Discussion
Im potentially just about to buy a set of these in medium compound but not used before. (used almost everything else!)
Can anyone comment of the life of these tyres please?
They come with less tread depth than other Race/Track tyres and Im wondering if its false economy to buy these instead of getting another set of 888's. It would save me quite a bit if I went for Kumho but not if they don't last. (relative to serious track use!!)
Thanks
Can anyone comment of the life of these tyres please?
They come with less tread depth than other Race/Track tyres and Im wondering if its false economy to buy these instead of getting another set of 888's. It would save me quite a bit if I went for Kumho but not if they don't last. (relative to serious track use!!)
Thanks
What are you putting them on and what are you using them for?
I have used them on my Westfield Hayabusa, I found them to be slow to warm up on the rear compared to ACB10's, taking a couple of laps to come on properly. I only do 10 or 15 lap races so it makes a big difference to a quick getaway. They did last quite well and I would rate them well above 888's.
If your using 13" rims like me you may struggle with gearing too as the sidewalls are very low compared to 888's.
Overall they are very good value for money though.
I have used them on my Westfield Hayabusa, I found them to be slow to warm up on the rear compared to ACB10's, taking a couple of laps to come on properly. I only do 10 or 15 lap races so it makes a big difference to a quick getaway. They did last quite well and I would rate them well above 888's.
If your using 13" rims like me you may struggle with gearing too as the sidewalls are very low compared to 888's.
Overall they are very good value for money though.
For hillclimbing, Kumho V70A in SuperSoft are the favourite list 1b tyre at the moment. They are as good (or bad) in the wet as any other 1b.
The Avon ZZR is now available in A24 compound and some people prefer this to the Kumhos.
To the OP: as I use the SS compound for sprint/hillclimb, I have a set of hard compound for track and road so I don't have to alter the set-up. They take a couple of laps to get up to temperature but will then work well for 20 minutes or so depending on the surface. After that they seem to go off. Friends have used medium compound on track days and they go off a bit too quickly. All this on Caterhams.
To give you an idea of suitability for road use, I used to drive to events on soft compound Kumhos and I could get 3000 miles and a season of competition (15 events, dual driven) out of them.
The Avon ZZR is now available in A24 compound and some people prefer this to the Kumhos.
To the OP: as I use the SS compound for sprint/hillclimb, I have a set of hard compound for track and road so I don't have to alter the set-up. They take a couple of laps to get up to temperature but will then work well for 20 minutes or so depending on the surface. After that they seem to go off. Friends have used medium compound on track days and they go off a bit too quickly. All this on Caterhams.
To give you an idea of suitability for road use, I used to drive to events on soft compound Kumhos and I could get 3000 miles and a season of competition (15 events, dual driven) out of them.
I think they are fantastic Tyres at nearly half the price of 888's on my Sunbeam Lotus. 860KGs with 329BHP.
I used the soft compound Khumo's at the Manx Classic in April last year, it was 3 sprints I had never been on, but they performed really well recording 2nd quickest in 2 of the events.
I was using 888's for longer races, but swapped to the Khumo medium compound midseason when 888 supply in my size were not available. I did 4 Heritage 40 min 2 driver races, and the 1 Hour GT, Sports and Saloon Car Challenge Race @ Spa last September.
They delivered 5 outright wins on one set of tyres and still have another couple of meetings in them for dry weather, so they last about 6/7 hours on my car. They never went off, even after an hour flat out round Spa, recording fastest lap a couple of laps from the end, in a 1.45.8, a second quicker than the fastest GT40 in the 6 Hour Race.
I could not recommend them highly enough :'0)
I used the soft compound Khumo's at the Manx Classic in April last year, it was 3 sprints I had never been on, but they performed really well recording 2nd quickest in 2 of the events.
I was using 888's for longer races, but swapped to the Khumo medium compound midseason when 888 supply in my size were not available. I did 4 Heritage 40 min 2 driver races, and the 1 Hour GT, Sports and Saloon Car Challenge Race @ Spa last September.
They delivered 5 outright wins on one set of tyres and still have another couple of meetings in them for dry weather, so they last about 6/7 hours on my car. They never went off, even after an hour flat out round Spa, recording fastest lap a couple of laps from the end, in a 1.45.8, a second quicker than the fastest GT40 in the 6 Hour Race.
I could not recommend them highly enough :'0)
i thought the average speed for your (starlet is it?) was amazing at 150 odd mile an hour....you had me searching the classifieds for one !!I've just come across this thread and am very interested by it, as I'm going to run the Kuhmo's on my Time Attack S1 Exige this year. However, I'm struggling slightly to work out what compounds to go for. I was thinking medium all round but a set of the softest ones too for any finals I may get into. Any ideas please?
jamwill79 said:
I've just come across this thread and am very interested by it, as I'm going to run the Kuhmo's on my Time Attack S1 Exige this year. However, I'm struggling slightly to work out what compounds to go for. I was thinking medium all round but a set of the softest ones too for any finals I may get into. Any ideas please?
Don't get supersoft as they are for hill climbing. In my caterham which is about 430kg i can get away with softs on some circuits but only on the front and had to use mediums on the rear. The mediums once they have heat in them are better all round and would suit the warm up lap then fast lap set up of time attack.But for the price of a spare set of tyres its worth doing a back to back test on soft and medium to see for yourself.i was going to buy the r888 then changed my mind for the v70s but ended up with the acb10s i spoke to lots of independent race tyre specialists and most say the acb10 is a light weight race tyre and is superior to tyres such as v70 r888 cr500 etc. as these are a fast road tyre.
im not slagging them off as ive never used them just going on advise.
i hope there correct the truth will be in the testing on the 28th march.
im not slagging them off as ive never used them just going on advise.
i hope there correct the truth will be in the testing on the 28th march.
migliacars said:
i was going to buy the r888 then changed my mind for the v70s but ended up with the acb10s i spoke to lots of independent race tyre specialists and most say the acb10 is a light weight race tyre and is superior to tyres such as v70 r888 cr500 etc. as these are a fast road tyre.
im not slagging them off as ive never used them just going on advise.
i hope there correct the truth will be in the testing on the 28th march.
I use Kumhos for the treaded try tyre class NSSCC, medium compound 235+215 F + R. Im going to use soft for qualifying and potentially soft fronts for race in coldish weather. I use the mediums for race and there good, very good. I tried ACB10 and the unsprung weight/ car weight difference of about 1.5-2kg per tyre (if i remember right) wasnt enough to justify the lack of grip over the Kumho so i stopped using them. The kumho is a quite a square hard side walled tyre so you might have to mess about with camber settings to your normal set-up. im not slagging them off as ive never used them just going on advise.
i hope there correct the truth will be in the testing on the 28th march.
The mediums do need a bit of warming up, which can be achieved reasonably well in the formation and green flag laps, plenty of accelerating then braking rather than side to side as this seems to get more heat into the tyres.
Pressure wise on a caterham im starting with 15LR/16RR/17FL/18FR, and these all go up after 15 mins qualy to around 21, but when your testing set them all to what you think or a little higher, get them to temperature, equalish with 10 deg from inner/middle/ outer, then set them all to 21 hot. This should if possible be done as you come into the pits straight away.
In a 40 min race at Snetterton old circuit, i drove about 26 mins before they started to feel like the rears were going off, it was April and the weather was mild, track not hot at all.
In a 15 min + 1 lap at Croft the mediums do well, they do get upto temperature but i have never had them go off yet, this is for the rears, the fronts, as they only go up a few psi seem to be ok, hence the potential to use softs, im not 100% on this and track temp will be a key issue for such use.
A wet weather tyre, the R888 takes some beating if you are happy with the tyre widths, although they do a 225 i think now for higher hp cars/ extra width. If its pouring or very much wet, set your tyre pressures to higher than normal 30+ if need be, this opens the tread up and disperses the water better. If your test day is wet, try experimenting with these pressures see below, i learnt this trick of the guy / Guy who is won the race, guff copy but you get the message.
The Kumho has bee used for quite a few years now, but i first saw it being used 1. A hayabusa fury which was very quick 2. Club champion lap record for class holder Syla Pheonix R1, 1.29 Croft. At this point no one wanted to kow the Kumho as it was ACB10 and CR500 all round, as thats what the caterham championships used, but over the past few years it has gained popularity based on its performance.
http://www.youtube.com/watch?v=wrB69IrrzkA
Treaded tyre in the dry Kumho any day of the week......although in the battle for the worlds best track tyre we now have the ZZR, the reports are good.......
Anyway each to there own, its very much an opinion on personnal prefference
Edited by sam919 on Saturday 10th March 23:24
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