• Home
  • About Sinnett-Bicycles
  • Our Building Process
  • Nuclear Option
  • Black Shuck
  • Story of The Black Shuck
  • Full Custom Frames
  • Paintwork and Protection
  • Renovations
  • Custom Kit & Casual Wear
  • Prices
  • Workshop and Reviews Blog
  • Warranty
  • FAQ
  • Useful Links
  • More
    • Home
    • About Sinnett-Bicycles
    • Our Building Process
    • Nuclear Option
    • Black Shuck
    • Story of The Black Shuck
    • Full Custom Frames
    • Paintwork and Protection
    • Renovations
    • Custom Kit & Casual Wear
    • Prices
    • Workshop and Reviews Blog
    • Warranty
    • FAQ
    • Useful Links
  • Home
  • About Sinnett-Bicycles
  • Our Building Process
  • Nuclear Option
  • Black Shuck
  • Story of The Black Shuck
  • Full Custom Frames
  • Paintwork and Protection
  • Renovations
  • Custom Kit & Casual Wear
  • Prices
  • Workshop and Reviews Blog
  • Warranty
  • FAQ
  • Useful Links

Nuclear Option

    The Eloquent 'Monster' Gravel Bike

    Nuclear Option; the most drastic or extreme response possible to a particular situation.

    This particular situation is that we want big tyres for comfort, traction and puncture resistance, but we also want mud clearance, with a sharp handing, nimble, fast accelerating, climb capable geometry. Which leaves 2 options, underslung or elevated chain stays. [Personal Opinion] Underslung chain stays ain't that pretty!

    1990's tech for the 2020's and beyond

    In the early 1990's elevated chain stays were all the rage in the mtb world. Bikes were designed this way for good reason:-

    - Chainsuck (where the chain gets wedged between the chain stay and chain rings was common, due to group sets still evolving from the road).

    - Climbing was a big part of mtb'ing (downhill was in its infancy, the bikes were 'all-terrain bikes', literally mtb's were about conquering mountains).

    - Tyre/mud clearance (much like in modern gravel, mtb'ers wanted bigger, higher volume tyres. But also needed mud clearance, especially in UK conditions).


    The 'Nuclear Option' takes the learning from the past and utilizes it to produce a super fun 'monster' gravel bike.

    Positive Reactivity System

    Elevated chain stays enable a shorter wheelbase, delivering sharp handling, instant acceleration and nimble handling. Made from 25.4mm Reynolds 531, these stays are custom order from Reynolds. The dropouts and 142 x 12mm thru-axle, precision made by Bear Frame Supplies. They also feature replaceable mech hangers.


    Disc mounts are IS flat mount, enabling the latest calipers to be used and with adapters, any disc rotor size (160mm shown).

    Active Drains System

    Many of the 1990's elevated chain stay designed suffered failures in the BB area. Some claim was due to flex in that area, or poor materials. Both claims have merit, but the root cause was something far more sinister, drainage. 


    All steel frames need to breath as condensation will form inside the tubes and moisture will in evidently penetrate via riding and cleaning.  The Nuclear Options tackles the stiffness and quality issues but utilising  a 42mm downtube and oversize seat tube of superior Columbus Zona quality. It also prevents water ingress with its integrated headset and capped stainless bosses, whilst condensation is tackled by allowing the frame to breath as it should with internal ventilation and ultimately a drain.

    Graphite Moderator System

    Carbon forks are light, responsive and relatively cost effective. The Nuclear Option utilises  them for those very reasons. Featuring 12 x 100mm thru-axle and IS flat mount caliper mounts, these are ready for the best modern brakes available. They also feature rack and mudguard mounts. (custom fork options also available)

    Handpainted

    Inspired by the bikes of the 90's, hand painted finishes are as standard. But your paint options are limitless, please contact for prices.

    Copyright © 2026 Sinnett-Bicycles - All Rights Reserved.

    Powered by

    This website uses cookies.

    We use cookies to analyze website traffic and optimize your website experience. By accepting our use of cookies, your data will be aggregated with all other user data.

    DeclineAccept