Author Topic: Preworn teeth, and only every second one at that, in future Shimano chainrings  (Read 2218 times)

Andre Jute

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The image is from BikeRumor
http://www.bikerumor.com/2016/02/01/is-shimano-losing-teeth-to-make-lighter-better-shifting-chainrings/
where the editors explain:
"Want to reduce weight? Cut drag and friction? Easy, just remove every other tooth."

Yup, and pre-degrade the teeth, which will save 9.137529 (recurring) nanograms of mass.

Joking aside, there's a good deal of technical interest in that article of possible ways to lay out driving teeth.

Bill C

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looks a lot like inch pitch, i spose it uses an i-chain  ::) ? it will be elliptical chain rings next, this modern tech stuff where will it all end?

mickeg

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I have seen track chainrings that look like that in the past, but that was not for derailleur bikes.

I took the attached photos in the Smithsonian Institute in spring 2013, a museum in Washington D.C.  The camera I had does not have a good flash, so I was trying to take photos without the flash, but it was quite dark so the photos are pretty poor.  Sorry.  The first two photos have a vintage bike with that same tooth pattern on the chainring.  I do not recall for sure, but it is possible that this was a Wright Brothers bicycle.

The third photo, is that a chainglider?

Bill C

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Andre Jute

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It looks like early cycling manufacturers soon agreed on an inch-pitch, Bill.

That surely looks like an early Chainglider, George. Presumably the wax model is of Major Taylor, the early cycling hero.

il padrone

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It looks like early cycling manufacturers soon agreed on an inch-pitch, Bill.

That surely looks like an early Chainglider, George. Presumably the wax model is of Major Taylor, the early cycling hero.

Major Taylor was a black man  ???

Andre Jute

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Presumably the wax model is of Major Taylor, the early cycling hero.

Major Taylor was a black man  ???


il padrone

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Guess my colour-blindness is playing up. That dummy does not look black to me ???  ???