Tire Cupping

[Stig / Major Tom]

IMHO - "Tire Cupping" of motorcycle and scooter tires is THE most entertaining subject of two wheel riding discussion. (even better than the "synthetic oil",  or "break-in" discussions!!)

Veteran riders, shade tree mechanics, young, old, dealer mechanics....everyone knows what causes tire cupping on motorcycles and scooters.

Cupping is caused by :

Normal Tires cup & are worn out at 3000 miles...if you have 3000 miles on your bike - come see us!

Front cupping is caused by worn fork seals
Old fork oil
Wrong springs
Worn springs
Loose head bearings
Worn head bearings
Misaligned wheel
Bent fork
Bent frame
Wrong tires
Cheap tires
Old tires
Fast riding
Bad roads
Over-inflation
Under-inflation
Over weight rider
And they will try to kill you, in the wet, the dry, on cold or hot surfaces.

Cupped rear tires are caused by:
Most of the above, and...
Big horse power
Bad shocks
Cheap shocks ("buy ours !")
Good, but worn shocks ("buy ours !")
Over-loaded cases
Trailer pulling
Wrong top case
And they will try to kill you, in the wet, the dry, on cold or hot surfaces.


Reading & listening to all of the above, the only thing that is clear to me is that neither the Soviets nor aliens are causing cupped scooter tires. Probably.

Oh yes, there was one guy who said cupping is normal tire wear on a two wheeler.




But, this is so much fun - because everyone knows what causes cupping - but me.
 
Stig

[CROSSBOLT]

Front tire cupping is caused by the Moon phases. Rear tire cupping is caused by oscillation of Jupiter. Especially bad in Leap Years.....silly, everyone knows that! Where have YOU been!

Karl

[Forbes1964]

Front tire cupping is caused by the Moon phases. Rear tire cupping is caused by oscillation of Jupiter. Especially bad in Leap Years.....silly, everyone knows that! Where have YOU been!

Karl

So, that would explain why on the same two wheeler the present set of tires may cup, but the next set or previous set didn't or won't.

Now kind sir. Can you tell me at what phase of the moon should I avoid riding? And given that this is a leap year, Is my rear tire doomed.? [emoji23][emoji23][emoji23]


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[gn2]

It depends on the day the tyre is fitted rather than when its ridden.
Always look for a tyre fitter with the correct astrological wall chart which knows when to fit tyres.
If you are in any doubt regarding the tyres on your scooter you should always take them in and get their psychic aura read.

[Stig / Major Tom]

So, Is my rear tire doomed.? [emoji23][emoji23][emoji23]
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If you are still able to read this:
Step  a w a y  from the scooter - dear man turn and run like you've never run before!
A wrong-mooned tire install is more dangerous than scalloped potatoes. !

It may be too late, Karl.
We can divvy up his tools between us..... and any usable parts after the tire explosion.

What color was his scooter?
Stig