Pee Wee Herman Famous Movie Bicycle Can Be Yours ... In Pieces

3/5/2014 8:26 AM PST

The bicycle that Pee-Wee Herman refused to sell for even a hundred million, trillion, billion dollars ... is up for sale ... but for a whole lot less.

One of the bikes used to film the 1985 flick "Pee-Wee's Big Adventure" is being auctioned on eBay ... and the owner tells us he has a letter of authenticity from the studio to prove it's the real deal.

Just one problem:  some assembly is required.

The seller says the bike is in pieces but he says all the parts are there -- including the bicycle bell and the handlebar streamers. He says he'll also throw in an autographed photo of Paul Reubens.

The owner tells us he bought the cruiser in 2010 for $10K ... he's hoping to get at least $15K for it from the auction.  Current bid is $8K.