Video: road.cc reader films moment he says his leg was cut by disc brake rotor

Nasty gash there. Hope you're back on your bike soon. 

Bit of an freak accident, as the Roubaix Rider got distracted by the hikers and never actually, you know, braked, (you can see his right hand lever completely free on impact). IMHO if you're not paying attention until you're about to hit someone; apply rule #5 and OTB it. 

As far as the bigger debate goes: people have died strangled by seatbelts. Yep, this is a clear-cut  rotor injury. There will be more. And alltough rounding off the rotors seems like an easy enough thing to do, IMHO disk brakes remain safer than rim brakes. And much safer than using calipers on carbon wheels. YMMV.  

Lesson learned, I'm sure they'll be a bit tighter with the skillz after this. 

WIll be interesting to see Specialized's response, if any. 

Where's the footage from the helmet cam of the guy on the red bike?

Not only is the group riding appaling, both of the riders who hit poor Peter need to learn some basic bike handling skills.

If you look closely at the video, the first rider who hits him, the guy in hi viz with the white bike, is riding on the hoods but when he finally realises Peter is slowing, instead of braking with his hands on the hoods, before attempting to brake, drops his right hand only into the drop, then goes to grab the brake but has his index finger between the brake lever and the handle bar, so even if he had managed to apply some brake before coming together, which it doesn't look like he did, he wouldn't have been able to get full power. His left hand is still on the hood but his fingers are nowhere near the brake lever.

As for the guy on the Red Roubaix, he isn't even looking ahead and ploughs into both of them, after veering left and again it doesn't look like his fingers are on the brake levers as he collided with them.

If it wasn't so bad it would be hilarious. I am only glad I don't ride with that group!!!

I guess disk brakes are only as effective as the 'cyclist' using them.

Using a mate's calf as the retarder is probably not the best idea.

Yes that 'group' riding was fairly shambolic, no comms at all.

The BMW driver was probably pissing himself laughing at mamils on their toys....

watched it about 10 times now - it's mesmerising - I love the way the knees out guy just about reaches his brake lever at the moment of impact

I was going to buy a new angle grinder this month but clearly disc brakes are better.

Rotating cutting tool... albeit with a blunt rounded cutting edge. This is the sort of incident that I could see doing exactly the damage it did. 

In higher energy impacts I'd struggle to see how the disc would remain in contact with the leg for so long, but in a slow incident like this, you can see how it happens. 

I must say the group were dis-organised and not paying attention to have this coming together.

 Unlucky injury, it could of been or not the disc rotor, there are so many sharp pointy bits on a cycle which can open skin like a stanley knife.

I really don't know how I've survived mtb and cyclocross for all these years without a disc injury!

So rounding off won't do much an external projection like that would require a larger radius than the thickness of the disc to be of any use. I think from memory on a car external projections need to be minimum 3.2 radius to be legal and that is only really affective at low speeds. I don't think the actual rotating disc is much of an issue either the issue is the minimum 60+ kg rider and bike hiting someone with a thin piece of metal at speed.
Either way discs aren't going anywhere but I can understand why racers are a little bit underwhelmed for them it yet another risk they have to deal with and the marginal gain (for them) doesn't seem to be worth it.
I'll take my engineers hat of now and go and look at some sexy bikes.

Right, that does it. As soon as I get home I'm going to remove the brake rotors from my bike. It'll make it much safer that way!

Okay,  so:

Assuming that the leg pictures are all of the correct orientation, how come he got a cut on his left leg from a right-side impact?
I'd say given the impact speed of the first bike it's the more likely culprit, but that still doesn't explain a cut on the front of his leg!
Or is it just me?

Does look suspiciously like the rotor could be the item causing the injury. I'm very pro disk but this looks fairly convincing.

OT I know. What the hell was making that noise? Has he got spokey dokes?

No sign on the audio that there was a verbal warning of a slowing/stop. The group I ride in shout out car up/down, junction stop etc.

Still believe there are far more pros to disk brakes than negatives.

..and yes, the group riding skills are appalling here. But you can't legislate for that and the manufacturers should have for seen such a situation.

That's pretty nasty. Regardless of my own anti-disc prejudices (I accept they're not going away any time soon.. ) why can't manufacturers round off the edges at least? Id be pretty pissed that new equipment these manufacturers are pushing could have injured me in that way due to the design.

Crashes are almost inevitable in group riding so should they perhaps revisit the design?

They should be more worried about their group riding skills.

I can't see ( in the video) where the rotor touches anyone???

Kudos, not so much as a muttered expletive. I'd be crying like a little girl.

At least the wound looks happy...

chicks dig scars! 

Didn't appear to aid stopping either.

*grabs popcorn*