TPMS (tire pressure monitoring system) - Page 12 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #111 of 134 (permalink) Old 01-03-2020, 12:07 AM
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Originally Posted by passx View Post
It always amazed me that the kawasaki c14 was one of the first bikes to offer TPMS as oe as a safety feature but Kawasaki absolutely refuses to put cruise control on it.
Exactly the reason, why Kawasaki lost me as a customer...got tired waiting for next gen C14.

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post #112 of 134 (permalink) Old 01-03-2020, 12:16 AM
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Actually that was my next question, the valve stem. I can see the issue with the rubber stem. If you follow one point of the rim around the circle, at the bottom this point has approx the same speed as the ground, 0, at the top it has the almost twice of the bike speed (almost because is is not on the outer edge of the tire), so it accellerates and decelerates from ~0 to ~2 x ground speed for each round, and with a "heavy" sensor cap on top, this is not ideal. I have no plan to replace my tires for now, so should my rubber stems stop me from order the Fobos, or is it just some disclaimer of liability by the manufacturer and nothing to worry about?
/rogerf
I must be as dumb as a stone, because that's the most nonsensical thing I have ever read. Sorry.
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post #113 of 134 (permalink) Old 01-03-2020, 12:23 AM
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I must be as dumb as a stone, because that's the most nonsensical thing I have ever read. Sorry.
Yes. Other things started happening immediately after reading, no time to reply.

What he says is true with respect to the road. But as far as far the valve stem is concerned it is always going the same speed, steady unchanging centripetal acceleration.
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post #114 of 134 (permalink) Old 01-03-2020, 03:17 AM
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philharmonic, I had no intention to start a discussion about dynamics, this is nothing about being dumb, from school I remember dynamics was never easy and straight forward.
A point of the wheel will have a constant force/acceleration pointing in to the center of course when spinning, but if the wheel is rolling without slipping, this point will also have an acceleration and retardation during rotation caused by the change in velocity of the actual point.
If you don't thrust me, and why should you, there is tons of articles about this on internet, here is a couple...

The best one where he explains velocity and acelleration for a moving wheel and a spinning wheel and combined a rolling wheel.



(see the start and from 3:00 and out to skip the formulas)

https://www.coursera.org/lecture/dyn...-surface-zXOPH

(skip the formulas)

https://books.google.no/books?id=EnZ...20wheel&f=true


For the valve stem, this will cause the stem to be bent forward and backward for each round, and will cause fatigue stress and probably cracks after some time.

/rogerf

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Last edited by rogerf; 01-03-2020 at 07:04 AM.
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post #115 of 134 (permalink) Old 01-03-2020, 03:50 AM
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Yup. Plus the additional weight on the stem when running hey-diddle-diddle speeds is "an issue" that may or may not create fatigue if you have rubber stems.


Bottom line is additional complexity means additional failure points that may be outside your ability to fix it without shop equipment you can't afford to own. Remember the K-Pass on the C14?

don't use rubber valves! simple.
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post #116 of 134 (permalink) Old 01-03-2020, 08:23 AM
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Originally Posted by rogerf View Post
philharmonic, I had no intention to start a discussion about dynamics, this is nothing about being dumb, from school I remember dynamics was never easy and straight forward.
A point of the wheel will have a constant force/acceleration pointing in to the center of course when spinning, but if the wheel is rolling without slipping, this point will also have an acceleration and retardation during rotation caused by the change in velocity of the actual point.
If you don't thrust me, and why should you, there is tons of articles about this on internet, here is a couple...

The best one where he explains velocity and acelleration for a moving wheel and a spinning wheel and combined a rolling wheel.

https://www.youtube.com/watch?v=Mryg-pQ2JmM

https://www.youtube.com/watch?v=4r1xgrWbALg

(see the start and from 3:00 and out to skip the formulas)

https://www.coursera.org/lecture/dyn...-surface-zXOPH

(skip the formulas)

https://books.google.no/books?id=EnZ...20wheel&f=true


For the valve stem, this will cause the stem to be bent forward and backward for each round, and will cause fatigue stress and probably cracks after some time.

/rogerf
Roger, you are obviously much smarter than me, and I apologize for my tone. Later on today when I have more time, I will look at your post and follow your links and maybe they will help me understand. Right now N$HHE's explanation is where my mind is leaning.

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post #117 of 134 (permalink) Old 01-03-2020, 09:17 AM
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I followed the links. They were very informative, but my stems still donít actually speed up or slow down unless I do. While they maintain a consistent speed while Iím traveling at a constant speed, I found in the linked video that theyíre pulling a lot more gís than I would have guessed. Those alone are a clear case for concern with rubber stems.
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post #118 of 134 (permalink) Old 01-03-2020, 09:28 AM
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I followed the links. They were very informative, but my stems still don’t actually speed up or slow down unless I do. While they maintain a consistent speed while I’m traveling at a constant speed, I found in the linked video that they’re pulling a lot more g’s than I would have guessed. Those alone are a clear case for concern with rubber stems.

Well, they rotate at a constant rotational speed, and your bike have a constant horizontal speed, but your stem does not have a constant speed.

At 6 o'clock it have the rotational speed - your bike speed = 0.
At 12 o'clock it has the rotational speed + the bike speed = 2 x bike speed (or 2 x rotational speed as they are equal)
At 3 and 9 o'clock it has the bike speed in horizontal direction combined with the same speed in vertical direction (up or down).
Changing of speed is accelleration and causes forces from a mass. The accelerations will be both ways and bend the valve stem forth and back, which will sooner or later cause cracks.

Roger
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Last edited by rogerf; 01-03-2020 at 09:37 AM.
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post #119 of 134 (permalink) Old 01-03-2020, 11:19 AM
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philharmonic, I had no intention to start a discussion about dynamics, this is nothing about being dumb

Made me think of this T-shirt.
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post #120 of 134 (permalink) Old 01-03-2020, 11:24 AM
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