I was out on a mountain ride with a couple of mates- one P plater and another supposedly seasoned rider, who's actually a very good friend of mine buy I've only ever ridden with him 3 times in the past. The experienced rider was on a motard which he'd borrowed off a mate. He led the ride since we were on a road I'd never been on (he wrote his own bike off a couple of months ago). He was riding pretty poorly tbh and I wanted to pass him and leave him in my dust,I'm good at reading roads and we weren't going all that fast at all. The thing about this motard is the mirrors are for decoration only. He had pulled a gap because me and the P plater slowed down to look at the aftermath of a motorbike accident. I caught back up to the motard and as I entered a corner behind him I noticed he was slowing down, so I trail braked through the corner. Im looking ahead (past him) and could see the road was clear and opened up onto a tiny straight. As I'm exiting the corner I notice he's slowing even more so I dive of the brakes harder and I'm thinking "woh shit he doesn't know him behind him, he's slowing down to wait up for me." I thought ok this is gonna be a little close. Then to my absolute amazement he comes to a complete stop and puts his feet down. He's smack bang in the middle of the lane on the exit of a corner, stationary with his feet down. I was already on both brakes, I knew i was fcuked and screamed aaaaarrrrggggghhhh and slammed up the back of him with my back brake fully locked.. I hit him square in the back tyre and went flying over the handlebars, but luckily due to the fact that it was a corner the momentum threw me off into the side of the road with my bike following me. All sorts of shit went through my head when I realised I was flying through the air. I swore my head off at him and we picked the bikes up and I few cars stopped and gave us a hand. This guy is my mate but fcuk I'm pissed off. I gotta let it go but this is my vent fcuk fcuk fcuk!!! Long story short my R1 is fcuked, his motard is fine. I was trying to sell my bike so now I'm screwed. It won't be a write off. The reason why I'm so annoyed is it was such a stupid accident that didn't need to happen, I was lucky not to get hurt bad, if I was on the pace I'd probably have gone over the fence and off the cliff. As for my mate who just stopped without looking behind him properly, what if I was a car? In my mind the only reason I hit him was because I had no indication he was stopping. If he'd even pulled to the side of his lane or better yet pulled off the road and indicated instead of riding the brakes into his ass I'd have release my tail brake and just casually gone around him.. This was a narrow two lane mountain pass, you got no business stopping on it to wait up for your mates.. I'm used to riding with people who understand these simple things. In case anyone wonders why I avoid group rides like the plague this is why. I choose who I ride with very carefully for a number of reasons. Oh by the way I got it on video. I'll post it up down the track after insurance is sorted out and the dust between me and my mate has settled.