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Thread: CR500 to ZZS

  1. #1
    Join Date
    Apr 2013
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    Default CR500 to ZZS

    My CR500 tires are aged out and I need to replace them on my 7 SV. My car has 195/45-15 CR500 and the ZZS that has superseded them is available in a 195/50-15. My issue is clearance. I knew one of my cycle wings is very close to the tire (about 4mm) but when I was looking at the options to fix that I noticed my cycle wing stay is also very close to the tire. The wing I could shim but the stay is a trickier issue. Out of curiosity I looked at Caterham parts and note that they list certain stays as being for use with the ZZS/ZZR tires. So they must have made a slight change to account for the wheel diameter change (from 21.69 to 23.08 per Avon website). Has anyone made the switch between the tires and did you have clearance issues?

    I did a feeble attempt to flex the stay with the cycle wing still on to see if it would bend but it seemed fairly stiff. If that does not work I would likely heat it and try to bend it and I could buy new stays if i bugger them up as they are not too expensive.

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    Last edited by Black Hole; 02-05-2020 at 10:52 PM.
    Jay

  2. #2
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    May 2018
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    Default

    The wingstays and fenders "float" with the tire.

    As long as there is any clearance at all, it shouldn't be an issue. Like motorcycle front and rear fenders which float with the suspension.

    I switched from Avon and while I'm not happy with the sizes they worked for now

    Sent from my Pixel 3a XL using Tapatalk
    2001 Caterham Superlight R

  3. #3
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    Feb 2009
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    Default

    I use Avon ZZS on my silver CSR in 15 inch wheel size and they originally were on CR500. Just bolted on with no clearance issues. Not much help as it is a CSR not a SV. I also have the ZZS on 13 inch wheels on my 420R but as that was from the beginning I suspect it had the special stays you refer to from original build.
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration finished - track set up time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore SS Group A (suspension restoration)
    1985 Holden Commodore Group A (suspension set up)
    1982 Ferrari 400i (radiator replacement)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (dyno time)
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    and another project car coming....

  4. #4
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    Default

    Quote Originally Posted by Vovchandr View Post
    The wingstays and fenders "float" with the tire.

    As long as there is any clearance at all, it shouldn't be an issue.
    Thank, I know they move with the tire and that is why the clearance with the CR500 is tight but not an issue. The wild card is when I go to the larger tire I may run out of clearance
    Jay

  5. #5
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    Quote Originally Posted by Croc View Post
    I use Avon ZZS on my silver CSR in 15 inch wheel size and they originally were on CR500. Just bolted on with no clearance issues.
    Hopefully I will have the same experience. I will likely order them in the next week or two from Roger Krause. I will get them to fit somehow, just a matter of bolt on or have to make some modifications.
    Jay

  6. #6
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    And for the best bit of news, I think they are better than the CR500 being replaced
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration finished - track set up time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore SS Group A (suspension restoration)
    1985 Holden Commodore Group A (suspension set up)
    1982 Ferrari 400i (radiator replacement)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (dyno time)
    1990 Range Rover 2 door Classic
    and another project car coming....

  7. #7
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    The other wild card, I have discovered, is that with very minimal tire/fender clearance, wind pressure at high speeds will shove the fender onto the tire and cause significant rubbing. My efforts at bending the stays were minimally successful. I had more luck with imaginative shimming (as long as aesthetics aren't a concern, and on my Cat, they are not). Even then, I have trouble fitting a 13x185/60 on the front.
    Kitcat:AKA, Sir Spinsalot
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car
    '19 Honda Type R, sold
    '19 Miata Clubsport

  8. #8
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    My new tires are 185/60r13 that are picturer above with the tight fit.

    The previous original R500 had a much more tollerant fit. Don't remember their size. But ill trying to order the same matching set as original again.

    Rears are a bigger problem. 245s are being very hard to find for the rear. And the current side wall at 45 makes them look very small in the arches and definitely much small than the 60 front.
    2001 Caterham Superlight R

  9. #9
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    I thought the CSR used 245 rears, but the S3/SV used 215? Does that significant difference in front & rear width result in a lot of understeer?

    -John
    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

  10. #10
    Join Date
    Jul 2013
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    499

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    You might also think about trimming off some of the excess bolt length. I did so, not for the tires, but for using tire bonnets (straps) which caught on the bolts, between the tire and fender.

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