John Vine Posted April 8, 2017 Share Posted April 8, 2017 At the moment I've CR500s (195/45 R15) all round on my R400D. I'm proposing to move to ZZS eventually, but right now only the rears need replacing.So, is it OK to have CR500 on the front and ZZS on the rear?JV Link to comment Share on other sites More sharing options...
JNC Posted April 8, 2017 Share Posted April 8, 2017 John why not do all ZZS front and back now and sell the CR500s fronts on here . Don't forget you may have to adjust the front wings as the ZZS will be a taller tyre . Link to comment Share on other sites More sharing options...
John Vine Posted April 8, 2017 Author Share Posted April 8, 2017 That's a thought, John. But I'm not sure how marketable my fronts would be. They're about 4mm, but suffering from the usual uneven wear caused by the neg camber. And if I don't sell them, I've wasted some serviceable tyres!So, back to my original question: is it OK to mix in this way? JV Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 8, 2017 Member Share Posted April 8, 2017 It's widely deprecated, but not as much as mixing at the same end.Even if you could practice with the effects on grip and slip angle on a track etc it still won't tell you what will happen when it's cold or wet or otherwise different...I'd follow JNC's plan.Jonathan Link to comment Share on other sites More sharing options...
John Vine Posted April 8, 2017 Author Share Posted April 8, 2017 Yes, the more I think about it, the more it looks like 4x ZZS. ETA: Just posted a Wanted ad, in case someone has a couple of CR500s lying about.JV Link to comment Share on other sites More sharing options...
John Vine Posted April 8, 2017 Author Share Posted April 8, 2017 According to my calculations, the diameter of the ZZS will be almost 20 mm more than the CR500, so I'll need at least 10 mm clearance under the cycle wing stays. I've just checked, and there's more than enough room under the stays, but the outer edge of the wing could end up perilously close to the tyre wall. The simplest solution might be to bend the stays up a little. Has anyone tried this in situ?JV Link to comment Share on other sites More sharing options...
JNC Posted April 8, 2017 Share Posted April 8, 2017 Be carful when bending the stays up are your wings bonded ? You may end up slightly twisting them and with vibration they crack . Link to comment Share on other sites More sharing options...
JNC Posted April 8, 2017 Share Posted April 8, 2017 Just had another thought Avon has a help line for Tec advice give them a call nothing to loose ! Link to comment Share on other sites More sharing options...
John Vine Posted April 8, 2017 Author Share Posted April 8, 2017 Yes, they're bonded. If I need to, I'll maybe just shave a little off the edge of the wings.JV Link to comment Share on other sites More sharing options...
dave_h34 Posted April 8, 2017 Share Posted April 8, 2017 Mine ended up very tight, but so far so good with clearance being adequate. My CR500s were 7 years old so might not be the best comparison but there is notably more grip with the ZZS which might need some caution. And of course, you'll need to adjust your ride height to get things corrected for the rear ZZSs, then again when you add the front ZZS. I bit the bullet and changed all four, but they were ~3mm ish and of course very old. Link to comment Share on other sites More sharing options...
sjmmarsh Posted April 9, 2017 Share Posted April 9, 2017 John. Are CC and BMTR not stocking these now? They were last year.Steve Link to comment Share on other sites More sharing options...
John Vine Posted April 9, 2017 Author Share Posted April 9, 2017 I sent Avon an email asking for advice. I'll post up what they say.JV Link to comment Share on other sites More sharing options...
John Vine Posted April 9, 2017 Author Share Posted April 9, 2017 CC have ZZSs in my size in stock. Or did you mean CR500s?JV Link to comment Share on other sites More sharing options...
Hampshire West AR Posted April 9, 2017 Share Posted April 9, 2017 Why don't you just buy CR500s, they are still available? Just stuck two rears on mine. Available from BMTR or Avon.Nick Link to comment Share on other sites More sharing options...
John Vine Posted April 9, 2017 Author Share Posted April 9, 2017 Well, yes, that was my original intention, but I couldn't find anyone stocking 15".I'll call Avon and BMTR tomorrow. Thanks for the pointer.JV Link to comment Share on other sites More sharing options...
sjmmarsh Posted April 9, 2017 Share Posted April 9, 2017 JVI meant CR500s. You can still get them. I got my last set from CC at the end of last year.Steve Link to comment Share on other sites More sharing options...
John Vine Posted April 10, 2017 Author Share Posted April 10, 2017 I've just spoken to Tony in Parts, who told me that the "last ever" delivery of CR500s is due in this week.So, I've ordered two. Problem solved. Thanks for all your help, chaps.JV Link to comment Share on other sites More sharing options...
TomB Posted April 10, 2017 Share Posted April 10, 2017 Thats disappointing I thought CR500 where being kept in production for the foreseeable future. Ive fitted the 205 rears my older de-dion and clearances are tight. I don't want to go up to 215 rears, and I really like the nimbleness of the car on the lighter, lower profile tyres. Unfortunately, I don't need any at the moment, and the wallet is weak! Link to comment Share on other sites More sharing options...
John Vine Posted April 10, 2017 Author Share Posted April 10, 2017 The Avon Motorsport site states:"The CR500 is being replaced by the ZZS as OE on Caterhams, however Avon Motorsport will still continue to manufacture the CR500 in limitied quanities for the foreseeable future. We would recommend changing over to the ZZS where possible. "There's no mention of what sizes that includes, however.JV Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted April 10, 2017 Leadership Team Share Posted April 10, 2017 Is the ZZS really a suitable replacement for the CR500 as a general all-round tyre? According to Avon's own information the wet performance of the ZZS is substantially less than the CR500 (and evidently not dissimilar to the ZZR), not damp road performance but proper rain. Having aquaplaned badly in a Caterham I'd prefer a tyre that can shift plenty of water ...http://www.avonmotorsport.com/sites/default/files/CR500-TW1020_EU.jpg http://www.avonmotorsport.com/sites/default/files/ZZS-BC1028-EU-2.jpg http://www.avonmotorsport.com/sites/default/files/ZZR-BC1026-EU-2.jpg Link to comment Share on other sites More sharing options...
Area Representative paul richards Posted April 10, 2017 Area Representative Share Posted April 10, 2017 StuartI note your comments, but I've just bought a set of ZZS's to replace my CR500s, but not yet fitted them, so can't comment fully yet. My decision was made based on the practical experience of seeing ZZS tyres used by the Caterhams at the Race of Remembrance in absolutely horrendous conditions when track was extremely wet and they performed well. I'll hope they perform just as well on the road. Link to comment Share on other sites More sharing options...
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