Sean SuperlightR Posted March 3, 2003 Share Posted March 3, 2003 Quite a simple question really, I drive a 1.6 K series supersport on 13" with CR500's. On dry track days, like Donington yesterday, I want to try some harder tyres and am thinking about the ACB10's. Any views? More specifically, any suggestions as to how to quicky heat up such tyres and what sort of pressures should ACB10's run at? Finally, any ideas on sizes for the rears? Thought about going to 7.5J or 8J on the back but think this might over tyre the car and upset the balance. I'll keep a set of CR500's 175 for when it's damp. The car is a six speed with 133bhp. Anyone else at Donny yesterday? What a day! Link to comment Share on other sites More sharing options...
rgrigsby Posted March 3, 2003 Share Posted March 3, 2003 Sean I'd probably stick with 6x13-21 ACB10's all round, in the standard Caterham compound that'll give you plenty of grip and hopefully a fairly nice balance. You could run 7" ones at the rear but I don't think you really need to. In terms of pressures it takes a bit of playing to work out what suits your car but on track I would guess cold pressures will be 15-16psi front and rear. I'd start there and then change the pressures up or down a few PSI to suit your car/driving style. At this time of year it's very very difficult to get Caterham compound ACB10's hot at all, so you may find they aren't that grippy. Cheers Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Sean SuperlightR Posted March 3, 2003 Author Share Posted March 3, 2003 Thanks Rob, that's a big help. I'll give the ACB10's a try this year when the weather picks up and they can be warmed up. Sean. Link to comment Share on other sites More sharing options...
westy Posted March 3, 2003 Share Posted March 3, 2003 Aren't ACB10 softer than CR500s? Link to comment Share on other sites More sharing options...
Sean SuperlightR Posted March 3, 2003 Author Share Posted March 3, 2003 I don't profess to be an expert on rubber! But I think ACB10's are a harder compound than CR500's. That's one of the reasons why they need to be hot to work properly (I think). It also explains why CR500's don't last too long if used for dry track days. If anyone is more clued up about tyres than me (which is just about everyone) then please feel free to tell me I've got this completely wrong. Sean. Link to comment Share on other sites More sharing options...
rgrigsby Posted March 3, 2003 Share Posted March 3, 2003 Westy it depends which compound ACB10 you buy, the Caterham compound ACB10's are actually fairly hard (relatively speaking). I'm fairly sure CR500's are a softer compound than the Caterham ACB10's.... willing to be proved wrong though... Cheers Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Peter Carmichael Posted March 3, 2003 Share Posted March 3, 2003 CR500s run narrow tread blocks which tend to fall over instead of stay put and grip the road. The ACB10 tread blocks are big fat ones that grip better inherently. If you look at an ACB10 tread block, it gets feathered on the outside edge. This is exactly what happens with a narrower tread block only the proportion of "edge" to "working surface" is much inferior. Whether the tread compound is softer or not is a secondary consideration. An ACB10 with a softer compound will show better wear characteristics in dry use that CR500s. I have never had any big concerns about running ACB10s on the road apart from with standing water, but I have gravitated towards using medium road-going compound (A30) rather than Caterham compound (A33 hard). Original Superlight spec was A30 before the Roadsports race series started using A33 ACB10s and thereafter all Superlights became A33. Link to comment Share on other sites More sharing options...
Michael Posted March 3, 2003 Share Posted March 3, 2003 I thought ACB10s were F/Ford wets ! Link to comment Share on other sites More sharing options...
Fred Posted March 3, 2003 Share Posted March 3, 2003 Generally ACB10's are available in A33 (Hard compound sold by Caterham) through A30 to A24 compound. The definitions from Avon are: A33 Stronger for very hard saloon use A31 Durable compound mostly used on saloon cars A30 Generates higher temperature and grip than A31 A24 Used in medium single seater/soft saloon applications They are not available in A40 compound due to their inability to pass the Load Rating test Here's a list of compounds and how to identify them on ACB10's. These figures are current and the Spec is a 4or 5 digit number on one side of the tyre carcass. Code Tyre Size Compound Load rating width/dia rim size 6356 6.0/21.0-13 A30 76V 6357 7.0/22.0-13 A31 85V 6363 6.0/21.0-13 A24 76V 6364 7.0/22.0-13 A24 85V 6509 7.0/22.0-15 A31 78V 6510 7.0/22.0-15 A24 78V 6587 8.0/22.0-15 A31 80V 6894 7.0/21.0-13 A24 78V 6895 8.0/22.0-13 A24 89V 6898 7.0/21.0-13 A30 78V 6899 8.0/22.0-13 A31 89V 7319 7.0/22.0-13 A31 7404 6.0/21.0-13 A33 76V 7501 7.0/22.0-13 A33 85V 7713 7.0/22.0-15 A33 78V 8813 7.0/22.0-15 A33 78V 8843 7.0/21.0-13 A30 8844 8.0/22.0-13 A31 9064 6.0/21.0-13 A33 76V 9065 7.0/21.0-13 A33 78V 10014 8.0/22.0-15 A24 80V 10035 7.0/21.0-13 A33 78V 10036 8.0/22.0-13 A33 89V 10090 7.0/22.0-15 A33 78V 11005 7.0/22.0-15 4S60 78V 11099 6.0/21.0-13 A29 76V 11110 6.0/21.0-13 A29 76V Link to comment Share on other sites More sharing options...
Tight fart Posted March 3, 2003 Share Posted March 3, 2003 And where is the cheapest place to get them ? Link to comment Share on other sites More sharing options...
Paul McKenzie Posted March 3, 2003 Share Posted March 3, 2003 2nd hand from FF racing teams, or BMTR if you're rch Paul Link to comment Share on other sites More sharing options...
Paul Bowden Posted March 3, 2003 Share Posted March 3, 2003 Do you have to change suspension geometry to use ACB10's which I believe are a crossply tyre. Caterham say you need to change the Di-dion ears to use them. Do you need to do this or is this just the optimum. Link to comment Share on other sites More sharing options...
robmar Posted March 4, 2003 Share Posted March 4, 2003 yep you should I am lead to believe change the geomoetry to suit however I believe Powder Puff has the radila setup and still won class 3 in the club sprints on acb10's last year rob Link to comment Share on other sites More sharing options...
Powderpuff Posted March 4, 2003 Share Posted March 4, 2003 Yup Link to comment Share on other sites More sharing options...
Peter Carmichael Posted March 4, 2003 Share Posted March 4, 2003 ACB10s were originally Formula Ford intermediates, which means they are a moulded slick. With the appropriate E-mark some variations are road legal. They are nothing like a race wet. Link to comment Share on other sites More sharing options...
V7 SLR Posted March 4, 2003 Share Posted March 4, 2003 Hoping I won't regret this.... I contacted Avon racing earlier. Brian said he'd be agreeable to a bulk purchase of any mixture of Avon tyres, ACB10/CR500, and size and compound. I admit I was pleasantly surprised by the pricing of a set of CR500s for the SLR (£76.50 front and £86.50 rear, all plus VAT). I thought they would be the same as the ACB10s. Brian said the new compound CR500 was really good too, confirming what Alex Wong recently told me (he has them). That isn't the bulk purchase price. I don't have one yet. So, anyone interested? If so, email me direct with type, size and compound (ACB10 only) requirements. Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
Powderpuff Posted March 4, 2003 Share Posted March 4, 2003 You are going to regret this Nigel!!!! *smile* Mail on it's way offline...... 😬 Link to comment Share on other sites More sharing options...
Tight fart Posted March 4, 2003 Share Posted March 4, 2003 V7slr, YHM Link to comment Share on other sites More sharing options...
V7 SLR Posted March 4, 2003 Share Posted March 4, 2003 Blimey. What a response...!!! Should add that we'll be collectively responsible for delivering them around to people. The carriage is a one-off payment, therefore it'll be a one-off destination. I'm not going to repost them so we'll have to come to some arrangement for collection etc... We'll work it out. Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
martinwhitcher Posted March 4, 2003 Share Posted March 4, 2003 Well what prices are we looking at?? Martin MW 51 CAT Link to comment Share on other sites More sharing options...
V7 SLR Posted March 5, 2003 Share Posted March 5, 2003 Bloody hell Martin, give me a break. I'm looking into it. Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
rgrigsby Posted March 5, 2003 Share Posted March 5, 2003 Is your mailbox filling up Nigel? 😬 Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
V7 SLR Posted March 5, 2003 Share Posted March 5, 2003 62 tyres to date. I'm waiting on some "compound" info from a couple of people and then I'll place the call. Should know later today. Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
V7 SLR Posted March 5, 2003 Share Posted March 5, 2003 Where am I going to put them? Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
Tight fart Posted March 5, 2003 Share Posted March 5, 2003 If your stuck I could possibly take them at work and then send them out via our carriers, have you the weight of 4 tyres? and I will get a price. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now