Tyres again sorry

[Doctor T]

where do you find out what the codes M, C, O, etc mean?. All i can find is from Cambrian Tyre's



"[size=16px]The final piece of information is the tyre’s name and model. Using the picture above this would be Bridgestone’s “Battlax S20” with a letter “F” after it. The “F” denotes the tyre is a front tyre, whereas an “R” would denote a rear fitment. On occasion manufacturers also make model specific original equipment tyres, and in this case, a different letter may be used to signify that it is a special or specific tyre".[/size]

[David.]

The version codes mean that a particular tyre has been developed by the tyre manufacturer and approved/recommended for use by the motorcycle manufacturer for a specific model.

As an example, if using a Z8, the Metzeler fitment guide recommends front (M) and rear (O).

[simbo]

Speed rating 'ZR'.. Weight rating Front '58W'.. Rear '73W'.. All the rest is just Hotpoint recommends Persil and 8 out of 10 Cats prefer Whiskers.

[Doctor T]

Found that "E" & "O" means original equipment. Then there is "E" which means it's up to European standard. The others are just a code for the manufacturer or as Simbo says what washing temperature.

[Have i bought a money pit]

Only ebay for £185 a pair. 6 months ago i paid £240. What comes to mind id they are fazing out the standard one and now only the SE versions. Hence the price drop some are passing on.

I had a pair of Metzeler Roadtec 01 SE's. Good tyres, but only lasted me approx 4500 miles.

[David.]

Interesting that the only photos I've seen of this type of tyre wear is with Metzeler Z6's, Z8's and now 01's. They seem to break up in the centre and go down to the cords without much warning.

Z6


Z8


01

[Have i bought a money pit]

I was shocked! I'm no Mick Doohan. But would the heavyweight ones make a difference.....?

[David.]

I used the correct recommended rear [C] version code Z6 but still experienced them breaking up in the centre and on one occasion, down to the cords.

[David.]

But would the heavyweight ones make a difference.

From what I can see, the HWM rear tyre has a 2 ply carcass to increase stability. The standard tyres only have 1 ply. Both appear to have the same dual compound rubber which presumably dictates how the tyre wears. If this is the case, the tyres might wear the same but give a different feel to the ride.

[David.]

http://www.cambriantyres.co.uk/wp-content/uploads/2021/10/10000000_253469976663261_7778191377401602459_n.mp4

This video is how an Avon tyre is manufactured. The carcass (plies) being built before the tread is fitted. If this is the same for all tyres, then it shows that the carcass construction and the tread are separate parts bonded together. When the tyre starts to break up in the centre, it's likely to be the bond between the carcass and tread de-laminating before showing the cords of the ply.