Hey engineers, and Bob too, tell me what you think about these new bike gears.

Pretty wild engineering idea

I think it will grate Parmesan very well.

Seems like your driving gear would take a lot of abuse on the leading edge. I would imagine slippage would become an issue with wear and the gear getting wet. Probably much better than a chain though when it's working right.

Robert J Sakimano wrote:

Watch Out Pylon! wrote:Seems like your driving gear would take a lot of abuse on the leading edge. I would imagine slippage would become an issue with wear and the gear getting wet. Probably much better than a chain though when it's working right.

this is what I was gonna say.

This is what I was gonna say.

tGreenWay wrote:

Robert J Sakimano wrote: this is what I was gonna say.

This is what I was gonna say.

This is what I knew you guys would say. Like anything, I’ll wait and see as it rolls out. I’ll read about the problems or success and make my decision in a year or so. I’m never the guy who is first to buy. Let the flaws work themselves out first. It looks cool.

I miss TempeTantrum

Should decrease the power lost through transmission, compared to a chain and derailleur. Carbon fiber so while the driveline could weigh more, I would guess the decreased loss of power should make up for it.

Senior Dickfist wrote:Should decrease the power lost through transmission, compared to a chain and derailleur. Carbon fiber so while the driveline could weigh more, I would guess the decreased loss of power should make up for it.

Smartest mother fuckers on the planet. Engineers.

Should clarify, carbon fiber is light, but there should be a shaft within that could be "heavy". I would think aluminum could be utilized assuming the right alloy is chosen. May need to be seamless tubing which is pricey, but I'm sure that whole system is pricey...lol.

I really do like it though. A few motorcycle manufacturers use shaft driven drive trains.

Senior Dickfist wrote:Should clarify, carbon fiber is light, but there should be a shaft within that could be "heavy". I would think aluminum could be utilized assuming the right alloy is chosen. May need to be seamless tubing which is pricey, but I'm sure that whole system is pricey...lol.

7075 should hold up to the stresses from your average dude pedaling. I'm sure everything has been run through FEA simulations.


For those not in the know: https://en.wikipedia.org/wiki/Finite_element_method

7xxx series suffers from stress corrosion cracking, but I'm sure it would work fine. I would start the FEA with 6082, which will cost less.

Senior Dickfist wrote:I really do like it though. A few motorcycle manufacturers use shaft driven drive trains.

Shaft drive motorcycles have been around since 1923. Think BMW was the first.

DWags wrote:

Senior Dickfist wrote:Should decrease the power lost through transmission, compared to a chain and derailleur. Carbon fiber so while the driveline could weigh more, I would guess the decreased loss of power should make up for it.

Smartest mother fuckers on the planet. Engineers.

OTPT and Pylon will tell you that science has proven it's because their ancestors ate the most Magic Mushrooms.

LooseGoose wrote:

DWags wrote:

Smartest mother fuckers on the planet.    Engineers.

OTPT and Pylon will tell you that science has proven it's because their ancestors ate the most Magic Mushrooms.

What are you talking about rube? Some of us are trying to have an adult conversation. We don't need your childish antics screwing up another thread.