we do it all and a lot more at Flat Harry's. We are proudly independent and thus only stock parts and brands that we are passionately proud of, and believe are the most suited for cyclists coping with the flint strewn roads and trails in our area.

    Our obsessive temperament, collective knowledge, engineering expertise, focus on quality and debunking of fads are what distinguish our shop, and make our customers return time and time again. Building trusting long term relationships with our customers is really important to us. Simply put, we want to be the place you trust above all others to do the right thing for you. Some folk might try and take advantage of our good nature, but we believe what goes around comes around and we want you to value our approach.

    Read more about us...
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  • Key Information!

  • Argon18 Dark Matter Frameset

    Argon18 have created a sumptious beast in the form of their Dark Matter Gravel bike.  this is their most engineered frameset to date. 

    £1,699.99

    Customer Rewards

    Buy now, get an extra £51.00 off your next purchase with Customer Rewards

    Argon18 Dark Matter Frameset Video

    Pre-Order

    With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

    You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!

    Pre-Launch

    With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

    So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

    Estimated Delivery Dates

    Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

    The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

    The Current Estimated Delivery Dates for Argon18 Dark Matter Frameset is

    Argon18 Dark Matter Frameset Description

  • Brand : Argon 18
  • Season :
  • Code : A18FS19DMBRNGLS
  • Weight : 0KG
  • Highly capable of being ridden at speed offroad, with enough vertical compliance delivered through finely engineered and profiled carbon tubes, exquisite details such as modular cable ports provide wide compatability with both mechanical or wired and wireless cable options, resulting in a bike built without unsightly cable ports it your groupset doesn't need them.  it's a delight to setup.

    The frameset comes with seatpost, bolt through axles, and various build kit options for different length head tubes, as well as cable entry and exit plates to enable integration of Di2 hidden junction box, or SRAM Wireless eTap or Mechanical cables. as well as parts to enable front Mech to be fitted or left single ring.

    Cris has built his one with SRAM Force X1 - although it can be nicely built with any groupset, from Shimano, SRAM or Campagnolo.  

    We can supply frameset only, or build it into a bike of your choice.  as an indication we have built these with Shimano GRX for approx £3950, and with SRAM Force for £4950.  prices depend on wheels and finishing kit, so come talk to us about what you'd like yours to do, and we can help specifiy and price up your ideal gravel bike based on these superbe framesets

    Argon18 developed the Dark Matter frameset in conjucntion with their brand new Krypton Endurance Road frameset, both the Dark Matter and the Krypton share the same chassis, with the Dark Matter having a dropped chainstay on the drive side, as well as wider fork stance to enable up to 45mm wide tyres (or 40mm with mudguards fitted) 

    designed for flat mount brakes, using140mm or 160mm disk rotors.

    Buyers Guide

    Sizing Information

    Technical Information

    Click & Collect Buy the Argon18 Dark Matter Frameset online & from us and will build
    your bike so it's ready to ride. We'll let you know when your new bike is ready to collect!

    Add to Basket

    £51.00 reward points with this purchase
    • Large, Sand
    • £1,699.99
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    • Medium, Sand
    • £1,699.99
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    • Small, Sand
    • £1,699.99
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    • X-Large, Sand
    • £1,699.99
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    • X-Small, Sand
    • £1,699.99
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    • XX-Small, Sand
    • £1,699.99
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    Argon18 Dark Matter Frameset
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