Other Stuff > Misc / Open
Tyre technicals...
Lobo:
...so far I think Julie’s winning on the explanation given the Ozzies have a penchant for doing things, um, differently.
Nige, I want to get where you’re coming from, but (1) the tyre must at all times have some sort of friction (otherwise it’d be akin to riding on black ice) so even when rolling along water appears to be pumped to just where ya don’t need it.
And (2), under heavy braking I’m struggling to see how the dynamics change in this respect ... the outside tread is ‘charged’ with water, and as the tyre rotated forward is even more compressed (due flattening) and pumped to, er, just where ya don’t need it. Yes the force is one of retardation, but the tyre is still rotating forwards....
I totally accept I am wrong in the logic... but still fail to ‘get it’
Ken, the rear is fitted with tread the other way ‘round... phew (I think.)
Daftly, I can’t find any ‘Direction of Rotation’ markings on the sidewalls. Maybe I’ve simply missed ‘em, but it does seem a tad dangerous given the front wheel can be put back either way ‘round.
Steve... that’s a total bloody cop out! (and god help me I tried to get these photos orientated up (ie held the phone vertical).... aargh.)
(PS - Ken... have been looking at TPMS... do yours replace the valve (and if so are you happy with that)... or are they bluetoothing up to a handlebar display?
SteveD CB500K0:
We had the Michelin guys present tyre design at our bike club.
“Forget the rotationâ€
A tyre is subject to a force from the road surface which squashes the tread.
If you look at your picture and imaging pressing a credit card sized contact patch into the tyre, you will see that the water is actually channelled away.
The sipes help too
Sent from my iPhone using Tapatalk
K2-K6:
Think I'm using the wrong terminology ::) it's spindle torque acting on each tire that causes the most demanding conditions of longitudinal traction, which is opposite for rear wheel power torque and front brake applied torque.
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Similar as in above photo of wet race tire as they are fitted with opposed pattern orientation. Although it looks differnt, if the rear is accepted in it's "correct" direction, then the highest rotatational torque on the front wheel is applied in the opposite direction. It looks confusing as the bike is moving along but the tire is trying to resist just being pushed along the road under braking and under high demand gets into a percentage of slip at it's peak braking.
cliff7:
Does this mean my back tyre is more likely to skid in the wet when braking than the front? At the moment my back brake seems better than the front and I am sure I can brake quicker than I can accelerate.
Lobo:
...I’m gonna have to hang my head in shame and walk away from this one; I’m not sure how you can ‘forget the rotation’; if your garage told you this / “...the wheels only needed static balancingâ€, you’d raise your eyebrows. (no offence Steve!)
Nige... trying to make your explanation ‘fit’.... but alas I’m in a bloody mindset here.
Regardless... thanks gents,
Simon..... and quietly awaiting a Michelin Red Bulletin 😂😂😂)
(Interesting Ken, have been looking at such things - what brand is your system?)
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