DimondTrilliant

Triathlon2026Disc brakesNot UCI legalDiscontinued

A lower-priced Dimond beam-frame triathlon bike built around disc brakes and 12 mm thru-axles. It has an integrated fork and the TOTES flat-kit compartment above the bottom bracket, but no Lunch Box bento. Dimond sells it as a complete bike with 11-speed Shimano 105 or Ultegra Di2 groups and a choice of colours, wheels and aerobars.

Last MSRP: $4,999$4,999$4,999
Builds: 3
Sizes: 4
Frame weight: 1,850 g4.08 lb

Design sketch, generated from the manufacturer's photo

Our verdict

Overall

out of 100, average of 7 categories

The cheapest way into a Dimond with disc brakes and an integrated fork, sold complete with a flat-kit box in the frame. The builds use dated 11-speed groups, TRP Spyre-C disc calipers and alloy wheels, there is no bento or hydration, and the seat angle is fixed.

Scored Oct 2026

+ Affordable way in

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: 64/100
Frame: 60/100
Components: 52/100
Hydration & storage: 55/100
Fit: 56/100
Practicality: 66/100
Price: 90/100

How each category is scored

Frame & platform

What each race allows

Frame & fork

Frame material: Carbon fibre
Fork material: Carbon (Dimond Disc Super Fork, integrated)
Frame weight: 1,850 g4.08 lb
Weight measured on: As listed by Dimond (size not stated)
Frame sizes: II, III, IV, V
Colours: Choice of frame colour and logo colour

Compatibility & standards

Brake type: Disc (TRP Spyre-C calipers in stock builds)
Wheel size: 700c
Bottom bracket standard: PF30 (46 mm diameter x 68 mm wide)
Front axle: 12 mm thru-axle
Rear axle: 12 mm thru-axle
1x compatible: Yes

Hydration & storage

Integrated storage: Yes
Storage details: TOTES (Tools Or Technical Equipment Storage) compartment above the bottom bracket for a tube, levers, CO2 and a small multitool; no top-tube bento.
Top tube bento box: No

Fit & adjustability

Third-party aerobars possible: Yes
Fit notes: Dimond links the Trilliant to the disc Marquise dimensions chart: fixed 79-degree seat angle, four sizes and a minimum saddle height per size.

Aerodynamics

Tube profile: Cantilevered beam frame with no seat tube

Travel, maintenance & warranty

Headset bearings: Cane Creek IS41 (IS41/28.6 upper, IS41/30 lower)
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 (custom builds via consultant or 3D configurator)

Photos

Design sketches

Design sketch of the Dimond Trilliant, side view — Side view · Design sketch, generated from the manufacturer's photo

Design sketch of the Dimond Trilliant, three-quarter view — Three-quarter view · Design sketch, generated from the manufacturer's photo

Design sketch of the Dimond Trilliant, front view — Front view · Design sketch, generated from the manufacturer's photo

Builds & components

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

Only show differences

Dimond Trilliant builds
	Trilliant Shimano 105 1x11	Trilliant Ultegra Di2 1x11	Trilliant Ultegra Di2 2x11
Overview
Price (MSRP)	$4,999$4,999$4,999	$6,499$6,499$6,499	$6,999$6,999$6,999
Type	Complete bike	Complete bike	Complete bike
Notes	Base price with Shimano WH-RS171 wheels and a Profile Design Ozero aluminium aerobar; Dimond lists upgrades for carbon wheels, aerobars, ceramic bearings and power meters.	Base price with Shimano WH-RS171 wheels and a Profile Design Ozero aluminium aerobar; Dimond lists upgrades for carbon wheels, aerobars, ceramic bearings and power meters.	Base price with Shimano WH-RS171 wheels and a Profile Design Ozero aluminium aerobar; Dimond lists upgrades for carbon wheels, aerobars, ceramic bearings and power meters.
Drivetrain
Groupset	Shimano 105	Shimano Ultegra Di2	Shimano Ultegra Di2
Speeds	11-speed	11-speed	11-speed
Electronic	No	Yes	Yes
Drivetrain	1x	1x	2x
Shifters	Microshift Bar-end, Shimano 11-speed	Shimano Ultegra Di2	Shimano Ultegra Di2
Crankset	Shimano / Wolf Tooth RS510 crankset with Wolf Tooth 50T chainring	Shimano / Wolf Tooth R7000 crankset with Wolf Tooth 50T chainring	Shimano Ultegra R8000
Chainrings	50	50	52/36
Bottom bracket	Praxis PF30-24	Wheels Manufacturing PF30	Wheels Manufacturing PF30
Standard	PF30	PF30	PF30
Front derailleur	—	—	Shimano Ultegra Di2
Rear derailleur	Shimano 105	Shimano Ultegra Di2	Shimano Ultegra Di2
Cassette	Shimano HG700	Shimano HG700	Shimano Ultegra R8000
Range	11-34	11-34	11-28
Speeds	11-speed	11-speed	11-speed
Chain	Shimano CN-HG601-11	Shimano CN-HG701-11	Shimano CN-HG701
Brakes
Brake levers	Profile Design 3/One	Shimano Ultegra Di2	Shimano Ultegra Di2
Brake calipers	TRP Spyre-C	TRP Spyre-C	TRP Spyre-C
Type	Disc	Disc	Disc
Rotors	Shimano SM-RT54	Shimano SM-RT54	Shimano SM-RT54
Front rotor	160 mm	160 mm	160 mm
Rear rotor	160 mm	160 mm	160 mm
Wheels & tires
Wheelset	Shimano WH-RS171	Shimano WH-RS171	Shimano WH-RS171
Tires	Continental Grand Sport	Continental Grand Sport	Continental Grand Sport
Cockpit
Aerobar system	Profile Design Ozero with 4525a Sonic Ergo extensions	Profile Design Ozero with 4525a Sonic Ergo extensions	Profile Design Ozero with 4525a Sonic Ergo extensions
Stem	Profile Design Seventeen	Profile Design Seventeen	Profile Design Seventeen
Headset	Cane Creek IS41	Cane Creek IS41	Cane Creek IS41
Saddle & seatpost
Saddle	Fizik Mistica	Fizik Mistica	Fizik Mistica
Seatpost	Dimond Dimond seatpost with Ritchey one-bolt clamp	Dimond Dimond seatpost with Ritchey one-bolt clamp	Dimond Dimond seatpost with Ritchey one-bolt clamp

Ownership checklist

1 of 3 known checks pass, 4 not published by Dimond. Why these checks

✕
Threaded bottom bracket
PF30 (46 mm diameter x 68 mm wide)
?
UDH derailleur hanger
✕
Standard 12×142 mm rear axle
12 mm thru-axle
?
Works with mechanical shifting
✓
Fits third-party aerobars
?
Rear disc wheel compatible
?
Fit kept when packed

Trilliant geometry

Dimond Trilliant geometry
	II	III	IV	V
Rider height min	152 cm5′0″	162 cm5′4″	175 cm5′9″	185 cm6′1″
Rider height max	162 cm5′4″	180 cm5′11″	190 cm6′3″	—
Stack	490 mm19.3″	515 mm20.3″	540 mm21.3″	585 mm23″
Reach	390 mm15.4″	405 mm15.9″	425 mm16.7″	440 mm17.3″
Seat angle min	79°	79°	79°	79°
Seat angle max	79°	79°	79°	79°
Head tube angle	72.5°	72.5°	72.5°	72.5°
Head tube length	75 mm3″	102 mm4″	128 mm5″	155 mm6.1″
Chainstay	400 mm15.7″	400 mm15.7″	400 mm15.7″	400 mm15.7″
BB drop	75 mm3″	75 mm3″	75 mm3″	75 mm3″
Front centre	570 mm22.4″	585 mm23″	615 mm24.2″	650 mm25.6″
Saddle height min	635 mm25″	675 mm26.6″	725 mm28.5″	785 mm30.9″
Wheel size	700c	700c	700c	700c

Side view & pad range

Dimond Trilliant

Your position (optional)Pad stackPad reach

Drawn to scale (how to read it).

Dimond Trilliant · III

How the geometry rides

The Trilliant in size III against the middle size of 29 other bikes: tendencies from geometry, not a ride review (how to read this).

Front centre585 mm23″
shortestlonger than 29% of 29 bikeslongest
Chainstay400 mm15.7″
shortestlonger than 25% of 53 bikeslongest
Short chainstays: a compact, responsive rear end.

Compare on the stack & reach chart

Good to know

Design
Dimond says the integrated fork improves aerodynamics and looks, and the single internal storage compartment keeps carry-along items out of the wind.
Source
Fit
The Trilliant product page links to the same dimensions chart as the disc Marquise.
Source
Compatibility
Stock builds use TRP Spyre-C disc calipers with 160 mm Shimano SM-RT54 rotors in every build, including the Ultegra Di2 versions.
Source
History
By November 2026 the Trilliant product page on Dimond's store no longer loads and the bike is gone from Dimond's triathlon-bike collection, which lists only the Mogul, Ikon and Marquise; the site menu still links the old page. Treated as no longer sold new; Dimond hasn't announced a replacement.
Source
Versions
Dimond lists build upgrades: Red Crown Cycling carbon 60/88 wheels (+$1,400), Profile Design Svet carbon (+$400) or Red Crown Monarch carbon (+$800) aerobars, SLF or Enduro ceramic bearings, and ROTOR InPower one-sided (+$600) or 2InPower two-sided (+$1,200) power meters.
Source

Trilliant FAQ

Is the Dimond Trilliant UCI legal?+

No. The Dimond Trilliant is not UCI legal. That is fine for non-drafting triathlon, but it cannot be used in UCI-sanctioned time trials.

How much does the Dimond Trilliant cost?+

Manufacturer prices (MSRP): $4,999–$6,999 across 3 listed builds and framesets: Trilliant Shimano 105 1x11, Trilliant Ultegra Di2 1x11 and Trilliant Ultegra Di2 2x11.

How much does the Dimond Trilliant weigh?+

The frame weighs 1,850 g (4.08 lb) (As listed by Dimond (size not stated)).

What sizes does the Dimond Trilliant come in?+

4 sizes: II, III, IV and V. The manufacturer recommends them for riders from 152 cm (5′0″) to 190 cm (6′3″).

What seat angle does the Dimond Trilliant have?+

79° effective seat tube angle.

Does the Dimond Trilliant have integrated storage?+

Yes. TOTES (Tools Or Technical Equipment Storage) compartment above the bottom bracket for a tube, levers, CO2 and a small multitool; no top-tube bento.

Which groupsets are compatible with the Dimond Trilliant?+

1x drivetrains are supported. Bottom bracket: PF30 (46 mm diameter x 68 mm wide).

What builds of the Dimond Trilliant are available?+

Trilliant Shimano 105 1x11: Shimano 105; Trilliant Ultegra Di2 1x11: Shimano Ultegra Di2; Trilliant Ultegra Di2 2x11: Shimano Ultegra Di2.

Can I fit my own aerobars on the Dimond Trilliant?+

Yes, third-party aerobars can be used on the Dimond Trilliant.

What warranty does the Dimond Trilliant 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

Sources

Dimond Trilliant data last updated 2026-11-02 · How the data is checked ·