I was biking to work the other day and had a guy pass me using one of these on his front wheel. It was completely silent and he practically doubled my speed on

I was biking to work the other day and had a guy pass me using one of these on his front wheel. It was completely silent and he practically doubled my speed on a road bike just cruising. I'm used to being one of the faster commuters, so my brain did a pretty serious double take. Having had a nasty crash at normal speed I will say that I would seriously suggest wearing more protective clothing if you are going to roll with one of these.