The brain holds many memorable events from our lives, including which bikes made an impact burnt in to the memory of their riders.
These bikes only hold a true relevance and meaning to the person that developed the relationship with them, with the attraction instantaneous or built up over time.
Mark Forsyth has over 35 years of riding experience on countless bikes and we'll hand over to him to sum up his three most memorable:
"First up is Doohan’s NSR500 just for its sheer unadulterated terror and violence when you try and ride it even remotely quickly. Yes, it was true, you could pop down to the shops on it, it's low speed running manners were so faultless but up the pace a bit and it'd just try and smash you to bits. I once new a bloke called John Fisher who used to head-butt people's faces, pebble dash walls (and probably his mother) and mainline anything he could get his hands on (sherry was his favourite intravenous tipple). He was pretty violent but looked like Mother Theresa alongside alongside HRC's finest ever 500cc two-stroke.
"I flew to the other side of the World to ride the V1000 and lived with its creator for a week. It wasn't a disappointment. For a dozen blokes working out of an old railway sidings building, the Britten V1000 was World class and made even a factory Ducati of the time look a bit pedestrian. It was so adjustable, in a just a few minutes you could make it steer like a BMX bike or Dennis Hopper's Harley chop. What a noise it made.
"250GP bikes are my all time favourite handling creations. Telepathic steering, minimal weight and ferocious corner speed. Just beautiful. The oh-so-pretty 550cc Ducati Supermono managed to combine this characteristic of near perfect weight distribution, immense corner speed and impeccable feedback and manners but with a super-smooth desmo motor that made a mockery of anything else around at the time in that class. My biggest regret is that I didn't buy one before the prices went through the roof..."
Continue as we asked some of racing's elite on their three most memorable bikes. First is Kevin Schwantz
After you've read the choices of racing's famous, please tell us about your most memorable bikes in the comments below.