Mostek Funn RSX Direct Mount czarny, obejma 31,8 mm, rise 30 mm
Mostek Funn RSX Direct Mount czarny, obejma 31,8 mm, rise 30 mm
Mostek Funn RSX Direct Mount czarny, obejma 31,8 mm, rise 20 mm
Mostek Funn RSX Direct Mount czarny, obejma 35 mm, rise 30 mm
Mostek Funn RSX Direct Mount czarny, obejma 35 mm, rise 20 mm

Funn

Funn RSX Direct Mount Stem, Black — Sur-Ron and dual crown forks

€86,95

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Funn RSX Direct Mount in black — a direct mount stem that bolts straight onto the stock triple clamp of a Sur-Ron, Talaria or E-Ride, replacing the factory bar clamps. Full CNC from aerospace-grade AL6061, with adjustable reach and two rise options.

What it brings on an e-moto

The factory bar clamps on an e-moto already sit on the upper crown of the fork — and that is exactly what the RSX replaces. The gain is not a change of mounting system but what you get in return: 45/50 mm of reach adjustment, a choice of 20 or 30 mm rise, and a far wider, stiffer clamp that keeps the bar put after hard landings. On top of that, you set the bar position to suit you instead of riding what the factory chose.

On a downhill bike the RSX replaces a conventional steerer-clamp stem — there you also gain a lower front end, because the steerer clamp and the spacers disappear.

Key points

  • Plug & play fitting — goes onto the stock e-moto crown, no modifications and no extra adapters
  • Adjustable 45 or 50 mm reach — one stem, two settings, no second stem to buy
  • Reversible sides — swapping the sides changes the spacing between the bar clamps, wider or narrower
  • Full CNC AL6061 — aerospace aluminium, stiffness without the extra weight
  • Wide clamping area — the bar holds firmly and will not rotate after an impact
  • Black finish — also available in grey

How rise is measured here

Worth knowing, because it catches people out: on the RSX, rise is measured from the centre of the bar down to the direct mount interface — it is not bar rise. 20 mm gives a lower, more aggressive front end; 30 mm lifts the bar and is more comfortable over long stretches standing up.

Which version to choose

  • Sur-Ron: Funn points to 31.8 mm with 30 mm rise as the right pick
  • 31.8 mm — fits most e-moto handlebars
  • 35 mm — for thicker DH/MTB bars, more stiffness where bar meets stem

Measure the diameter at the thickest central section of the bar, where the clamp sits. 31.8 and 35 mm are not interchangeable.

Specification

  • Material: AL6061, full CNC machining
  • Mount: direct mount, 30 mm spacing (RockShox Boxxer / Fox 40 standard)
  • Reach: adjustable 45 / 50 mm
  • Clamp diameter: 31.8 mm or 35 mm
  • Rise: 20 mm or 30 mm
  • Weight 31.8 mm: 140 g (20 mm rise) / 160 g (30 mm rise)
  • Weight 35 mm: 137 g (20 mm rise) / 154 g (30 mm rise)
  • Colour: black

What it fits

Plug & play with stock e-moto forks — their upper crowns carry direct mount holes at 30 mm spacing, the same standard as Boxxer and Fox 40.

  • Sur-Ron Light Bee X and Ultra Bee
  • Talaria Sting and MX
  • E-Ride Pro
  • Downhill and freeride bikes with a dual crown fork

What decides fitment is the crown, not the badge: if your triple clamp has the direct mount holes, the stem goes on. Running an aftermarket fork or a converted front end? Send us a photo of the crown and we will confirm before you order.

Fitting

Tighten the bolts evenly, in a cross pattern, with a torque wrench — on aluminium clamps, guessing the torque ends in a stripped thread or a crushed bar. Check the torque again after the first ride.

Related

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