littlebrownbike Posted June 28, 2009 Report Share Posted June 28, 2009 Is it true, that a tyres compound degrades / gets harder as it wears, if so why? I appreciate the blocks may move around less and have less flex, but I wouldn't expect a significant difference in the quality of the compound. Quote Link to comment Share on other sites More sharing options...
hms Posted June 28, 2009 Report Share Posted June 28, 2009 Heat from use? Perishing through age? These are the only things that I can think of that could affect a tyres rubber over time. h Quote Link to comment Share on other sites More sharing options...
89mustang Posted June 28, 2009 Report Share Posted June 28, 2009 Ultra violet degredation is also a factor. Look at the number of caravan tyre blowouts. Usually low mileage tyres but old, affected by prolonged exposure to sunlight. Quote Link to comment Share on other sites More sharing options...
littlebrownbike Posted June 28, 2009 Author Report Share Posted June 28, 2009 Sorry, I didn't mean the effects of wear and tear. My point was, is it true that as the tread depth reduces, the quality of the rubber decreases (and therefore gets harder, lasts longer). Â For example (assuming all factors remain the same, this is what I have been told); Â A tyre starts with 8mm, it does 5,000 miles and now has 4mm tread, having used 4mm. Â Now at 4mm, the same tyre does an additional 5,000 miles, but as the tread is now harder, it only wears half as much, resulting in 2mm tread. Quote Link to comment Share on other sites More sharing options...
CIH Posted June 29, 2009 Report Share Posted June 29, 2009 IIRC you can get tyres where the compound is different so wear charicteristics differ over the life of the tyre. Quote Link to comment Share on other sites More sharing options...
Tony Posted June 29, 2009 Report Share Posted June 29, 2009 The tyres silica goes off over time, this hardens the rubber and therefor increases the mileage, the downside is the compliance of the rubber allows the tyre to split plus the grip limits are seriously compromised. Quote Link to comment Share on other sites More sharing options...
Yaumeister Posted July 1, 2009 Report Share Posted July 1, 2009 The tyres silica goes off over time, this hardens the rubber and therefor increases the mileage, the downside is the compliance of the rubber allows the tyre to split plus the grip limits are seriously compromised. Â Am I correct in saying that tyres have "used by" dates? Like 5 years from manufacture? Quote Link to comment Share on other sites More sharing options...
dazz33 Posted July 1, 2009 Report Share Posted July 1, 2009 The tyres silica goes off over time, this hardens the rubber and therefor increases the mileage, the downside is the compliance of the rubber allows the tyre to split plus the grip limits are seriously compromised. Â Am I correct in saying that tyres have "used by" dates? Like 5 years from manufacture? Yeah i think you are right Mark...a kinda "best before date" Quote Link to comment Share on other sites More sharing options...
Tony Posted July 1, 2009 Report Share Posted July 1, 2009 The tyres silica goes off over time, this hardens the rubber and therefor increases the mileage, the downside is the compliance of the rubber allows the tyre to split plus the grip limits are seriously compromised. Â Am I correct in saying that tyres have "used by" dates? Like 5 years from manufacture? Â Legislation will soon have "best before selling dates" and "use by dates", there may also be a color change on the tyres sidewall to police this "use by date". Quote Link to comment Share on other sites More sharing options...
jon Posted July 3, 2009 Report Share Posted July 3, 2009 The current maximum recommend age is around 6 years. Quote Link to comment Share on other sites More sharing options...
hms Posted July 3, 2009 Report Share Posted July 3, 2009 This has probably been posted already. http://www.carbibles.com/tyre_bible.html h Quote Link to comment Share on other sites More sharing options...
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