I have a couple individual motorcylce papers that I picked up at scrapbook stores. I don't know who makes them. But I just googled "motorcycle scrapbook paper" and came up with quite a bit. Not a lot of paper but plenty of die cuts, stickers, etc.
I do motorcycle scraping and trust me, it's hard to find stuff. Look for masculine papers, with tire marks, wheels, cogs and tools. Look for black, grey, papers with textures. Do some grungy inking and paper tearing. I went to my local Goodwill store and bought a toy truck and took off the wheels. You need soft wheels....Ink those and roll across the page. Also look for skull papers and embellishments that are not too Halloween. You can use patches from clubs or events. The Kaisercraft Basecoat collection would be good for you....also any denim or leather looking items.
It's difficult to find a book too, I made one by adding fringe and pieces of an old belt.
I have some papers (I think they are WRMK but maybe not) - they are travel-by-the-road style but not necessarily motorcycle - with tire tracks, gas station signs, stylized masculine dusty road kind of look.. maybe you can search the travel collections for something suitable for you project?