BMX Bikes / M / Mongoose / 1979 Mongoose Motomag
1979 Mongoose Motomag

1979 Mongoose Motomag

Weighing in at 34 pounds (15 kilograms)...

...this was BMX before the "lighter is better" arms race began.


This bike has the totally unnecessary and insane distinction of completing RAGBRAI XXXVIII's century loop TWICE in one day.


From 1987 to 2008, this bike's head-tube held the crown for "World's Raddest Wasp's Nest" but those days are over - this bike is a rider!


Many thanks to the 1977 Mongoose Manual provided by, where I learned how to properly adjust my axles, headset and bottom-bracket - and many thanks to for their invaluable BMX Restoration forum.


Bike blog:

BMX mongoose - Park tools, precision bearings and mayhem.


BMX mongoose

"Prepare to eat my dust!"


BMX mongoose

"Okay, one more pose before I beat everyone."


BMX mongoose

For those who don't already know, RAGBRAI is a 7 day bicycle ride across the entire state of Iowa where you will be pursued by a horde of giant robots that are trying to kill you. Riders that make it to the end will receive a big-prize: their lives.


BMX mongoose

The release waiver mentioned something about dinosaurs.


BMX mongoose

Bike MS


1623 2/2/11

Submitted by zeekle

  • Race
  • Company: Mongoose
  • Model: Motomag
  • Wheel Size: 20"
  • Headtube size: 1"
  • Details
    Serial Number:

    Original Factory Parts:
    Nickel Plated Frame: Chrome Moly (front tubes), Alloy Motomag II wheels, TANGE TX-1200 Champion forks, ashtabula stem, ashtabula cranks, sprocket, headset, bottom-bracket set, black vinyl seat, seat post and seat clamp.

    Vintage 1970s & 1980s Parts:
    TANGE TX-1200W Champion forks, Winners Circle Octopus Grips (black), Mongoose Gold Spider, KKT Rat Trap Pedals (chrome), Takagi Chainring (gold), DURA ACE alloy cranks (175mm), Pro Class Mini Rims, CO UNION Wheel Cover (aero disc), SATE-LITE 709 wheel reflectors, SATE-LITE 700 front and rear reflectors, "Mongoose" ZAP PADS (not pictured), Schwinn handlebars (chrome), chain tugs.

    New Replacement Parts:
    Z-Chain, new bearings for headset and bottom-bracket, Rat Trap pedals, KENDA "KONTACT" tires, BELL "COMP III" tires, Primo Comet with Kevlar Belt tires, Spur/Star style Chain Tugs (chrome), authorized reproduction stickers from

    Long Distance Racing Parts:
    Stem-Raiser (black, 21.15 mm) from
    22 INCH SEAT POST (chrome moly 4130, 1/8 inches thick, .22mm or 7/8 inch diameter) I smuggled it out of Area 51 but later I found out you can just buy them here: