Your video, CeramicSpeed 99% Efficient Drive Shaft // Chain Free Bike, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

Yeah, neat idea, but I'm not seeing the applications outside of (maybe) high end competitive racing where a few percent efficiency (that isn't offset by losses elsewhere, like weight) is worth it. In that case the aluminum would be okay because you'd just replace it after every event. For the likes of e-bikes and such, on the other hand, if you're going to use a shaft drive, why not just put the transmission entirely on the drive sprocket (maybe with a CVT like Netwboy suggets). This thing, as a whole, strikes me as too much out-of-the-box engineering without actually leaving the box. Of course, all that said, I'm always in favor of trying new engineering ideas so I approve.

I found the video interesting, mostly because the guy talking acknowledged that this clever tech required a redesign of half of the bike--work that hasn't been done yet.

I seriously doubt we'll ever see this on a production bike, because the engineering problems of making this work in the real world look insurmountable to me.

I just kept thinking to make this street legal, it needs plates, signal lights, brake lights, head lights... etc. But with those wheels on both front and back, where do you put everything else?

And that's beside the point of having fenders. which a bike legally needs, but imagine hitting water on the street or rain, the spray off that thing would be crazy.

Agreed. There have been numerous studies that show that happiness DOES increase with wealth.... up to a point.

Basically, struggling to buy food, pay rent, etc can make life miserable, but once you've got that covered more money won't necessarily make you happier.

In conclusion, money can't buy happiness but it can buy beer/mountain bikes/snowboards/holidays.

Two different mountain bike videos i thought you might enjoy.
https://youtu.be/X_vO84jH4is and https://youtu.be/gw_Bln5TP8o

I can hear the Crazy 88s pulling up on their bikes now, only thing missing was the Wilhelm scream.

bike is so in the fault. The car was inching although did end up slamming the brakes to avoid a full collision. The problem is the bike was going so fast and saw that in order to avoid the couple he needed to take his right side path around the pole. What he didn't see was the second vehicle behind the parked car that kept him from taking that path safely.

Your video, Melanie the Raccoon riding her bike, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

Your video, Jakub Kornfeil jumps out of trouble on a GP3 bike, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

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Reminds me of falling off a bike into prickly pear cactus. They go deep too, but at least thorns usually don't splinter more on the way out.
Ouch.

I will avoid riding a comedy clown bike in future!

Only 5 arrests? There were far more than 5 abandoned bikes.

@ 6:33 "a hundert bikes a month" - more like 100 thousand bikes

I agree with Mass Bike that the truck driver was responsible. Not sure that he should be criminally charged, that's a really big hammer to use on someone that almost certainly did not intend any harm. But he wasn't even cited, although he left the scene. He called the Boston police many hours later, from New Jersey.

That said, I would advise any cyclists to avoid ever putting themselves in the position that Dr Kurmann found herself in. It is dangerous to ride beside large vehicles with limited visibility, as we see. Also good to note that semi trucks frequently swing left to set up a right turn -- I don't believe she realized the danger she was in until the truck was close to actually passing in front of her.

The symbol in the middle lane is a "sharrow", which really indicates that the middle lane is not a bike lane. The sharrow is supposed to indicate to motorists that bicycles may be expected in the lane, and to remind cyclists that they are allowed to use it. The Boston police report gets this wrong, irresponsibly making the driving public stupider. At the time of the crash the right lane was used as a turn lane, and there was a bus stop just before the crash site, making it likely that cyclists would use the middle lane.

It's fun to say that you never trust anyone, but that can't literally be true. For example, I trust thousands of drivers standing at red lights or stop signs not to charge out and run me over. It would be almost impossible to move in traffic without relying on most drivers to do the right thing most of the time.