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Extention Heimdall street-trials bike


New product

In stock

$ 1,027.47

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Entry level street-trials bike from new brand Extention, the Heimdall features a 15mm thru-axle and an internally routed front brake hose - features not found on any other bike at this price point. Horizontal dropouts are coupled with excellent chain tugs and massive M10 bolts - an important addition to firmly secure the rear wheel.

New model features minor upgrades such as alloy crank bolt and an updated top cap for the stem allowing adjustment using an allen key instead of a large flat spanner. Tyres have been changed to Kenda Kiniptions for better rolling properties and greater stiffness.

We consider the geometry of Extention bikes to be among the very best with standard measurements not reflecting what makes this bike so versatile - a longer front triangle and shorter fork rake. This is the first short wheelbased street-trials bike to have ample wheel clearance for barspins. 

✅ Custom upgrade - uprated Sapim spokes

✅ Brake hose installed through steerer tube as standard

Bikes ship within 24 hours of payment. Shipping to Europe from 12EUR. Delivery times within EU range from 2-4 working days. 

Frame and fork:

  • Extention Heimdall disc frame
  • Extention Heimdall 1 1/8", 15mm thru-axle, disc fork



  • Extention Forged, 90mm x 35*
  • Extention 6061 reinforced tripple butted high riser bars
  • Extention sealed headset
  • Rubber grips



  • Extention Forged 6061 CNC BB24 crankset
  • Extention 7075 CNC machined 22T bash, 22T sprocket secured by 4 bolts
  • Extention 108.9 16T freewheel
  • Shanmashi platform nylon pedals
  • Yaban chain 
  • Extention steel chain tugs

Front wheel:

  • Extention 15mm hub, disc
  • MT disc rim, double wall
  • Sapim spokes
  • Sapim Polyax brass nipples
  • Kenda Kiniption 2.3" tyre
  • Kenda tube


Rear wheel:

  • Extention 135mm hub, 10mm bolts
  • MT disc rim, double wall
  • Sapim spokes
  • Sapim Polyax brass nipples
  • Kenda Kiniption 2.3" tyre
  • Kenda tube



  • Magura MT Sport, MT4, MT5, MT7, MT Trail Sport brakes
  • Magura QM12 adaptors
  • Magura Storm 180mm rotors



  • 10.52kg (MT5)
Warranty6 months
BB rise15mm
Head tube angle74*

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Extention Heimdall street-trials bike