CR500 vs. ACB10 ??
Discussion
Hi Guys,
asking this in here as most of your guys will have experience on CR500 tyres, and some back to back with ACB10s ??
I'm interested in track performance only - and am aware of the camber changes req'd between the two..
paddock talk woudl suggest the ACB10 is worth "a second a lap" compared with a CR500, but woudl love to hear from anyone who have done proper tests on both and optimised their set up...
anyone have specific info to share ???
Mark.
asking this in here as most of your guys will have experience on CR500 tyres, and some back to back with ACB10s ??
I'm interested in track performance only - and am aware of the camber changes req'd between the two..
paddock talk woudl suggest the ACB10 is worth "a second a lap" compared with a CR500, but woudl love to hear from anyone who have done proper tests on both and optimised their set up...
anyone have specific info to share ???
Mark.
gixermark said:
Hi Guys,
asking this in here as most of your guys will have experience on CR500 tyres, and some back to back with ACB10s ??
I'm interested in track performance only - and am aware of the camber changes req'd between the two..
paddock talk woudl suggest the ACB10 is worth "a second a lap" compared with a CR500, but woudl love to hear from anyone who have done proper tests on both and optimised their set up...
anyone have specific info to share ???
Mark.
Ditch them both and go with Kunho ecsta's in medium compound. Tried them both last year ended up going back to kumho's, blackpool tyres do a full set for around 300 quid, new ACB' will be about 550-600, if you do decide for the ACBs i can give you two 245/45/13 for the price of postage, they have only been out twice. Infact you can have some part worn 215/45 13's for the front ex FF, if you want to try them out. asking this in here as most of your guys will have experience on CR500 tyres, and some back to back with ACB10s ??
I'm interested in track performance only - and am aware of the camber changes req'd between the two..
paddock talk woudl suggest the ACB10 is worth "a second a lap" compared with a CR500, but woudl love to hear from anyone who have done proper tests on both and optimised their set up...
anyone have specific info to share ???
Mark.
Honestly though, Kumhos are the business
I've about 18K miles experience on ACB10s and about 7K miles on CR500s on an ever-increasingly, powerful Caterham SLR.
Although the CR500s are a radial, you can use them on the ACB10 camber settings very successfully. If you want to keep swapping from one to the other, set the car up for ACB10s and leave it.
On track there is no competition. The ACB10 offers both sharper response owing to the stiff crossply construction, and more rubber in contact with the track. CR500s can overheat depending on the conditions of the day.
I fancied a change for road use and switched to CR500s. They are very nearly as light as the ACB10 (which uses a fibreglass crossply) and felt much sharper than Yokos (as though the sidewalls didn't slop as you turned in) and of course didn't tramline like the ACB10s but whenever I buy my next Se7en, I shall almost certainly go back to ACB10s, even for road use. I will learn to live with the tramlining, and maybe work on the suspension set-up a bit more to minimise it. Essentially they make your car perform SO much better, even in the wet.
Although the CR500s are a radial, you can use them on the ACB10 camber settings very successfully. If you want to keep swapping from one to the other, set the car up for ACB10s and leave it.
On track there is no competition. The ACB10 offers both sharper response owing to the stiff crossply construction, and more rubber in contact with the track. CR500s can overheat depending on the conditions of the day.
I fancied a change for road use and switched to CR500s. They are very nearly as light as the ACB10 (which uses a fibreglass crossply) and felt much sharper than Yokos (as though the sidewalls didn't slop as you turned in) and of course didn't tramline like the ACB10s but whenever I buy my next Se7en, I shall almost certainly go back to ACB10s, even for road use. I will learn to live with the tramlining, and maybe work on the suspension set-up a bit more to minimise it. Essentially they make your car perform SO much better, even in the wet.
Never had a problem with Yokos personally. Though they are heavier (double so when you consider your wallet is less light after purchase).
CR500s are OK, but not sure they're worth the extra.
ACB10s for dry weather only. Or the tighter of sphincter than me.
If you drive to the track, then I'm sure ACB10s must be better on balance. If you don't drive to the track, fit slicks.
CR500s are OK, but not sure they're worth the extra.
ACB10s for dry weather only. Or the tighter of sphincter than me.
If you drive to the track, then I'm sure ACB10s must be better on balance. If you don't drive to the track, fit slicks.
Murph7355 said:
Never had a problem with Yokos personally. Though they are heavier (double so when you consider your wallet is less light after purchase).
CR500s are OK, but not sure they're worth the extra.
ACB10s for dry weather only. Or the tighter of sphincter than me.
If you drive to the track, then I'm sure ACB10s must be better on balance. If you don't drive to the track, fit slicks.
It's not about "having a problem" with Yokos as such because I agree wholeheartedly that they are wonderful tyres without which the world would be a poorer place... but on a well-prepped Caterham they feel heavier and the car moves about more on them. Their sidewalls are not nearly as tightly controlled as the Avons.CR500s are OK, but not sure they're worth the extra.
ACB10s for dry weather only. Or the tighter of sphincter than me.
If you drive to the track, then I'm sure ACB10s must be better on balance. If you don't drive to the track, fit slicks.
Given that a Yoko was about 80 quid and the equivalent CR500 about 105 quid, I went with the Avon, and I know people who have experience of both wearing quicker than the other.
ACB10s are absolutely spectacular in the wet. You just have to get them warm. My car was setup for ACB10s and they worked so brilliantly. They were designed as formula ford wets originally (so I am led to believe) and as such I think they are fabulous. From cold I will agree that care and attention is due but I recall pulling into a petrol station in Ireland whilst on tour with some other nutters IN THE RAIN. By the time I'd finished filling up and went to pay, my tyres were perfectly dry again. You just have to work them.
On an Elise, or some historic Lotus (I still hanker after an Elan +2) I would probably opt for Yokos every time.
Mars, when you get round to getting your hands on your next Caterham, I would strongly suggest you try out the Kumho's before jumping back into bed with ACB10's again. The top classes in the Seven sprint / hillclimb championship uses them to good effect, they are even faster than the A24 soft compound ACB's with the added advantage of being about half the price at around the £325 mark a set.
Fitted a set to my 257bhp R400 just before I sold it, had to demo it to the guy who bought it in the wet, could not believe how fantastic they were compared to the CR500 with no wheelspin once warm in second gear on the straight bits!
Just bought a set to go on my soon to be road legal Busa, which on a cold day could wheelspin A24 ACB10's in fourth gear in the dry so hoping they work as well with this lighter car.
Fitted a set to my 257bhp R400 just before I sold it, had to demo it to the guy who bought it in the wet, could not believe how fantastic they were compared to the CR500 with no wheelspin once warm in second gear on the straight bits!
Just bought a set to go on my soon to be road legal Busa, which on a cold day could wheelspin A24 ACB10's in fourth gear in the dry so hoping they work as well with this lighter car.
Darren Hi
What size and compound are you going for on the busa?
I was thinking of going to acbs as my track tyres on the blackbird but might try the kumho's but don't want then to get overheated after 2 laps.(I assume the sprinters use a very soft compound that wouldn't work for trackdays but I am guessing)
I am happier with soft tyres as I would rather they are worn out in 2000 miles than last forever if you see what I mean.
Will
What size and compound are you going for on the busa?
I was thinking of going to acbs as my track tyres on the blackbird but might try the kumho's but don't want then to get overheated after 2 laps.(I assume the sprinters use a very soft compound that wouldn't work for trackdays but I am guessing)
I am happier with soft tyres as I would rather they are worn out in 2000 miles than last forever if you see what I mean.
Will
Hi Will,
I have gone for the bigger sizes (235mm rears / 215mm front) to help fill out the wide wings I have on my car, as I ran 7.5in wheels front & 10" rears for the Hillclimb slicks I have been using for competition.
For road use I am going with the softest compound, but for track days I believe the medium is the one to go for (but no personal experience!) Ask on blatchat to confirm.
I have gone for the bigger sizes (235mm rears / 215mm front) to help fill out the wide wings I have on my car, as I ran 7.5in wheels front & 10" rears for the Hillclimb slicks I have been using for competition.
For road use I am going with the softest compound, but for track days I believe the medium is the one to go for (but no personal experience!) Ask on blatchat to confirm.
I was always a big fan of my ACB10s on both road and track. I used CR500s to some degree on the road to save the ACB10s (both expensive, but the CR500s last longer!).
I never got on with A032s associating them with snap oversteer.
Sounds like Kumhos have good qualities if they are sticky like the ACB10, but cheaper.
I always wanted to find a source of used ACB10s from FF racing, but never managed it.
Bert
I never got on with A032s associating them with snap oversteer.
Sounds like Kumhos have good qualities if they are sticky like the ACB10, but cheaper.
I always wanted to find a source of used ACB10s from FF racing, but never managed it.
Bert
dsl2 said:
Mars, when you get round to getting your hands on your next Caterham, I would strongly suggest you try out the Kumho's before jumping back into bed with ACB10's again. The top classes in the Seven sprint / hillclimb championship uses them to good effect, they are even faster than the A24 soft compound ACB's with the added advantage of being about half the price at around the £325 mark a set.
Fitted a set to my 257bhp R400 just before I sold it, had to demo it to the guy who bought it in the wet, could not believe how fantastic they were compared to the CR500 with no wheelspin once warm in second gear on the straight bits!
Just bought a set to go on my soon to be road legal Busa, which on a cold day could wheelspin A24 ACB10's in fourth gear in the dry so hoping they work as well with this lighter car.
One of the Swedish fellows had them on his car for our Scandinavian tour a few years ago. He swore by them but he had the wrong sizes on (to my eyes), they were far too wide for his rims.Fitted a set to my 257bhp R400 just before I sold it, had to demo it to the guy who bought it in the wet, could not believe how fantastic they were compared to the CR500 with no wheelspin once warm in second gear on the straight bits!
Just bought a set to go on my soon to be road legal Busa, which on a cold day could wheelspin A24 ACB10's in fourth gear in the dry so hoping they work as well with this lighter car.
They were definitely interesting with an "old world" tread pattern.
Where can you buy suitably-sized ones for an SLR-wheeled Se7en? I'll have a look at them.
Hi,
Can someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
Can someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
Fergus,
They are the Kumho Ecsta V70a in soft/med/hard compounds, sidewalls very stiff & could be an arse to get fitted to rims without damage, but no worry's if you use a proper skilled firm to do it! (BMTR for instance in Birmingham are v good)
Only really used mine in the wet, they were superb & not snappy with 257bhp (two people on board which helped the traction though) Talking to Simon Rogers who tends to win most of the class 5 club events these days, he much prefers the Kumho's to the ACB10's which he alway found snappy (I didn't to be honest).
Details for the cheapest supplier can be found on Blatchat via the hillclimb/sprint pages by doing a search, but they are available through a number of Kuhmo motorsport dealers, BMTR in Birmingham have them/can get them.
Size wise I have the 235/45 R13 rear & 215/50/R13 front, but by the sounds of it you may be able to go with the 215 as rears but check suitable rim widths & 175 for the fronts, or 175 all round.
They are the Kumho Ecsta V70a in soft/med/hard compounds, sidewalls very stiff & could be an arse to get fitted to rims without damage, but no worry's if you use a proper skilled firm to do it! (BMTR for instance in Birmingham are v good)
Only really used mine in the wet, they were superb & not snappy with 257bhp (two people on board which helped the traction though) Talking to Simon Rogers who tends to win most of the class 5 club events these days, he much prefers the Kumho's to the ACB10's which he alway found snappy (I didn't to be honest).
Details for the cheapest supplier can be found on Blatchat via the hillclimb/sprint pages by doing a search, but they are available through a number of Kuhmo motorsport dealers, BMTR in Birmingham have them/can get them.
Size wise I have the 235/45 R13 rear & 215/50/R13 front, but by the sounds of it you may be able to go with the 215 as rears but check suitable rim widths & 175 for the fronts, or 175 all round.
fergus said:
Hi,
Can someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
K6A is the compound/ mediumCan someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
sam919 said:
fergus said:
Hi,
Can someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
K6A is the compound/ mediumCan someone point me towards the correct Kumho tyres? I've been an ACB10 devotee to now, but am up for giving something new a go. Which sizes do people go for? I run a 6/21 and 7/22 ACB10 setup at present and run 110mm and 125mm ride heights, with 250 lb/in and 200 lb/in spring rates.
What is their sidewall stiffness like, and how progressive are they on the limit?
1a or 1b tyres?
Are they available in different compounds?
Are they easy to fit, or do they have tight/difficult beads?
ta.
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