Mongoose 12" M LilGoose

Smoother shifting, more powerful brakes, better suspension fork performance. The Avalanche Expert is equipped with the most capable components within the lineup, feeding you the confidence to progress your singletrack skills on climbs, descents and all the straightaways you can handle.


KidFit™ technology has been embedded into the design of every juvenile bike we make from the LilGoose to the Racer X. Learning to ride can be tough. But, KidFit™ features like easier gearing and improved rider positioning help make those first experiences a lot easier.



-24/16T drivetrain; 1-piece forged steel 89 mm crank

-12” wheels with 2.125” sidewalk tires

-Mongoose® Hi-Ten 130 mm rise handlebar

The Urban Pedaler Promise
Each bike purchased with us includes:


  • Professionally built and inspected by an experienced bicycle technician
  • Free minor adjustments for 30 days from purchase
  • Free first tuneup between 3 and 6 months from purchase – valued at $149 – does not include parts
  • Lifetime Warranty on bike frames and Limited Warranty on complete bikes, subject to brand-specific inclusions

Frame Tectonic T1, aluminium, 12” kids geometry, 100 mm dropout

Fork Mongoose, 12”, steel steerer, 100 mm, bolt-on



Crank 1-piece forged steel 89 mm, 24T steel chainring

Chain KMC Z410

Bottom Bracket Internal, 1-piece, American, 68 mm shell

Cassette Single-speed, 16T



Rims Aluminium single wall, 16H

Front Hub Steel, 3/8 in axle, 16H

Rear Hub Steel, 3/8 in axle, 16H, coaster brake

Spokes 14G, stainless steel, Black

Tires Mongoose, 12 in x 2.125 in, wire bead


BRAKES Aluminium calliper front, rear steel coaster brake



Handlebar Mongoose, Hi-Ten steel, 500 mm width, 130 mm rise, 22.2 mm clamp

Pedals Kids, plastic

Stem Aluminium/steel, quill, 30 mm ext., 22.2 mm clamp

Headset Threaded, EC22.2/27, retainer bearing

Seat Post Aluminium, integrated saddle, 25.4 mm

Saddle Mongoose Kids, integrated rails

Grips Mongoose, kids


Rear fender, number plate, handlebar and stem pad, steel training wheels


Stock levels are improving this year and if we don’t have it in store it’s probably on it’s way! Supply chain issues have all bike brands experiencing significant delays. For some popular models and sizes we are taking preorders against future arrivals. Those with pre-orders in place will get priority allocations when limited stock arrives. 03 9557 6461