AeroAddicts

RidleyDean Fast Disc

Time trial2024Dean Fast (disc, 2023) ↗Disc brakesUCI legal

Ridley's UCI-focused time trial frame, unveiled at the 2023 Glasgow World Championships. It was shaped with CFD around 55 km/h and checked in the Bike Valley wind tunnel, and it uses the looser 8:1 tube-ratio rule and compensation triangles to stretch the tube profiles. The frame is electronic-only, has a UDH rear hanger and a removable front-derailleur hanger for clean 1x builds, clears 32 mm tyres and is sold as a frameset with an integrated basebar.

Ridley Dean Fast Disc, drive side
© Belgian Cycling Factory NV
From
€4,999€4,999£4,499
Builds
1
Sizes
3
Frame weight
1,250 g2.76 lb

Design sketch, generated from the manufacturer's photo

Our verdict

No overall score: there's no complete-bike price to rate

A UCI-focused frameset for time triallists who want long-tube aero shaping, a light frame and a lifetime warranty for less than most rival framesets. Only three sizes, a fixed 74.5° seat angle and nothing beyond two bottle positions make it a weak choice for long-course triathlon, where Ridley's Triton Fast fits better.

Scored Oct 2026

  • + Aero-first design
  • + Premium frame
  • − Limited fit adjustment

AI-drafted from the specs on this page and reviewed before publishing. Scores are relative to every bike in the catalog when they were given, so they drop as newer bikes and parts raise the bar.

Aero
86/100

Aero claims and front-end integration

Frame
84/100

Carbon grade, weight and warranty

Hydration & storage
45/100

Not counted in the overall score for time-trial bikes: UCI rules limit integrated hydration and storage. Hydration and storage in the frame

Fit
48/100

Sizes and adjustment range

Practicality
62/100

Travel, standard parts, servicing

How each category is scored

Bike duel

Frame & platform

What each race allows

Frame & fork

Frame material
Carbon (Ridley Elite Series, Toray 60T/50T/30T/24T mix)
Fork material
Carbon (Noah Fast Disc fork, 60T-40T-30T HM UD, in-mould F-Surface)
Frame weight
1,250 g2.76 lb
Fork weight
460 g16.2 oz
Weight measured on
Size M, Ridley claim reported by BikeRadar; basebar 341 g
Frame sizes
S, M, L
UCI frame approval
UCI-approved as 'Dean Fast Disc' (frame and fork code RIDLEY-DEAN), approved 01.05.2023; the list (version 2026.10.02) names only size M (1)

Compatibility & standards

Brake type
Hydraulic disc (flat mount)
Wheel size
700c
Max tire width
32 mm
Bottom bracket standard
PF30 (press-fit)
Front axle
12x100 thru-axle
Rear axle
12x142 thru-axle
Drivetrain compatibility
Electronic groupsets only; Universal Derailleur Hanger (UDH)
Mechanical shifting possible
No
1x compatible
Yes
Max chainring
60T
Front derailleur mount
Removable bolt-on hanger with two clamp options (for 53-40T or 60-47T rings); a cover cap replaces it on 1x builds
Cable routing
Fully internal

Hydration & storage

Integrated hydration
No
Integrated storage
No
Bottle mount locations
Down tube, with two cage positions: a higher one for training access and a lower one for racing

Fit & adjustability

Aerobar system
Forza TTT integrated basebar (110 mm stem, 400 mm c-c) supplied with the frameset; the stem drops into the head tube
Seatpost type
Forza Aero seatpost (350 mm)

Aerodynamics

Testing method
CFD simulations optimised for about 55 km/h, then validated in the Bike Valley wind tunnel
Tube profile
F-Tubing (truncated NACA profiles) with F-Surface Plus grooves on frame and fork; uses the UCI 8:1 tube ratio and compensation triangles

Travel, maintenance & warranty

Derailleur hanger
UDH (SRAM Universal Derailleur Hanger); the front derailleur hanger is removable and can be swapped for a cover on 1x builds
Proprietary parts
Forza TTT integrated basebar/stem, Forza Aero seatpost, removable front-derailleur hanger and cover
Frame warranty
Lifetime warranty after registration (Ridley)
Sold via
Ridley dealers and online ordering with pick-up at a dealer

Photos

Ridley Dean Fast Disc, drive side
© Belgian Cycling Factory NV
Ridley Dean Fast Disc frameset, drive side
© Belgian Cycling Factory NV

Design sketches

Design sketch of the Ridley Dean Fast Disc, side view
Side view · Design sketch, generated from the manufacturer's photo
Design sketch of the Ridley Dean Fast Disc, three-quarter view
Three-quarter view · Design sketch, generated from the manufacturer's photo
Design sketch of the Ridley Dean Fast Disc, front view
Front view · Design sketch, generated from the manufacturer's photo

Builds & components

Highlighted rows differ between builds. Green marks the best value.

Ridley Dean Fast Disc builds
Dean Fast Disc frameset
Overview
Price (MSRP)€4,999€4,999£4,499
TypeFrameset
NotesRidley sells the Dean Fast as a frameset only (frame, fork, Forza TTT basebar and Forza Aero seatpost); colours are chosen in Ridley's configurator.
Cockpit
BasebarRidley Forza TTT integrated basebar
Basebar width400 mm
Weight341 g12 oz
NotesIntegrated 110 mm stem
Saddle & seatpost
SeatpostRidley Forza Aero
Notes350 mm length

Dean Fast Disc price & value

Where it's cheapest

MSRPs converted at ECB reference rates of 2026-10-05 (1 EUR = 1.1204 USD = 0.8472 GBP). US prices exclude sales tax, so add your state's rate before comparing.

BuildMarketMSRPIn EURvs cheapest
Dean Fast Disc framesetEurope (EUR, incl. VAT)€4,999€4,999cheapest
UK (GBP, incl. VAT)£4,499€5,310+6%

Building up the Dean Fast Disc frameset

Included: Basebar, Seatpost.

Still to buy: Groupset, Crankset, Cassette, Chain, Brake calipers, Wheelset, Tires, Saddle, Pedals.

Ownership checklist

2 of 4 known checks pass, 3 not published by Ridley. Why these checks

  • ✕

    Threaded bottom bracket

    PF30 (press-fit)

  • ✓

    UDH derailleur hanger

    UDH (SRAM Universal Derailleur Hanger); the front derailleur hanger is removable and can be swapped for a cover on 1x builds

  • ✓

    Standard 12×142 mm rear axle

    12x142 thru-axle

  • ✕

    Works with mechanical shifting

  • ?

    Fits third-party aerobars

    Forza TTT integrated basebar (110 mm stem, 400 mm c-c) supplied with the frameset; the stem drops into the head tube

  • ?

    Rear disc wheel compatible

  • ?

    Fit kept when packed

Raced by

Pros who raced the Dean Fast Disc, with results on it.

  • Jelle Geens training in Girona on the Ridley Dean Fast
    © Ridley
    2024
    • 1st (3:32:09)Ironman 70.3 World Championship, Taupō 2024
    • 3rdIronman 70.3 European Championship, Tallinn 2024
    Source
  • Kenneth Vandendriessche racing the Ridley Dean Fast at Ironman Lanzarote
    © Ridley
    2024
    • 1st (8:29:54)Ironman Lanzarote 2024

    Setup: Lanzarote 2024: 181 km bike leg in 4:49:47 at an average of 270 W

    Source
  • 2024
    • 3rdWorld Triathlon Long Distance Championships, Townsville 2024
    Source
  • Alec Segaert racing the Ridley Dean Fast in the under-23 time trial at the 2023 UCI Road World Championships
    © Cs-wolves / CC BY-SA 4.0
    2023
    • 2ndUCI Road World Championships, U23 individual time trial 2023

    Setup: Glasgow Worlds 2023: Shimano Dura-Ace R9250 Di2 with Dura-Ace R9100 cranks, 4iiii power meter and a 60T Rotor outer ring, DT Swiss ARC 1100 Dicut 80 mm front and ARC 1100 disc rear, 25 mm Vittoria Corsa Speed tyres tubeless, Deda Jet One extensions

    Race setup, 6 parts →Source

Dean Fast Disc geometry

Ridley Dean Fast Disc geometry
SML
Stack495 mm19.5″499 mm19.6″518 mm20.4″
Reach373 mm14.7″394 mm15.5″411 mm16.2″
Seat angle min74.5°74.5°74.5°
Seat angle max74.5°74.5°74.5°
Head tube angle71.5°72°72°
Head tube length90 mm3.5″90 mm3.5″110 mm4.3″
Effective top tube510 mm20.1″532 mm20.9″555 mm21.9″
Seat tube length500 mm19.7″500 mm19.7″540 mm21.3″
Chainstay405 mm15.9″405 mm15.9″405 mm15.9″
Wheelbase964 mm38″977 mm38.5″1,001 mm39.4″
BB drop75 mm3″75 mm3″75 mm3″
Standover763 mm30″767 mm30.2″786 mm30.9″
Wheel size700c700c700c
Stem length110 mm4.3″110 mm4.3″110 mm4.3″
Basebar width400 mm15.7″400 mm15.7″400 mm15.7″

Side view & pad range

Your positionYour position (optional)

Drawn to scale (how to read it).

Ridley Dean Fast Disc · M

How the geometry rides

The Dean Fast Disc in size M against the middle size of 16 other bikes: tendencies from geometry, not a ride review (how to read this).

  • Wheelbase977 mm38.5″

    shortestlonger than 19% of 16 bikeslongest

    Short wheelbase: tends to feel more agile in corners and less planted on long straights.

  • Chainstay405 mm15.9″

    shortestlonger than 30% of 20 bikeslongest

Compare on the stack & reach chart

Good to know

  • Design

    Ridley designed the frame around the newer UCI rules: tubes can use an 8:1 length-to-width ratio instead of 3:1, and compensation triangles fill the junctions.

    Source

  • Design

    The stem sits down inside an hourglass-shaped head tube that extends further back than on the previous Dean, keeping the front end flush with the top tube.

    Source

  • Aerodynamics

    F-Surface Plus grooves on the frame and fork are meant to trip a small amount of turbulence so the main airflow stays attached to the tube shapes.

    Source

  • Integration

    There is no integrated hydration or storage. The down tube has two bottle positions: a higher one that is easier to reach in training and a lower, more aerodynamic one for racing.

    Source

  • Compatibility

    The bolt-on front-derailleur hanger comes off for 1x setups and is replaced by a cover. Ridley supplies clamps for 53-40T or 60-47T double chainrings.

    Source

  • Racing

    Kenneth Vandendriessche won Ironman Lanzarote 2024 on the Dean Fast, covering the 181 km bike course in 4:49:47 at an average of 270 W.

    Source

  • History

    Before launch, Alec Segaert rode the final prototype to silver in the U23 men's time trial at the 2022 World Championships.

    Source

  • History

    BikeRadar reported the frame's public launch on 8 August 2023, timed with the Glasgow World Championships time trials.

    Source

  • Versions

    Ridley later launched the Triton Fast, a dedicated triathlon bike with integrated hydration and storage, and now markets it alongside the UCI-focused Dean Fast.

    Source

Dean Fast Disc FAQ

Is the Ridley Dean Fast Disc UCI legal?+

Yes. The Ridley Dean Fast Disc is UCI legal, so it can be raced in draft-illegal triathlon as well as UCI time trials.

How much does the Ridley Dean Fast Disc cost?+

Manufacturer prices (MSRP): €4,999 / £4,499 across 1 listed build: Dean Fast Disc frameset.

How much does the Ridley Dean Fast Disc weigh?+

The frame weighs 1,250 g (2.76 lb) (Size M, Ridley claim reported by BikeRadar; basebar 341 g).

What sizes does the Ridley Dean Fast Disc come in?+

3 sizes: S, M and L.

What seat angle does the Ridley Dean Fast Disc have?+

74.5° effective seat tube angle.

Does the Ridley Dean Fast Disc have integrated hydration?+

The Ridley Dean Fast Disc has no integrated hydration system.

Does the Ridley Dean Fast Disc have integrated storage?+

No integrated frame storage.

What is the tire clearance of the Ridley Dean Fast Disc?+

Up to 32 mm tires on 700c wheels.

Which groupsets are compatible with the Ridley Dean Fast Disc?+

Drivetrain compatibility: Electronic groupsets only; Universal Derailleur Hanger (UDH). Mechanical groupsets are not supported. 1x drivetrains are supported. The largest chainring that fits is 60T. Bottom bracket: PF30 (press-fit).

Which pros ride the Ridley Dean Fast Disc?+

Jelle Geens, Kenneth Vandendriessche, Louis Naeyaert and Alec Segaert raced this generation of the Ridley Dean Fast Disc. See the "Raced by" section for seasons and results.

What warranty does the Ridley Dean Fast Disc frame have?+

Lifetime warranty after registration (Ridley)

Sources

Ridley Dean Fast Disc data last updated · How the data is checked ·