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Ridley Dean Fast Disc vs Trek Speed Concept TT
Pick up to 4 bikes. Rows line up component by component. Highlighted rows differ, and green marks the best value where lower or higher is clearly better.
Key differences
- The Ridley Dean Fast Disc starts €1,800 cheaper (€4,999 vs €6,799 for the Trek Speed Concept TT).
- Tire clearance: up to 32 mm on the Ridley Dean Fast Disc vs 25 mm on the Trek Speed Concept TT.
Ridley Dean Fast Disc
Trek Speed Concept TT
| RidleyDean Fast Disc | TrekSpeed Concept TT | |
|---|---|---|
| Overview | ||
| Brand | Ridley | Trek |
| Build | Dean Fast Disc frameset | Speed Concept TT Frameset |
| Build notes | Ridley sells the Dean Fast as a frameset only (frame, fork, Forza TTT basebar and Forza Aero seatpost); colours are chosen in Ridley's configurator. | GBP price from trekbikes.com/gb and EUR price from trekbikes.com/de. Trek says the size-specific seatpost and cockpit parts are sold separately with Speed Concept framesets. |
| Price (MSRP) | €4,999€4,999£4,499 | €6,799$5,500£6,200 |
| Model year | 2024 | 2026 |
| Generation | Dean Fast (disc, 2023) | 3rd generation (Speed Concept 3.0) |
| Launched | 2023-08 | — |
| Discipline | Time trial | Time trial |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Aero | 86 | 82 |
| Frame | 84 | 86 |
| Hydration & storage | 45 | 42 |
| Fit | 48 | 66 |
| Practicality | 62 | 60 |
| Frame & fork | ||
| Frame material | Carbon (Ridley Elite Series, Toray 60T/50T/30T/24T mix) | 800 Series OCLV Carbon |
| Fork material | Carbon (Noah Fast Disc fork, 60T-40T-30T HM UD, in-mould F-Surface) | Carbon (Speed Concept full foil, integrated brake and stem) |
| 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 | — |
| Max system weight | — | 125 kg275.6 lb |
| Frame sizes | S, M, L | S, M, L |
| Colours | — | Deep Smoke/Gloss Trek Black |
| Also available as | — | Speed Concept SLR triathlon frame (storage, IsoSpeed, 78-degree seat angle, sizes S to XL) |
| 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) | UCI-approved as 'MY22 Speed Concept TT' (frame and fork code TREK-061), approved 28.01.2021, sizes S to L (3). The list also has a separate 'Speed Concept TT' entry (TREK-070) approved 12.05.2023 for size 58 only (UCI list version 2026.10.02) |
| Compatibility & standards | ||
| Brake type | Hydraulic disc (flat mount) | Hydraulic disc |
| Max rotor size | — | 160 mm |
| Wheel size | 700c | 700c |
| Max tire width | 32 mm | 25 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 | 58T |
| 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 | 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 | Integrated Speed Concept cockpit; size-specific cockpit parts are sold separately with the frameset |
| Seatpost type | Forza Aero seatpost (350 mm) | — |
| Effective seat angle range | — | 76° (nominal) |
| 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 | KVF (Kammtail Virtual Foil) |
| 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 | Integrated fork/stem, cockpit parts and seatpost (size-specific, sold separately) |
| Frame warranty | Lifetime warranty after registration (Ridley) | — |
| Sold via | Ridley dealers and online ordering with pick-up at a dealer | Trek retailers and trekbikes.com |
| Cockpit | ||
| Basebar | Ridley Forza TTT integrated basebar | — |
| Basebar width | 400 mm | — |
| Weight | 341 g12 oz | — |
| Notes | Integrated 110 mm stem | — |
| Saddle & seatpost | ||
| Seatpost | Ridley Forza Aero | — |
| Notes | 350 mm length | — |
| Geometry (smallest – largest size) | ||
| Sizes | S, M, L | S, M, L |
| Rider height min | — | 154–175 cm5′1″–5′9″ |
| Rider height max | — | 167–186 cm5′6″–6′1″ |
| Stack | 495–518 mm19.5–20.4″ | 484–533 mm19.1–21″ |
| Reach | 373–411 mm14.7–16.2″ | 398–434 mm15.7–17.1″ |
| Seat angle min | 74.5° | 76° |
| Seat angle max | 74.5° | 76° |
| Head tube angle | 71.5–72° | 72° |
| Head tube length | 90–110 mm3.5–4.3″ | 65–115 mm2.6–4.5″ |
| Effective top tube | 510–555 mm20.1–21.9″ | 518–566 mm20.4–22.3″ |
| Seat tube length | 500–540 mm19.7–21.3″ | 499–549 mm19.6–21.6″ |
| Chainstay | 405 mm15.9″ | 410 mm16.1″ |
| Wheelbase | 964–1,001 mm38–39.4″ | 982–1,034 mm38.7–40.7″ |
| BB drop | 75 mm3″ | 72 mm2.8″ |
| Fork offset | — | 45 mm1.8″ |
| Trail | — | 63 mm2.5″ |
| Standover | 763–786 mm30–30.9″ | 751–800 mm29.6–31.5″ |
| Saddle height min | — | 559–604 mm22–23.8″ |
| Saddle height max | — | 756–805 mm29.8–31.7″ |
| Wheel size | 700c | 700c |
| Stem length | 110 mm4.3″ | — |
| Basebar width | 400 mm15.7″ | — |
Geometry overlay
Pick a size for each bike to see frames and arm-pad ranges on top of each other.
Drawn to scale (how to read it).