Extention Heimdall street-trials bike
Once the entry level street bike of choice, the Heimdall has since integrated solutions from the more expensive models and now features a tapered head tube and Jarvis forks.
Holiday break. Ships after the 6th of August. Click for more information on international delivery.
Heavily updated for 2025, the latest Heimdall features a tapered head tube, stronger rims, screw on grips and a wide range of minor structural improvements. Blue bikes are supplied with Jarvis forks while black bikes are supplied with Heimdall forks. The primary difference between these two forks is the type of brake mount used.
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 Trialshop.pl upgrade - uprated Sapim spokes
✅ Brake hose installed through steerer tube as standard
This bike delivers to the EU in 2-4 days. Shipping starts at just €19. Check the delivery tab for details.
Frame and fork:
- Extention Heimdall disc frame, tapered
- Forks on blue bikes: Extention Jarvis taper, 15mm thru-axle, post mount
- Forks on black bikes: Extention Heimdall Taper, 15mm thru-axle, IS
Steering:
- Extention Forged, 90mm x 35* stem
- Extention 6061 reinforced tripple butted high riser bars
- Extention sealed headset
- Rubber lock on grips
Drive:
- Extention Forged 7050-T6 BB24 crankset
- Extention DUB bashring with integrated chainring
- Extention 36.6 16T freewheel
- Extention platform nylon pedals
- KMC Z1eHX chain
- Extention alloy chain tugs
Front wheel:
- Extention 15mm hub, disc
- Double wall reinforced alloy rims
- Sapim or CN Inox spokes
- Sapim Polyax brass nipples
- Maxxis Holy Roller 2.4" 24" tyre
- Kenda tube
Rear wheel:
- Extention 135mm hub, 10mm bolts
- Double wall reinforced alloy rim
- Sapim or CN Inox spokes
- Sapim Polyax brass nipples
- Maxxis Holy Roller 2.4" 24" tyre
- Kenda tube
Brakes:
- Magura MT Sport, MT5, MT7, MT Trail SL Carbon brakes
- Magura QM12 adaptor or Hope depending on availability
- Magura Storm 180mm rotors
- MT Trail SL Carbon brakes come switched meaning the rear brake uses a 4 pot and front a 2 pot calliper. These brakes are equivalent in performance to the MT7 and MT8 while maintaining lower weight thanks to carbon lever blades.
Weight:
- 10.34kg (MT5)
1294
New
Additional info
- Warranty
- 6 months
- Wheelbase
- 965mm
- BB rise
- 15mm
- Chainstays
- 362mm
- Head tube angle
- 74*
- Reach
- 660mm
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Once the entry level street bike of choice, the Heimdall has since integrated solutions from the more expensive models and now features a tapered head tube and Jarvis forks.
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