Are my tyres still healthy? - MVAgusta.net
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 06-16-2010, 05:44 AM Thread Starter
Senior Member
 
Join Date: Jan 2010
Posts: 250
Are my tyres still healthy?

Hello all,
Well I had not thought about this until the other day when, well, it
felt like I had run out of grip and slid a bit. Sure I was pushing just a little, but...

My question is this : My bike has just 2500km's from new and the
tyres still have plenty of life in them.

BUT ! : I bought this 312 'new' old stock, so the tyres have been on the bike in the showroom for perhaps 2 years or so...

Would they have gone 'off' and thus the slide or lack of grip?

Should they be changed after this amount of time irrespective of
klm's travelled?

Thanks,
Matt

Currently : mv1000f4 312r, Ducati 750ss (95),and previously...gsxr600 k1, yzf1000r, ducati 900ss, ducati 600m, yzf750r, cbr600f, xt600, gpz900r, nsr250sp, kr1,
cagiva mito 125 (lawson replica), rg250, z250, cb350 (Four)...and counting...
mvmatty is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 06-16-2010, 06:23 AM
Senior Member
 
emmevi125s's Avatar
 
Join Date: Sep 2006
Location: Melbourne, Australia
Posts: 1,762
A friend had a crash earlier this year on brand new tyres and couldn't figure out why (he was a competent rider who has had a wildcard entry into the WSB a few years ago). On investigation he came up with the following.

Tyres have a manufacture date on them and an unofficial use by date. An internet search will reveal that m/c tyres has less than 1/2 it's grip after 4 years and should never be used after 6 years.

The manufacture date is:
look for the letters 'DOT', then look for a number series at the end. The first two digits indicate the week of the year the tyre was manufactured and the last two indicate the year.

for the sample below the tyre was made in the 27th week of 2007
Attached Images
 
emmevi125s is offline  
post #3 of 11 (permalink) Old 06-16-2010, 06:29 AM
CAG
Senior Member
 
CAG's Avatar
 
Join Date: Dec 2006
Location: Home. In Dixie.
Posts: 13,695
Send a message via Skype™ to CAG
Good answer.
CAG is offline  
post #4 of 11 (permalink) Old 06-16-2010, 06:35 AM
Senior Member
 
Turbo329's Avatar
 
Join Date: May 2006
Location: Upstate, NY USA
Posts: 1,325
Emmevi beat me to it.

It's likely the tires are old and need to be replaced for optimum grip.

2005 MV F4-1000S
Turbo329 is offline  
post #5 of 11 (permalink) Old 06-16-2010, 12:54 PM
Senior Member
 
svldvc's Avatar
 
Join Date: Sep 2009
Location: State College, PA
Posts: 655
Wow thank you guys for these posts.

I never knew that...

~Serge~
svldvc is offline  
post #6 of 11 (permalink) Old 06-16-2010, 01:29 PM
Senior Member
 
oldnfast's Avatar
 
Join Date: Apr 2010
Location: Londoner at large in Spain
Posts: 589
Rubber, a major component of tyres looses about 15% of its properties every year. Therefore a tyre, without moving an inch, is 45% less effective in respect of the rubber content after three years.
Not sure how ageing affects the synthetic and other additives in a modern tyre, but the above is worth thinking about.
Hot/cold cycles are said to be not important in a modern road tyre.
oldnfast is offline  
post #7 of 11 (permalink) Old 06-16-2010, 11:06 PM
Senior Member
 
Cash_Dawg's Avatar
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,149
Quote:
Originally Posted by emmevi125s View Post

Tyres have a manufacture date on them and an unofficial use by date. An internet search will reveal that m/c tyres has less than 1/2 it's grip after 4 years and should never be used after 6 years.

The manufacture date is:
look for the letters 'DOT', then look for a number series at the end. The first two digits indicate the week of the year the tyre was manufactured and the last two indicate the year.

for the sample below the tyre was made in the 27th week of 2007

Great post/info... Thanks
Although I knew tyres degrade over time with out even being used, I did not know the annual rate of this degradation is around 15%...
I'm sure this info will be handy to a lot of us. Especially those with multiple bikes that don't do many Km's/miles per year.

Thanks again.

_________________
A closed mouth gathers no feet.........
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Cash_Dawg is offline  
post #8 of 11 (permalink) Old 06-17-2010, 01:03 AM
Senior Member
 
Stegen's Avatar
 
Join Date: Dec 2007
Location: La Crosse, Wi
Posts: 705
Well hell. I just put 3 year old tires on my bike that came with the bike stock but were changed out with 600 miles on them. Now im gonna be worried every time i ride. but i am slower than shit so i shouldnt have any problem.
Stegen is offline  
post #9 of 11 (permalink) Old 06-17-2010, 04:24 AM
Established Member
 
Join Date: May 2010
Posts: 163
Last time I changed tires was during the Pilot Power 2CT front tire recall. When was that again?
MV Guy 12345 is offline  
post #10 of 11 (permalink) Old 06-17-2010, 05:02 AM
New Member
 
Join Date: Jul 2005
Location: Hobart, Tasmania
Posts: 70
I've found that a more track biased tyre "went off" before I considered it worn out. The tyres were Pirelli Super Corsa's and by the time they were half worn they were becoming hard to get heat into and basically didn't offer anywhere near the same grip as when they were new. I've heard that the track focussed tyres can't handle too many heating and cooling cycles, so maybe that was part of the problem. Since then I've run 50/50 road/track tyres which have provided consistent grip to the end of their service life.
Aussief4s is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to use all of the features of the MVAgusta.net site, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome