3T - ULTRA
GRX 1X12 700c

3270,00 €

Color: Indigo

Bike:

On backorder

(Shipping on: 17.11.)

(Shipping on: 2.12.)

Size help

IT ALL STARTS WITH THE TIRES

Tires are the biggest factor in gravel bike speed—they affect comfort, grip, and aerodynamics. That’s why 3T measured hundreds of tires to get their actual dimensions, not just the printed ones. They use WAM (Width As Measured) and RAM (Radius As Measured) to shape the frame around real-world data. This ensures optimal airflow and enough mud clearance. Note: front derailleurs (especially electronic) can limit maximum tire width.

SO WHAT TIRE DO YOU NEED?

Picking the right WAM (Width As Measured) is key—it affects grip, speed, comfort, and flat resistance. The ideal WAM depends on terrain, rider skill, and speed. 3T offers a WAM guide and tire suggestions for different rim widths. Just note: using a front derailleur may limit tire size.

REALFAST AERODYNAMICS

Designing Ultra was a major aero challenge—starting with wide, knobby 650b tires and turning it into a fast bike. 3T shaped the downtube to catch messy air off the front wheel and used clever frame shaping to reduce drag. The result feels fast like a road bike, even when muddy.

ULTRA VERSUS RACEMAX, EXTREMA AND PRIMO

Ultra and RaceMax share geometry but serve different goals. RaceMax is fastest with 35–46mm tires; Ultra is optimized for 55–61mm 650b. Extrema fits huge 29” tires for extreme terrain, while Primo has a road feel with tire swap flexibility. Each model fits a different ride style.

WHAT’S MY FRAME SIZE?

Choosing the right bike size is crucial for a comfortable and enjoyable ride. Use this chart to pick the size which fits your body. Please note, this is merely a suggestion. For the best results, we recommend a professional bike fitting with an expert.

Key features

Aero frame & road-inspired riding position.Get to the worst roads fast with the aero frame & road-inspired riding position
Massive tires: keep your grip with massive tires (not very aero but you’d be surprised at the speed)
27.2mm SEATPOST & AERO SEATTUBE. Go for a standard round, dropper or suspension post inside the Ultra's aero seattube
Bikepacking: add a few packs and the Ultra is ready for epic overnight adventures

Product details
Delivery info
Size help

Details

Frame

ULTRA

Frame material

Unidirectional pre-preg carbon, High-modulus/high-strength performance blend layup

Headset

Integrated headset, sealed cartridge 1-1/8"+1.5", 36°

Fork

Fango Ultra w/ compact crown

Thru-axle

100x12 front - 142x12 rear

Handlebar

3T Superergo Pro (XXS: 38cm - 51: 40cm - 54&56: 42cm - 58&61: 44cm)

Stem

3T Apto Stealth (XXS:70mm - 51:80mm - 54: 90mm - 56:100mm - 58:110mm - 61:120mm)

Front derailleur

Rear derailleur

Shimano GRX RD-RX822 SGS RD+ 12s

Crankset

Shimano FC-RX610-1 40T (XXS: 165mm, 51: 170mm, 54&56: 172.5, 58: 175mm)

Brakes

Shimano BR-RX400 (SM-RT64 160mm rotors)

Shift/brake levers

Shimano GRX ST-RX610 12s

Cassette

Shimano CS-M6100-12 10-51T

Tires

Pirelli Cinturato Gravel M 700x40

Wheelset

Fulcrum Rapid Red 900, 700c, 22mm internal width, tubeless ready (upgrade to 3T Discus 45|40 , 45|32 , Plus i28 possible)

Seatpost

3T Carbon 27.2 round seatpost - Zero offset

Saddle

Selle Italia Model X Superflow

*Additional info

Specifications are subject to change without notice

At RimRebellion, we do everything we can to make the purchase of your new 3T bike as simple and worry-free as possible. You can choose between two delivery options – both completely free of charge:

1. In-store pickup at RimRebellion Store (Bratislava)

Order your bike online and pick it up directly at our RimRebellion Store & Community Café on Košická 27 in Bratislava. We’ll have your bike fully prepared, professionally set up, and double-checked with you before handing it over. You’ll also have the opportunity to consult with us on the spot – completely free.

2. Courier delivery to your address

We’ll deliver your bike conveniently anywhere in Slovakia. Before shipping, we carefully adjust, inspect, and pack your bike into a specially designed 3T box. Upon delivery, just a few simple steps are needed to complete the setup – we’ll guide you through everything.

You can easily choose your preferred delivery method in the cart during checkout.

GEOMETRIES

Size

XXS

Rider Height (cm)

145-160

157-171

168-180

176-186

183-195

192 & up

Rider Height* (inches)

4'9"-5'3"

5'2"-5'7"

5'6"-5'11"

5'9"-6'1"

6'0"-6'5"

6'3 & up

Stack

520

542

564

584

604

632

Reach

351

362

373

381

388

399

"Road" Headtube

122

142

158

175

196

225

Headtube angle

68,5

69,5

71,0

72,0

72,5

Fork axle-crown

375

Front center

597

606

602

607

616

636

Rear center

419

BB drop

Toptube length

510

527

545

559

574

593

Seattube length

436

463

490

518

549

576

Seattube angle

Technologies

PERFECT AERO CUTOUT

Close-fitting cutout to shield the rear wheel and achieve the most speed.

MIND THE GAP

No oversized gaps between front tire & downtube for better airflow transition and less turbulence.

HUGE CLEARANCE

The original Exploro set today’s standard for up to 51mm tire clearance. The Ultra has up to 61mm (650b tires)!

60MM DOWNTUBE NECK

Upper downtube necks down to 60mm to pick up the airflow coming off the front tire.

75MM DOWNTUBE BASE

Lower downtube aero profile is 75mm wide to fully shield water bottle.

SIZE-SPECIFIC DOWNTUBE

Reduced depth on smaller sizes to keep frame compliant and keep space for bottles.

MINIMALIST CROWN

Fork crown shapes haven’t changed much since brakes were attached there. Now that we have disc brakes, we don’t need that bulk of material and can reshape the crown for better strength, stiffness and weight. Plus better aerodynamics.

PURE-ROAD FORK LENGTH

With the shorter crown, we can make our forks 25mm (1 inch) shorter than other gravel bikes. Exactly the same as a road fork. This offers better stiffness, lower weight, an easier steering geometry and better aerodynamics.

DOUBLE-DROP CHAINSTAYS

Dropping the drive-side chainstay improves tire & crank clearance. Dropping the other side as well creates a much more efficient structure behind the BB for higher stiffness & strength as well as lower weight.

THREADED BB

Most of our complete bikes come with threaded BBs for the best alignment and to avoid any issues. Yet we avoid gluing threaded alloy rings into the carbon (added weight, complexity and debonding risk).

DIRECT-MOUNT REAR BRAKE

Standard frames require an adaptor to use a 160mm brake rotor. We have integrated that into the frame, meaning you don’t need any extra pieces to attach the brake.

DIRECT-MOUNT FRONT BRAKE

Standard forks require a flip-flop adaptor to set the correct brake rotor size. Our direct-mount pre-sets the caliper for 160mm rotors without any extra pieces.

INTEGRATED FENDER MOUNTS

Invisible until you need them. Perfect for our custom fenders.

SELF-ALIGNING WEDGE CLAMP

Self-adjusting bolt angle for higher clamping forces with lower torque.

AERO SEATTUBE+ROUND SEATPOST

The seattube is kept aero yet it fits a round 27.2mm seatpost so you have many round, dropper or suspension post options.

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3T - ULTRA GRX 1X12 700c

IT ALL STARTS WITH THE TIRES

SO WHAT TIRE DO YOU NEED?

REALFAST AERODYNAMICS

ULTRA VERSUS RACEMAX, EXTREMA AND PRIMO

WHAT’S MY FRAME SIZE?

Key features

Product details

Delivery info

Size help