DimondRadiant SL
Dimond's lightweight aero road frameset, made in small batches in Des Moines, Iowa. Dimond claims a 950 g painted frame (size 54) and a 200 g fork, with wind-tunnel-validated shapes, a T47 threaded bottom bracket, UDH and room for 32 mm tyres. It comes with a one-piece Red Crown Cycling Raven bar and stem in a choice of 20 width and length combinations, and is sold direct as a frameset or as a custom build.
- From
- $5,400$5,400$5,400
- Builds
- 1
- Sizes
- —
- Frame weight
- 950 g33.5 oz
Design sketch, generated from the manufacturer's photo
Our verdict
No overall score: there's no complete-bike price to rate
A small-batch, US-made aero road frameset for riders who want a light frame and a made-to-order cockpit: 950 g painted, a one-piece bar and stem in 20 sizes, T47 and UDH. Dimond publishes no aero figures or SL geometry yet, and it is sold direct as a frameset or custom build.
Scored Oct 2026
- + Premium frame
- + Wide 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
- 78/100
- Frame
- 86/100
- Fit
- 80/100
- Practicality
- 74/100
Aero claims and front-end integration
Carbon grade, weight and warranty
Sizes and adjustment range
Travel, standard parts, servicing
Bike duel
Frame & platform
Frame & fork
- Frame material
- Carbon
- Frame weight
- 950 g33.5 oz
- Fork weight
- 200 g7.1 oz
- Weight measured on
- Frame size 54, painted (Dimond); fork weight as listed
- Frame sizes
- 46, 49, 52, 54, 56, 58
- Colours
- Standard and custom finishes
Compatibility & standards
- Brake type
- Disc
- Max tire width
- 32 mm
- Bottom bracket standard
- T47 threaded
- Cable routing
- Fully internal through the Raven bar and stem and integrated headset
Fit & adjustability
- Cockpit
- One-piece carbon bar and stem (Red Crown Cycling Raven), can be painted to match the frame
- Fit notes
- The Raven bar and stem is chosen at order in 380, 400, 420 or 440 mm widths with 80, 90, 100, 110 or 120 mm stems (the product page text lists 90 to 120 mm). 35 mm of spacers in 5 mm steps raise the bar above the head tube.
Aerodynamics
- Manufacturer aero claims
- Dimond says the tube shapes are wind-tunnel validated and developed with CFD; it publishes no drag figures
Travel, maintenance & warranty
- Derailleur hanger
- UDH (SRAM Universal Derailleur Hanger), SRAM Transmission compatible
- Frame warranty
- Frameset covered against manufacturing defects for 6 years from purchase, original owner only (not transferable); hardware, paint, graphics and Dimond forks for 1 year
- Sold via
- Direct from Dimond
Photos
Design sketches
Builds & components
Highlighted rows differ between builds. Green marks the best value.
Radiant SL frameset | |
|---|---|
| Overview | |
| Price (MSRP) | $5,400$5,400$5,400 |
| Type | Frameset |
| Notes | Frame, fork, Raven one-piece bar and stem and seatpost. Dimond also offers custom complete builds starting at $8,499 with SRAM AXS or Shimano Di2, but lists no fixed build specs for the SL. |
| Cockpit | |
| Handlebar | Red Crown Cycling Raven |
| Type | One-piece bar and stem |
| Integrated stem | Yes |
| Widths available | 380, 400, 420 or 440 mm, with 80 to 120 mm stem (buyer's choice when ordering) |
| Cable routing | Fully internal, with integrated headset and spacer system |
| Material | Carbon |
| Weight | 375 g13.2 oz |
Radiant SL price & value
Building up the Radiant SL frameset
Included: Handlebar.
Still to buy: Groupset, Crankset, Cassette, Chain, Brake calipers, Wheelset, Tires, Seatpost, Saddle, Pedals.
Ownership checklist
2 of 2 known checks pass, 2 not published by Dimond. Why these checks
- ✓
Threaded bottom bracket
T47 threaded
- ✓
UDH derailleur hanger
UDH (SRAM Universal Derailleur Hanger), SRAM Transmission compatible
- ?
Standard 12×142 mm rear axle
- ?
Works with mechanical shifting
Good to know
Compatibility
Dimond rates the frame for 32 mm tyres and says some rim and tyre combinations up to 34 mm fit.
SourceVersions
The 'Additional information' block on the Radiant SL page still shows older figures (1.27 kg frame weight, sizes 50 to 58 cm, Ultegra Di2 2x11 and 105 2x11 builds), and the linked geometry chart is the original Radiant's from 2021. Those are left out here; the SL's own key-features table is used.
Source
Radiant SL FAQ
How much does the Dimond Radiant SL cost?+
Manufacturer prices (MSRP): $5,400 across 1 listed build: Radiant SL frameset.
How much does the Dimond Radiant SL weigh?+
The frame weighs 950 g (33.5 oz) (Frame size 54, painted (Dimond); fork weight as listed).
What is the tire clearance of the Dimond Radiant SL?+
Up to 32 mm tires.
Which groupsets are compatible with the Dimond Radiant SL?+
Bottom bracket: T47 threaded.
What warranty does the Dimond Radiant SL frame have?+
Frameset covered against manufacturing defects for 6 years from purchase, original owner only (not transferable); hardware, paint, graphics and Dimond forks for 1 year
Is the Dimond Radiant SL aerodynamic?+
Dimond says the tube shapes are wind-tunnel validated and developed with CFD; it publishes no drag figures
Sources
- https://www.dimondbikes.com/products/radiant-sl
- https://www.dimondbikes.com/pages/warranty-and-returns
Dimond Radiant SL data last updated · How the data is checked ·