DT Swiss XR421 DT 240 EXP hand-built wheelset

A DT Swiss XR421 rim set laced 28-spoke front and rear to DT 240 EXP hubs, built by hand in our Marrickville workshop, tensioned, stress-relieved and trued before it leaves the bench. Our Pro wheel build and tubeless tape fitted are included and show as two free lines in your cart.

Before you order — what your bike decides

  • Wheel size — 29". Read it off your tyre sidewall.
  • Rear axle — Boost 12 × 148, 12 × 142 or Super Boost 12 × 157. Boost 12 × 148 is most modern MTBs, Super Boost 12 × 157 some Pivot and Knolly frames, 12 × 142 older frames: measure the inside of the dropouts.
  • Front axle — Boost 15 × 110, 12 × 100 or 15 × 100. Boost 15 × 110 on most modern forks, 20 × 110 on DH forks, 15 × 100 on older forks: check the fork lowers.
  • Rotor mount — Centre Lock or 6-bolt: look at your rotors (six bolts, or a splined centre with a lockring).
  • Cassette — the freehub body follows it: Shimano 12-speed MTB is Micro Spline, SRAM Eagle is XD, Shimano 11-speed and older (and CUES LG) is HG. This 28H DT 240 EXP rear is made in three MTB versions: Boost 12 × 148 6-bolt with SRAM XD, Boost 12 × 148 Centre Lock with Shimano Micro Spline, and Super Boost 12 × 157 6-bolt with Shimano HG. Pick one of those pairings; if you choose another we will contact you before we build.

Choose the same rotor mount front and rear unless your rotors differ.

Who it is for

For cross-country racing and marathon riding. Not a rim for jumps or bike parks — see the XM431 trail kits.

The rider's questions

  • How much can it carry? Max system weight (rider, bike and gear) 120 kg — the DT Swiss XR421 rating, the lowest-rated part of the build.
  • What tyres fit? 2.1–2.7" tyres are DT's recommended range for a 30 mm inner width; 1.85"–2.05" and 2.8" are possible. The tyre's own maximum pressure applies; the rim sets none.
  • E-bike? DT approves the DT 240 EXP for e-bikes to 100 Nm of motor torque; above 55 Nm DT recommends the 350 Hybrid and above 100 Nm requires it — see our Hybrid and Pro 5e kits for a full-power motor.
  • How fast does the hub engage? 36 points of engagement — Ratchet EXP 36, 10° between clicks. The EXP 54 ratchet kit is a drop-in upgrade (sold separately).
  • Warranty? DT Swiss parts 24 months from purchase; our build work is guaranteed. Any claim comes back to Tune Cycles — see the Warranty tab.
  • How long does it take? Built to order from supplier stock — we confirm the build date by email when you order.

Kit includes

Options: rim diameter 29" · rotor mount Centre Lock or 6-bolt · front axle Boost 15 × 110 (12 × 100, 15 × 100) · rear axle Boost 12 × 148 (12 × 142, Super Boost 12 × 157) · freehub Shimano HG, Shimano Micro Spline or SRAM XD · tubeless valves (50 mm, up to 2).

Everything in the Wheelset box is built in. The rows under Upgrades are optional: tick what you want and the price updates. If you want us to lace a rim or hub you already own, that is a workshop job — contact us for a quote.

Sold separately (shown with this kit): tubeless sealant (Muc-Off No Puncture 140 ml), Upgrade Kit Spring,Grease,54 T Exp Ratchets — the engagement upgrade that fits this hub, RT-CL700 160 mm Centre Lock rotor, SM-RT66 160 mm 6-bolt rotor, the Shimano SM-RTAD05 adapter (runs a 6-bolt rotor on a Centre Lock hub; not with SM-RT86 / RT76 aluminium-carrier rotors), a cassette for your freehub body, tyres to suit (sizes above). Rotors: one per wheel, to match your rotor mount and your brake caliper's size range.

How we build it

Every wheel is laced by hand in Marrickville, brought up to tension evenly to the lower of the rim and hub limits (1200 N), stress-relieved and trued, then checked again before it is packed. Tubeless tape (32 mm) is fitted to the rim; add valves and sealant and it is ready for tyres.

Tune Cycles builds and fits these wheels. If you are unsure what your frame, fork or drivetrain takes, ask us before you order.

DT Swiss rims and hubs are covered for 24 months from purchase against material and manufacturing defects (dtswiss.com/en/support/warranty); riding outside the rim's ASTM category voids it. Our build — lacing, tension and truing — carries our workmanship guarantee. Any claim comes back to Tune Cycles: bring the wheel to Marrickville or contact us with your order number and we handle it with the brand. Wear, crash damage, corrosion and incorrect fitting are not covered.

  • DT Swiss XR421 rims — 30 mm internal, welded, PHR spoke bed, ASTM 3; 29"
  • DT 240 EXP hubs — 36 points of engagement, Ratchet EXP 36; Centre Lock or 6-bolt; Boost 15 × 110, 12 × 100, 15 × 100, Boost 12 × 148, 12 × 142 or Super Boost 12 × 157; freehub Shimano HG, Shimano Micro Spline or SRAM XD
  • Spokes — 28 × DT Competition front, 28 × DT Competition rear; the DT Pro Lock Squorx nipples supplied with the rims
  • Your bike's fit from the dropdowns: size, mount, axle, freehub — nothing is pre-selected, choose each one
  • Hand-laced, tensioned, stress-relieved and trued in Marrickville — Pro wheel build and tubeless tape included (two free lines in your cart)
  • Serviceable and upgradable: Ratchet EXP, the EXP 54 kit and freehub bodies available separately
  • Editable kit: the Upgrades rows are optional and the price follows what you tick
  Front Rear
Rim DT Swiss XR421 DT Swiss XR421
Rim construction welded, PHR spoke bed welded, PHR spoke bed
Diameters offered 29" 29"
Internal width 30 mm 30 mm
Rim depth 20 mm 20 mm
ERD 29" 604 mm 29" 604 mm
Spoke holes 28H 28H
Hub DT 240 EXP DT 240 EXP
Axle Boost 15 × 110, 12 × 100 or 15 × 100 Boost 12 × 148, 12 × 142 or Super Boost 12 × 157
Rotor mount Centre Lock or 6-bolt Centre Lock or 6-bolt
Freehub bodies — Shimano HG, Shimano Micro Spline or SRAM XD
Engagement — 36 POE — Ratchet EXP 36
Spokes 28 × DT Swiss Competition 2.0/1.8/2.0 double-butted black J-bend spokes 28 × DT Swiss Competition 2.0/1.8/2.0 double-butted black J-bend spokes
Nipples The DT Pro Lock Squorx nipples supplied with the rims The DT Pro Lock Squorx nipples supplied with the rims
Tape fitted 32 mm tubeless tape 32 mm tubeless tape
Valves optional, 50 mm tubeless valves optional, 50 mm tubeless valves
Max spoke tension 1200 N 1200 N
Max system weight 120 kg (rider, bike and gear) 120 kg (rider, bike and gear)
Tyre width 2.1–2.7" recommended (53–69 mm) 2.1–2.7" recommended (53–69 mm)
Intended use XC — ASTM 3 XC — ASTM 3
E-bike rating DT: approved to 100 Nm motor torque (Hybrid recommended above 55 Nm) DT: approved to 100 Nm motor torque (Hybrid recommended above 55 Nm)
Warranty DT Swiss parts 24 months from purchase DT Swiss parts 24 months from purchase
Built by Tune Cycles, Marrickville — Pro wheel build and tubeless tape included Tune Cycles, Marrickville — Pro wheel build and tubeless tape included
SKU WHL-BUILD-XR421-240
Brand DT Swiss

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