semi slick track tyres on the rear

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semi slick track tyres on the rear

Post by st1allstar on Mon Aug 17, 2015 7:19 pm

I fitted my trackday tyres onto the rear on my uno as I am going the nurburgring very soon, having had the rear arches professionally rolled and the plastic trim cut back I thought they would not rub but I was wrong,

upon measuring the tyres which are 195/50/15 on ultraleggera wheels which are 7j wide they rub slightly on the inside of the arch and the outside, |I actually measured the tyre and they are more like 205mm wide and upon checking there specifications this is correct for semi slick tyres like r888 etc

I took the springs out to see where they were catching at it was obviously, everywhere! with the 195/45/15 they dont catch but the 195/50 profile is a lot wider and taller,

I have come to the conclusion that without serious arch work and some wide spacers you cannot fit them to the rears without catching, I have given up with semi slicks for now and ordered some continential contisportcontacts, prob not as good as the federals on the track but I don't really have much choice.

has anyone else fitted semi slicks onto the rear of the uno with success?

they fit perfectly on the front, no spacers and no rubbing



195/45/15 fits fine on the rear no catching with no springs fitted





federals are sat on the arches :-(



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Re: semi slick track tyres on the rear

Post by Slim on Wed Aug 19, 2015 10:09 am

I had 195 45 16 toyo t1r on a 7'' rim and they didn't rub on the rear but did on the front, especially if I went to the bump stops. My current wheels/tyres stick right out and don't rub but I've only lowered it 30mm. I also have a beast of an anti-roll bar fitted to the back and mega springs on the front which probably help too.
SuperSoft Khumo V70A 215 50 13 overall tread width is 8'', best tyre I have ever experienced for feel and traction.

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Re: semi slick track tyres on the rear

Post by st1allstar on Wed Aug 19, 2015 11:11 pm

would be an option but I cant use 13's as they dont fit over any of my brakes front or rear
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Re: semi slick track tyres on the rear

Post by Slim on Wed Aug 19, 2015 11:46 pm

I have PGT1 brakes on my car and they stick out more than the GT3 brakes you have fitted. I'm fitting my GT3 calipers once they've been cleaned etc.

Team Dynamics Pro Race 1.2 13x7 will fit over both GT1 and GT2 at certain ET. Tyres will be close to outer arch depending on size/profile.

I can send you a profile drawing of the inner wheel with different ET's. I cut it out of foamex and it cleared the brakes. I have even made models of tyre profiles in the past to check tyre/arch clearance, sad I know but its cheaper than buying a tyre to check!

Good luck

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Re: semi slick track tyres on the rear

Post by st1allstar on Wed Aug 19, 2015 11:53 pm

its the rears more than the fronts that stick out,

in the end I have decided to go with these 14" wheels and 185/55/14 yokohama tyres, had to use some 20mm spacers due to the 60 offset though, not too keen on the look though, I have ordered some abarth centre caps from italy but I dont think they will come in time, I think Im going to have them reconditioned grey and polished lip as per the anti skid wheels







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Re: semi slick track tyres on the rear

Post by Slim on Thu Aug 20, 2015 1:04 am

Supposed to be good tyers, never used them myself. What compound are they?
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Re: semi slick track tyres on the rear

Post by st1allstar on Thu Aug 20, 2015 1:07 am

Medium
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Re: semi slick track tyres on the rear

Post by Slim on Thu Aug 20, 2015 1:10 am

I'd have gone soft on the back but they should be fine. I use soft all round but they don't get much heat in them on the hills. I did kill my front left doing a sprint at Llandow earlier this year, coarse tarmac and too many right turns.
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Re: semi slick track tyres on the rear

Post by richvans on Fri Aug 21, 2015 9:09 pm

Its a hard size to find, i found these used on caterhams, seem to work nice on the track

http://www.avonmotorsport.com/road-legal/performance/cr500

My mk1 has the 15" wheels with these and bigger brakes which work a treat

But i've had faster times out of my Mk2 with 8" wide 13" wheels with toyos on, but the brakes arent as good, well you just have to stamp harder!

Maybe look into pgt3 front brakes, are they bigger?
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Re: semi slick track tyres on the rear

Post by Slim on Sat Aug 22, 2015 3:27 am

Rich

I may be going for the Avon ZZR in hillclimb compound next year. Meant to be the best.

Toyo R888's?

GT3 calipers are better (bigger pads) than GT1/2. GT discs are bigger than Uno discs.

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Re: semi slick track tyres on the rear

Post by st1allstar on Sat Aug 22, 2015 5:27 am

I looked at the cr500 tyres but they don't make them anymore
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Re: semi slick track tyres on the rear

Post by Slim on Sat Aug 22, 2015 8:07 am

Kumho V70A's are amazing in the dry and the wet which makes them a good all round tyre for British weather. Probably not so good in the wet when they get low on tread.

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