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Conti sport contact 5 and 6

Alloy wheels and tyre discussion
Pondrew
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Conti sport contact 5 and 6

Post by Pondrew » Fri Nov 18, 2022 7:45 pm

My new tyre sizes are seemingly a problem to find matching tyres for the front and rears.

After a long conversation with my local tyre place (a national chain), there are only two makes that do both sizes. One is Michelin PS4S, but they are stupidly expensive; over a grand for 4 wheels.

I can get Conti SC 5s on the front and Conti SC 6s on the rears. I have looked up the differences online but really can't find much information. Is there any potential problem with putting 'different' tyres on the fronts and rears, albeit the same make?
I have seen some threads which sing the praises of Continentals, but presume they are the same spec tyres front and rear.

Disclaimer: I know I have argued before that a 'tyre is a tyre', but even I won't put £60 Chinese 'ditchfinders' on a 360bhp car. That is the only other option for my sizes.
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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Conti sport contact 5 and 6

Post by pvr » Fri Nov 18, 2022 9:14 pm

I would be very happy with £1k for 4 tyres :o
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B21
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Conti sport contact 5 and 6

Post by B21 » Fri Nov 18, 2022 9:40 pm

I’ve used the 5 and 5P together…

Technically they are probably a bit behind the MP4S whereas the 7 is clearly ahead…

I’ve always like the feel that all the Contis have on E89s..obviously the 4 is different but it’s another rear wheel drive car..

They wore pretty fast under my foot..but then again all tyres do…

What sizes do you need?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Conti sport contact 5 and 6

Post by smorris_12 » Fri Nov 18, 2022 10:32 pm

I've never seen the need to match front and rears.

Axle sets left to right makes sense, but since the front and back of cars are doing different things, supporting different weights, are attached to different suspension setups and are located at opposing places, mandatorily having one set of tyres all round seems odd to me.

Indeed, if one was needing/wanting certain driving characteristics then different axle sets will instantly do this. Sir wants a slightly more of an oversteery setup, have these and these. Slightly more neutral, try these with those.
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Pondrew
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Conti sport contact 5 and 6

Post by Pondrew » Fri Nov 18, 2022 11:43 pm

B21 wrote: Fri Nov 18, 2022 9:40 pm What sizes do you need?
235/40/19 fronts
265/35/19 rears

I have done a lot of research (will they fit.com) and these are the optimum sizes front and rear for the width of rims and rolling radius difference compared to standard. If I went 275 rears, it would be less of a problem for tyre choice but more for RR.

I never knew it would be so complicated TBH.
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

Pondrew
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Conti sport contact 5 and 6

Post by Pondrew » Fri Nov 18, 2022 11:45 pm

smorris_12 wrote: Fri Nov 18, 2022 10:32 pm I've never seen the need to match front and rears.

Axle sets left to right makes sense, but since the front and back of cars are doing different things, supporting different weights, are attached to different suspension setups and are located at opposing places, mandatorily having one set of tyres all round seems odd to me.

Indeed, if one was needing/wanting certain driving characteristics then different axle sets will instantly do this. Sir wants a slightly more of an oversteery setup, have these and these. Slightly more neutral, try these with those.
Appreciate your comments, thanks. I am new to all this "modifying".
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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B21
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Conti sport contact 5 and 6

Post by B21 » Fri Nov 18, 2022 11:54 pm

Pondrew wrote: Fri Nov 18, 2022 11:43 pm
B21 wrote: Fri Nov 18, 2022 9:40 pm What sizes do you need?
235/40/19 fronts
265/35/19 rears

I have done a lot of research (will they fit.com) and these are the optimum sizes front and rear for the width of rims and rolling radius difference compared to standard. If I went 275 rears, it would be less of a problem for tyre choice but more for RR.

I never knew it would be so complicated TBH.
So what rim sizes are they?

Before giving you my considered response :tumbleweed: :rofl:
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Conti sport contact 5 and 6

Post by Pondrew » Sat Nov 19, 2022 12:11 am

8.5" front
9.5" rear
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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B21
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Conti sport contact 5 and 6

Post by B21 » Sat Nov 19, 2022 12:15 am

Pondrew wrote: Sat Nov 19, 2022 12:11 am 8.5" front
9.5" rear
Sports contact 7 235 or 245 front and 275 rear
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Conti sport contact 5 and 6

Post by Pondrew » Sat Nov 19, 2022 12:22 am

B21 wrote: Sat Nov 19, 2022 12:15 am
Pondrew wrote: Sat Nov 19, 2022 12:11 am 8.5" front
9.5" rear
Sports contact 7 235 or 245 front and 275 rear
Those sizes don't work with the RR. Will put my speedo out by too much, as well as any other 'issues' with TPMS sensing etc. The car has VSS which concerns me with too wide fronts aswell. The ride height also goes up which I am concerned about. I am putting eibach springs on, so the calculations get far too complex for my tiny little noggin!

I know I am overthinking it, but this is a big outlay for me and I don't want to cock it up! :oops:
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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B21
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Conti sport contact 5 and 6

Post by B21 » Sat Nov 19, 2022 12:23 am

RR?

VSS?

What car is it on?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Conti sport contact 5 and 6

Post by Pondrew » Sat Nov 19, 2022 10:09 am

B21 wrote: Sat Nov 19, 2022 12:23 am RR?

VSS?

What car is it on?
RR is my abbreviation for rolling radius or circumference.

VSS is variable sports steering. I can't notice any difference to normal to be honest.
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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Conti sport contact 5 and 6

Post by tiglon » Sat Nov 19, 2022 10:14 am

Only one solution really.... get new wheels as well!
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B21
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Conti sport contact 5 and 6

Post by B21 » Sat Nov 19, 2022 10:18 am

Well 235 and 275 are the way to go…those sizes are as far as Continental are concerned are the ‘perfect’ fit for those rims (245 valid as well)

Your car has TPMS so RR is irrelevant

DSC wise the change is well inside tolerances for even the E89 let alone later DSCs

Speedo change is immaterial as the speedos under-read by some way..you can always cross check with GPS..

Your other option is to fit Sports 7 on front and whatever on the rear..although in theory oversteer could happen if you really hoon it..

Ride height wise it’s in the noise..
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Conti sport contact 5 and 6

Post by mr wilks » Sat Nov 19, 2022 10:44 am

Pondrew wrote: Fri Nov 18, 2022 7:45 pm
My new tyre sizes are seemingly a problem to find matching tyres for the front and rears.

After a long conversation with my local tyre place (a national chain), there are only two makes that do both sizes. One is Michelin PS4S, but they are stupidly expensive; over a grand for 4 wheels.

Try finding a better national chain :P they are talking balls .
Amongst many others you can get Dunlop Sportmaxx RT in 235 40 19 / 265 35 19 (£750ish) Hankook Evo 3s ( (£650ish ) & Rainsport 5s
(£750ish )
Id avoid the PS4S at all costs , for the 3rd time i have just removed a set from a car & regarding cabin noise its impossible not to notice the improvement + they arent that great on cold , damp tarmac in RWD cars
3 ZMRs
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