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Stuntman

Tyres question for the forum

The M3 will need a new pair of rear tyres in 1000-2000 miles' time.  The car has been on Continental Sport Contact 5P tyres since 2012 (I prefer them to the Michelin PS2s that it started life on) but these tyres are now very hard to find and my dealership cannot quote for them.

The car had new fronts about 5000 miles ago, these last about 25000 miles.  

The 5P is being superseded by the Sport Contact 6, which is meant to be an improvement and the tread pattern appears similar.

So my question is - would you have any qualms about mixing 5Ps on the front with 6s on the rear?  I've always replaced like-for-like in the past and only changed brands when replacing all four tyres.
Sav

How worn are the front SC5's? If they significantly worn, that would be an incentive to get SC6's all round. If not, I wouldn't have an issue with mixing those particular compounds front to rear. I've got mixed tyres front to rear on mine, but also from the same brand and both have a similar pattern. I'd be telling porkies if I said it was adversely affected the handling.

My dad also changed the rears on his with Michelin PS4's recently, with the front PS3's still fresh. No issues.
Stuntman

Fronts have about 6mm on them, probably good for about another 20k miles.
Sav

In that case I would be leaving the fronts and just replace the rears, given the similar pattern, same range, and both compounds are from the same company.
PR

The other option would be to replace all four and recoup some of your outlay by selling the still decent fronts on eBay. I've done this a few times with varying degrees of ease.

I'm a bit OCD with tyres and would want all four to match. Both of my Compacts had different generation Conti Sport Contacts front to back at some point and felt distinctly improved with the same tyres all round.
simonp

The PS4s seem to be getting rave reviews, but did read one guy's opinion that he preferred the PS2, so may be best avoided. The CS6 also seems to be rated highly. Any qualms and do like Piers says, change all 4 and flog the two spares. Personally, though, I'd mix and match, as that sort of thing doesn't worry me.
Chris M Wanted a V-10

Re: Tyres question for the forum

Stuntman wrote:
So my question is - would you have any qualms about mixing 5Ps on the front with 6s on the rear?

Nope, I'd have no issue with having one make/model of tyres on the fronts and another on the rears.  I don't think I have ever mixed brands on an axle but I've often had different brands front-to-rear when a whole set wasn't called for at once.

Mind you, I hardly drive cars noted for their performance.......
gonnabuildabuggy

Having gone from SP2's to SP5's I'm sure the tread pattern will be virtually identical.

You should still be able to get SP5's though, I've just bought a pair.
JohnC

I would just change the rear tyres and then see how the balance is. With the same manufacturer and a similar tyre I doubt the difference is going to be large. The first bit of rain will tell you if you have anything to worry about and if so, you can change the fronts and sell the old ones.
Stuntman

Thanks all.  I'll almost certainly put a pair of SC6 on the rear when the time comes.

GBB - the tyres I'm after are SC5P rather than the SC5.  The 5P is a "high performance tyre" whereas the 5 is more generic.  Continental does a bespoke MO version of the 5P for Mercedes but I'm after the normal 5P in 265/35 ZR19 98Y.
Roadsterstu

What do the M3 forums say (and over how many pages?!)

I think you will be fine mixing different tyres front and back but if you don'tlike the mix then do as Piers suggested, sell the existing fronts and buy tyres that match the rear. I think you'll really only know fully what the SC6 are like when you can feel them through the steering anyway.
Alf McQueef

This is something I don't love doing, but it you have "staggered" tyres, it's hard to avoid. I'll be in the same boat later in the summer, I won't be putting the very amusing but traction-limited Dunlop OE tyres back on, I'll move to either the newer version Dunlops or something different like Pirellis.

I think if the tyres are broadly the same type - i.e. you are not mixing standard full depth road tyres with track-focused "cup" types, winters/all-seasons/summers, really cheap with really good, and so on, I can't see it will do more than be slightly annoying. In which case you can switch the fronts later, and as Piers says, sell the old ones.

Also if the better ones are on the rear, that's less likely to be an issue. I blamed some big lift off oversteer moments on different brands of tyre front and rear when younger, but on reflection I think I was just driving like a twat.

I'm not a fan of low tread depths in wet weather either - how low I take the  rears on the XFR (I'd never take fronts much below 3mm) and when I change them on the C Max, will depend partly on the weather! I change them earlier in winter.
Stuntman

Alf McQueef wrote:
I'm not a fan of low tread depths in wet weather either - how low I take the  rears on the XFR (I'd never take fronts much below 3mm) and when I change them on the C Max, will depend partly on the weather! I change them earlier in winter.


I'm with you on the wet weather point.  My rears are at 3mm now.  All being well I will change them in Sep-Oct, or sooner if I find work.
Chris M Wanted a V-10

Alf McQueef wrote:
....and when I change them on the C Max, will depend partly on the weather! I change them earlier in winter.

What tyres have you got on your C-Max and have you changed any yet? Life?
Mine is on Michelin Primacy, rears hardly wearing after 7.5k and fronts a couple of mm worn.
Alf McQueef

Chris M Wanted a V-10 wrote:

What tyres have you got on your C-Max and have you changed any yet? Life?
Mine is on Michelin Primacy, rears hardly wearing after 7.5k and fronts a couple of mm worn.


Very weirdly the C Max came with Conti Sport Contact 3's all round. Good tyres, but as I found when I had them on the Audi, they don't last - the fronts are on about 2-3mm, the rears 3-4, after only 22k miles. It is driven pretty placidly. I had meant to switch fronts to rears to equalise wear but I think it's too late now - I'll probably just change all 4 since I want it on all season tyres like the Golf was, which were superb in snow and - for the sort of drving its used for - not noticeably different in summer. I'll probably try the new Michelin CrossClimates:

http://www.tyrereviews.co.uk/Arti...unched-is-this-a-game-changer.htm

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