L66TEY Posted March 1, 2021 Share Posted March 1, 2021 Hoping for assistance in understanding Avon tyre codes on my CR500's as I suspect they could be due a change...Fronts: 2914Rears: 4214I believe these to therefore be from week 29 and 42 in 2014 - is that right? Carry on regardless or get them changed? Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted March 1, 2021 Area Representative Share Posted March 1, 2021 Seems likely. I hope to wear tyres out much sooner that that Link to comment Share on other sites More sharing options...
SM25T Posted March 2, 2021 Share Posted March 2, 2021 Your understanding of manufacture date codes is correct. Link to comment Share on other sites More sharing options...
Hotfoot Posted March 2, 2021 Share Posted March 2, 2021 I believe tyres are considered new up to 5 years from the manufacturer date and can be sold by Tyre suppliers as new. Saying that I brought my 2015 car with only 1300miles on it and will probably be replacing the tyres as they feel a bit hard. If in doubt wear them out. Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 2, 2021 Share Posted March 2, 2021 I bin mine at 5 years old regardless of tread left. Link to comment Share on other sites More sharing options...
Obodiah Posted March 2, 2021 Share Posted March 2, 2021 I understand changing the tyres based on time if they have not worn out through driving but out of curiosity how many road miles would a set of typically ZZR's last ? Link to comment Share on other sites More sharing options...
Doctor Posted March 3, 2021 Share Posted March 3, 2021 The tyre's clock starts to run once driven and the factory protective coat has been broken. Only then you expose the rubber to the atmosphere/UV/oxygen/humidity. Link to comment Share on other sites More sharing options...
John Vine Posted March 3, 2021 Share Posted March 3, 2021 Re #7:That's interesting, I didn't know that.Although my car has worn ZZSs for some time now, the spare is an unused CR500 with a date code of 4209. It will only ever be a spare, but is it still OK to use if/when needed?JV Link to comment Share on other sites More sharing options...
7 wonders of the world Posted March 3, 2021 Share Posted March 3, 2021 Re #7Tyres don't have a protective coating - they come only with the releasing agent to prevent them sticking during the moulding process, this is naturally quite slippery hence the reason new tyres need to be scrubbed for the first 100 miles ishUV is the main killer - Link to comment Share on other sites More sharing options...
Leadership Team Toughie Posted March 3, 2021 Leadership Team Share Posted March 3, 2021 #8 John, I was in a similar situation when my front CR500 s had cracks in the side wall, but the rears were fine. I got in touch with Avon about replacing, but they had none in stock and were waiting before making the last batch of CR500. I asked about leaving the CR500 on the rear and putting ZZS on the front. Avon strongly recommended against it. Link to comment Share on other sites More sharing options...
John Vine Posted March 4, 2021 Share Posted March 4, 2021 Re #10:I asked about leaving the CR500 on the rear and putting ZZS on the front. Avon strongly recommended against it.Darren in CC Parts said the same. My CR500 spare is strictly a get-you-home measure. As soon as one pair of my ZZSs need replacing, I'll ditch the CR500 altogether and use one of the worn ZZS instead. JV Link to comment Share on other sites More sharing options...
Area Representative Geoff Brown Posted March 4, 2021 Area Representative Share Posted March 4, 2021 Bad idea having two different types of tyres as axle sets. They may all be Avon but relative size, compound & tread all play their part in making the car a potential handful due to the dynamics, light weight & short wheel base. Link to comment Share on other sites More sharing options...
L66TEY Posted March 16, 2021 Author Share Posted March 16, 2021 Thank you all for your feedback on this thread.I've decided to run the tyres for one more Trackday - Bedford April 26th - and will then get them changed to ZZS's all round after that. Many thanksChris Link to comment Share on other sites More sharing options...
Leadership Team Toughie Posted March 16, 2021 Leadership Team Share Posted March 16, 2021 When you do change them, just be aware that the ZZS is a bit more "Ballooney" than the CR500. When I first had new ZZS on I got a bit of some toe-rag's sticky snack paper stuck on the. I could hear it scrape on every revolution.You might have to do a little judicious 'persuading' if your present clearance is +/- 'only just'. Link to comment Share on other sites More sharing options...
John Vine Posted March 16, 2021 Share Posted March 16, 2021 ...the ZZS is a bit more "Ballooney" than the CR500.Clearly a technical term, but what exactly does it mean?JV Link to comment Share on other sites More sharing options...
Leadership Team Toughie Posted March 16, 2021 Leadership Team Share Posted March 16, 2021 Fatter. Link to comment Share on other sites More sharing options...
John Vine Posted March 16, 2021 Share Posted March 16, 2021 Certainly, if you mean profile.JV Link to comment Share on other sites More sharing options...
Grebby Posted March 16, 2021 Share Posted March 16, 2021 I'm currently sorting this on my car. I'm having to bend the wing stays a bit and reposition the cycle wings.JV - CR500s are a very square tyre. I.e. the sidewall is very flat with a fairly sharp corner to the tread The tyre guys commented on this when I was having the ZZSs fitted.. The ZZS sidewall bulges out a lot more. The larger tyre diameter combined with this bulge causes the sidewall to rubs on the cycle wings.Ballooney is just a way of saying bulgey outey sidewalley Damn it... Crossed posts and now you are using all technical terms. Link to comment Share on other sites More sharing options...
John Vine Posted March 16, 2021 Share Posted March 16, 2021 Re #18:Yes, I agree with all that. I had CR500s (195/45 R15) on my R400D from new, and replaced them with ZZSs (50 profile) a few years ago. Happily, I didn't have to bend the wingstays as the tyres just fitted.JV Link to comment Share on other sites More sharing options...
Leadership Team Toughie Posted March 16, 2021 Leadership Team Share Posted March 16, 2021 Exactly. Not just a higher profile, but also fatty sidewalls - hence the concise technical description by we tyre technologists as "Ballooney". Link to comment Share on other sites More sharing options...
John Vine Posted March 17, 2021 Share Posted March 17, 2021 JV Link to comment Share on other sites More sharing options...
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