Tues 29 Core 4

YT’s 2025 Tues MK4 is a carbon-only downhill race bike that keeps the brand’s familiar four-bar, Horst-link layout and leans into refinement rather than a clean-sheet suspension concept. Instead of chasing the current high-pivot/idler trend, the MK4 focuses on making one chassis cover more ground, with the same frame able to run dual-29 or MX depending on how you configure it.

That adjustability, plus the move to five sizes and practical updates like UDH and a threaded bottom bracket, shape the generation’s identity. The MK4 reads as a modernized Tues that’s meant to be set up around rider preference and venue, rather than forcing a single, locked-in “race-only” stance.

$6,89929/MXGen MK4

Image pending

Build

Size

Stack	640mm
Reach	446mm
Top tube	603mm
Headtube length	105mm
Standover height	731mm
Seat tube length	390mm

Fit and geometry

The MK4’s numbers point to a contemporary DH posture: a tall front end paired with a low bottom bracket, and a reach range that spans five sizes in even steps. In practice, multiple reviewers described a “tall standing stance” with hands “up high and almost over top of the front axle,” which helps the bike feel direct in flatter turns and when changing lines, but can make it feel more “pointy” when the trail gets steep and committing.

A big part of the fit story is that the frame is designed around adjustability that actually changes how the rider sits between the wheels. You can alter bottom bracket height and head angle at the lower shock mount, and you can tweak rear-center length via the dropout chip. Those are useful levers for riders who want to tune front-to-rear balance, or who are trying to calm the bike down for faster tracks versus make it easier to move around on jumpier park trails.

Wheel choice is also a fit variable, not just a handling one. Reviews suggest dual-29 brings more rear-wheel presence and rollover, but can reduce room to move for shorter-legged riders; MX creates more clearance and can make the bike feel easier to throw around.

Full specs

Frameset

Frame

Complete bike frame (size S, M), color: Shell White

Fork

FOX 40 Float Factory, 29", 203mm, GRIP2, 110x20mm, 52mm offset

Rear shock

FOX DHX2 Factory, 250x75mm, H/LSC + H/LSR, spring: 325 lb (S) / 375 lb (M)

Weight

16.1 kg / 35.36 lb (avg, smallest size, tubeless, no pedals/bottle)

Groupset

Shift levers

SRAM X01 DH, 7-speed, MMX

Rear derailleur

SRAM X01 DH, 7-speed, medium cage

Cassette

SRAM XG-795, 7-speed, 10-24T

Chain

null

Crankset

SRAM X01 DH, 165mm, 34T custom, DUB

Bottom bracket

SRAM DUB BSA 83 DH (BB DUB BSA 83 DH)

Front brake

TRP DH-R EVO

Rear brake

TRP DH-R EVO

Front rotor

220mm (2.3mm rotor)

Rear rotor

220mm (2.3mm rotor)

Wheelset

Front wheel

Crankbrothers Synthesis DH Alloy, 29", 31.5mm internal, 110x20mm, 6-bolt, Industry Nine 1/1 hub

Rear wheel

Crankbrothers Synthesis DH Alloy, 27.5", 31.5mm internal, 148x12mm, 6-bolt, Industry Nine 1/1 hub, XD driver

Front tire

Maxxis Assegai DH, 29x2.5 WT, 3C MaxxGrip, DH casing, TR

Rear tire

Maxxis Assegai DH, 27.5x2.5 WT, 3C MaxxGrip, DH casing, TR

Cockpit

Stem

Renthal Integra 35, 50mm, +/-6°, Black/Gold

Handlebars

Renthal Fatbar 35, 800mm width, 30mm rise, 7° back, 5° up, Custom Black

Saddle

SDG I-Fly 2.0 (YT Custom), 128mm width, I-Beam

Seatpost

SDG I-Beam Carbon, 31.6mm, 300mm length

Grips

ODI Elite Motion V2.1 (lock-on)

Builds

The MK4 lineup is split into three complete builds in this context, all centered on the same carbon frame and its wheel/geometry adjustment system. Pricing runs from $4,299 to $6,899, with Core 2 as the entry point, Core 3 CF in the middle, and Core 4 at the top.

Core 4 is the “ready to race” spec with Fox Factory suspension (40 GRIP2 and DHX2 coil), SRAM X01 DH 7-speed, TRP DH-R EVO brakes, and 220mm rotors front and rear. It also brings a more premium finishing kit, including a Renthal cockpit and carbon SDG I-Beam post, and comes stock as a 29/MX configuration with DH-casing Maxxis Assegai tires. Core 3 CF shifts the value proposition toward Ohlins suspension (DH38 and TTX22) and SRAM GX DH 7-speed, keeping the same TRP DH-R EVO brake model and 220mm rotors, with different wheels and cockpit parts.

Core 2 CF is the budget build, but the component details aren’t specified here, so it’s best viewed as the price-led way into the same adjustable chassis rather than a like-for-like parts alternative to the higher builds. If you’re choosing on ride-critical parts alone, the biggest material differences up the ladder are suspension brand/spec level, drivetrain tier, and wheel/cockpit kit.

29 Core 2 CF

$4,299

29/MX

29 Core 3 CF

$5,499

29/MX

29 Core 4

$6,899

29/MXSelected

Reviews

Testers tended to describe the MK4 as a downhill bike that feels quicker to respond than the geo chart suggests. Pinkbike said “hopping on it and riding around the car park, it feels more like a long travel enduro bike,” and highlighted that it “doesn't suffer from that wheel flop that you get with really slack bikes” (YouTube). That same review framed its personality as “sharp,” adding it’s “really easy… to find the edge” at the front (YouTube).

Across reviews, the suspension character comes through as supportive and speed-generating when you’re working terrain. Pinkbike called out “a lot of mid-stroke support” and “a lot of pop,” saying it’s “easy to pump and jump through rollers and carry speed” (YouTube). Enduro MTB echoed that, noting “good support and plenty of pop” for rollers, berms, and big jump lines, while also pointing out the rear end can “stiffen slightly” in fast, consecutive hits, costing some traction compared to the most composed bikes in their test (Enduro MTB).

The main tradeoffs reviewers returned to were feedback and personal fit. Pinkbike mentioned it can feel “noisy through the feet” in “high-frequency, high-speed chatter” (YouTube). BikeRadar also flagged “some pedal kickback in specific scenarios,” and noted dual-29 can create clearance issues for shorter riders: “the 29in rear wheel will buzz shorter riders” (BikeRadar).