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1979 Mongoose Motomag

1979 Mongoose Motomag

1979 Mongoose Motomag. 70's MX style build.

I started by purchasing the frame only for under $100.00.  Spent a few weeks polishing up the dull nickel and realized it wasn't too bad.  Still had no direction for the bike.  Next I found the NOS Ashtabula forks with nice OG finish, found a set of correct fork decals and a decent reproduction Motomag decal set. I then realized my goal was to build up a 70's style Motomag but with beefy looking wire wheels.  I wanted to go with the MX motocross 70's look so everything had to be era correct or as close as possible.  I tried to find gently used or NOS parts to build this up and as close to late 70's as possible.  Wheels came from a 79 Takara outlaw, refinished a set of Ashtabula cranks that had the Ashtabula in the drive side arm.  Refinished a set of Mongoose box bars and stem as they were both pretty tough looking coming from a 81 Mongoose.  In hindsight I probably could have gotten away the OG finish on the stem, but the cranks had rust and the bars had some layers of paint so they needed to be stripped.  I used a AS seat Clamp and a Persons seat originally as the correct parts were so expensive.  Took me about 4-5 months to find the original parts for the bike, refinish what I needed to and build it.  I just can't see paying top dollar for all the parts, every part had a price I was willing to pay to build this bike and the original build total came in under $500.00.  I let it sit like that for about a year, then this year I started refining a little, added a correct Mesinger Mongoose seat, a Mongoose stamped seat clamp, Chrome KKT rat traps to replace the black victors,  added an NOS vinyl pad set, a Hunt Wilde number plate Correct Tange bottom Bracket and Tange Motocross Headset top nut.  All name brand stamped correct stuff. 


New pictures posted


Submitted by hurlz

  • Dirt Jump / Trail
  • Company: Mongoose
  • Model: Motomag
  • Wheel Size: 20"
  • Headtube size: 1"
  • Details 1979 Motomag nickel frame, 1979 stamped Ashtabula fork - OG finish, NOS set of Ashtabula Decals, Mongoose stamped sprocket 44 tooth, Mongoose Box Bars - refinished, Mongoose Ashtabula style stem - refinished, Mongoose Stamped Seat clamp, Mesinger Mongoose seat with nameplate, KKT Chrome Rat Trap Pedals - NOS, Ashtabula '77' dated cranks - refinished, CMC 20 X 2.125 Chrome rims Shimano Coaster brake, Kenda K-44 tires, Vinyl Pad Set, Hunt Wilde Number plate Tange Stamped 24 TPI Bottom Bracket Tange Motocross Japan stamped headset nut