R888 Tyres - Astonishing Value for Money

[Rusti Evo]

spatz said:

what is the smallest width R888 that you can fir on the rear rims ?

There are good stocks of 315/30/18 but Toyo recommend 10.5 - 11.5 rims

[shithotfast]

The revs per mile vary quite a lot between each of these tyres. Since going from Eagle F1s to V70a's I have noticed my top speed drop considerably, any one else noticed a change in top speed with different tyres.

They all have different revs per mile details so they will affect top speed quite a bit. At the wings and wheels day recently I maxed out at around 155mph, whereas before with the F1's I hit the same limiter at 175 mph.??

[spatz]

I wonder how you measured your speed, the problem with the speedo in a car is that it is actually more a rev meter of the drive shafts, so wire diameter can play a major roll.....

[andygtt]

sthotfast said:

They all have different revs per mile details so they will affect top speed quite a bit. At the wings and wheels day recently I maxed out at around 155mph, whereas before with the F1's I hit the same limiter at 175 mph.??

thats a huge difference are you sure that was all down to the tyres as they must have been very different rr?

[Rusti Evo]

O/D of tyres in mm:- 335/30/18
658 F1 Fiorano
655 Kumho V70A
660 R888

Edited by Rusti Evo on Monday 25th October 20:35

[shithotfast]

andygtt said:

sthotfast said:

They all have different revs per mile details so they will affect top speed quite a bit. At the wings and wheels day recently I maxed out at around 155mph, whereas before with the F1's I hit the same limiter at 175 mph.??

thats a huge difference are you sure that was all down to the tyres as they must have been very different rr?

well I was only going by the rev limiter, last year I didn't hit the limit until nearly the end of the straight, this year I hit it just over half to 2/3rds down. I don't think the clutch was slipping but the speedo (97% correct) showed around 155mph.

I notice the revs per mile of some tyres are around 2-3% different, not sure how you work out the speed difference? Toyos are 812, kumhos are 794...cant find the goodyear numbers but they have a load more tread. how do you convert the rev specs to speed difference?

[V8Dom]

Rusti Evo said:

I am running R888 on the new car and they really are excellent - although there are a couple of negatives. There is always availability problems with these and I have been scouring Europe for some more rears. Toyo and Camskill are not anticipating stock until into 2011. An obvious statement but they don't like standing water. Silly o'clock Wednesday morning with frost damp required proper caution on roundabouts but is not as scary as you might think. Rumour has it that R888s will be dropped soon as they cannot comply with new EU tyre noise regulation.

I'm guessing it would be difficult for the factory to recommend the R888 for standard fitment as safety in bad weather conditions is dependant on the driver having a sensible and experienced head on.

It will be interesting to do a back to back test soon against the V70A. My guess is that the Kumho is the better and more grippy tyre but their shallow tread depth rules them out for road use for me.

My limited experience:

Goodyear old type F1 and Michelin Pilots:- Hard compunds, rears spin up easily

Fioranos:- Excellent all round road tyre - tread pattern punches through puddles well

V70A:- Good grip, heavier steering, short legal road life, aquaplanes

R888:- Long life, grip, good compromise road/trackday, don't be a hooligan in the wet

thankyou, in depth and helpfull..

I think my experiance has been greatly helped over the weekend running the car over the peaks in frost, ice and water with 1 rear with 2mm and the other...cough cough semi slick, so a great deal of tail slidding and twichyness had for me as a driver and cameras attached to the car..epic footage apparently.
I like the idea of the kumos but I need a tyre I can do some miles on and well a complete set is nearly 2 weeks wages so they have got to last..

Dom

[UltimaCH]

V8Dom said:

I think my experiance has been greatly helped over the weekend running the car over the peaks in frost, ice and water with 1 rear with 2mm and the other...cough cough semi slick, so a great deal of tail slidding and twichyness had for me as a driver and cameras attached to the car..epic footage apparently.
I like the idea of the kumos but I need a tyre I can do some miles on and well a complete set is nearly 2 weeks wages so they have got to last..

Dom

So where is the epic footage?? Would like to see pleeeeese

[V8 Vum]

Guys, wondering if the best way of 'proving' the accuracy of your speedometer would be to put a TomTom or similar in the cab and compare, would I be right in thinking that the satnav speedo would be more accurate, or less????

Anyone know?

cheers

Keith

[scoobydanb]

A GPS will be more accurate than a speedometer. The GPS uses your dx/dt, the speedometer it relying on a conversion between the rotation of a drive shaft and the circumference of the tyre.

[V8Dom]

UltimaCH said:

V8Dom said:

I think my experiance has been greatly helped over the weekend running the car over the peaks in frost, ice and water with 1 rear with 2mm and the other...cough cough semi slick, so a great deal of tail slidding and twichyness had for me as a driver and cameras attached to the car..epic footage apparently.
I like the idea of the kumos but I need a tyre I can do some miles on and well a complete set is nearly 2 weeks wages so they have got to last..

Dom

So where is the epic footage?? Would like to see pleeeeese

Still waiting for edit, but here is last weeks

http://www.youtube.com/watch?v=h4_lsZsz14Y&fea...

Dom

[V8Dom]

V8 Vum said:

Guys, wondering if the best way of 'proving' the accuracy of your speedometer would be to put a TomTom or similar in the cab and compare, would I be right in thinking that the satnav speedo would be more accurate, or less????

Anyone know?

cheers

Keith

Keith I have Tom Tom and heads up gps display and with Goodyears, my speedo is 99% accurate at 100mph.. however thats on the flat, up or downhill will be different, as satilite speed is measured from above, so it does not know if you are going up a 1 in 4 hill.

Dom

Edited by V8Dom on Tuesday 26th October 23:17

[V8 Vum]

V8Dom said:

V8 Vum said:

Guys, wondering if the best way of 'proving' the accuracy of your speedometer would be to put a TomTom or similar in the cab and compare, would I be right in thinking that the satnav speedo would be more accurate, or less????

Anyone know?

cheers

Keith

Keith I have Tom Tom and heads up gps display and with Goodyears, my speedo is 99% accurate at 100mph.. however thats on the flat, up or downhill will be different, as satilite speed is measured from above, so it does not know if you are going up a 1 in 4 hill.

Dom

Edited by V8Dom on Tuesday 26th October 23:17

Absolutely right Dom, however by doing a test at various speeds on the flat, you can get a very good idea of any speedo discrepancy. Obviously if you are using a mechanical speedo, not much can be done, however if you have an electronic version, like my SPA dash, then I think there is a way of adjusting to compensate for any tire change by dialing in the new circumference?

cheers

Keith

[V8Dom]

anyone know the cheapest supplier for these R888, for rears im have quotes ranging from 260-440 each?? looking at a full set I recon.

Also Stuart who supplied the cannards and how much were they?

Thanks Dom

[GTWayne]

Hello Dom.

I know you asked Rusti the question but I am sure he wont mind this interjection.

I have 888's on the GTW and found Camskill to be the most competative at the time but you would be well advised to shop around as deals come and go with various suppliers. Bear in mind that Stuart did say there are currently no rear tyres in our size available in this country so that may be the biggest problem. I know you have been quoted but that is only the first step. I have experienced similar only to be told that although that is the retail price, they can not be supplied at this current time! Very helpful that. don't you just love wasting your valuable life away like that? (at least being Ultima owners we are well used to this special kind of time wasting I guess )

SSS can and will no doubt supply you some canards but price will depend on supply/demand/lead time and of course from what direction the wind is blowing on that day . Good luck.

[V8Dom]

GTWayne said:

Hello Dom.

I know you asked Rusti the question but I am sure he wont mind this interjection.

I have 888's on the GTW and found Camskill to be the most competative at the time but you would be well advised to shop around as deals come and go with various suppliers. Bear in mind that Stuart did say there are currently no rear tyres in our size available in this country so that may be the biggest problem. I know you have been quoted but that is only the first step. I have experienced similar only to be told that although that is the retail price, they can not be supplied at this current time! Very helpful that. don't you just love wasting your valuable life away like that? (at least being Ultima owners we are well used to this special kind of time wasting I guess )

SSS can and will no doubt supply you some canards but price will depend on supply/demand/lead time and of course from what direction the wind is blowing on that day . Good luck.

Thanks Wayne, hope you are well mate and over the troubled times..glad ur back.

Dom

[Rusti Evo]

Just a little update on the R888s..

My latest car has done 1000 gentle running in miles of which there were 40 - 50 gentle bedding in laps of Brands. Camber carefully adjusted to give even temperatures and scuffing accross the tyre. I don't know if the detail will show on screeen but on the fronts the wear is so low that the witness of the central moulding line is still visible.

There seems to be something "just right" about these tyres on Ultimas. In a previous life with EVOs the fronts would start to melt maybe within 4 hard laps. I am sure a sunny day at Combe will get some get some rubber worms coming off the tread but they do seem to have a really easy time on Ults

As an aside I recently did a thumbnail test on the P Zero and was a bit shocked as to how hard the compound is.

Testing on slicks will be a even more interesting....

[V8Dom]

hi
what sizes are you guys running...wanted something a little smaller on the front so it doesnt rum the arches.

Thanks dom

[GTWayne]

The exact correct size as fitted standard to our cars is not available in the Toyo 888 range Dom. Rusti (when he re shod X8) went over and I went under if I remember correctly
There were no problems either way although my car is not standard so not really an accurate test but as Rusti's was and he went larger without issue, I can't see a problem.

[V8Dom]

hi
just had a long chat with Toyo direct
the R888 will still be produced for at least 2 more years, but they dont have stock as season is near the end and dont store the track tyres over winter.
rears available next season 335/30/18

but fronts not available as you say... I have a clearance issue on my car where the front left touches the clip..ive cut away inside the lip as suggested by the factory and rechecked alignment but it still touches sometimes .. so id be more interested in the smaller sizes than larger(rusty will be running heavier spring/damping for the circuit or even some roll bars)
Wayne can you chck for me some time you have 225/40/18 instead of the factory 35 profile?

thanks Dom