Skinnier wheels/tyres for track - any problems?

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Manufactured from 2004 to 2011

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Dan258
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Skinnier wheels/tyres for track - any problems?

Post by Dan258 » Thu Jan 18, 2018 10:12 am

Hi,

I've found a set of style 32s with Yokohama Parada Spec 2s but the wheel size is 215/40R17. I'm currently running 225/40R18 fronts and 255/35/R18 rears. I'm potentially looking at getting the if I decide to track the car so I don't ruin my daily ones. Obviously there is going to be less grip but are there any other issues to look out for? This is all hypothetical at the moment.

Are they likely to overheat? Will braking be less effective as there's less contact area on the road? If so, could this lead to brakes overheating sooner? Are the sidewalls on these tyres suitable for the weight of the car? Anything else to be wary of?

Cheers
Dan
Last edited by Dan258 on Thu Jan 18, 2018 10:42 am, edited 1 time in total.

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marco_polo
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Re: Skinnier wheels/tyres for track - any problems?

Post by marco_polo » Thu Jan 18, 2018 10:14 am

17" Style 32 come in 7.5J to 9J, and various offsets, what exactly are you looking at please?

http://www.bmwstylewheels.com/bmw/32

I always prefer more rubber rather than less, to help prevent the tyres turning to sticky goo and letting go. Parada's aren't R rated so just a road tyre.

If they're 8J fronts, I'd be putting a pair of 245/40/17 on (assuming the offset will allow?)
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Re: Skinnier wheels/tyres for track - any problems?

Post by Dan258 » Thu Jan 18, 2018 10:41 am

Hi Marco,

Cheers for the quick reply! The offset is 41 so my guess is 7.5J based on the tyre dimensions? Surely he would have gone wider if they were the wider rim wheels right!? Still waiting to hear back on that though. Ideally, I'd like more rubber yeah, but they're a full set and have only done half a track day for around £200 so it seems like a pretty good deal.

I know they're not track spec tyres but I've read some reviews of them and they seem to be fairly "high performance road tyres" with very good dry grip. It just seems like a very good deal and track tyres could always be purchased in the long run!

Would there be any issues with brake fade or anything with these sized tyres?

It's a 130i if this makes any difference!

Dan

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Re: Skinnier wheels/tyres for track - any problems?

Post by marco_polo » Thu Jan 18, 2018 10:52 am

You won't get any extra brake fade, quite the opposite. They tyres should melt long before the brakes overheat, not that melty tyres are a good thing for stopping!

I'd scrub them out, and fit a set of 225/45/17 (or 235/40/18 maybe) R Spec whatever.

Are they staggered?
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Re: Skinnier wheels/tyres for track - any problems?

Post by Dan258 » Thu Jan 18, 2018 11:08 am

Ah okay, wasn't sure if a lower contact area would increase brake usage - the friction has got to come from somewhere! But that all makes sense.

I think swapping them out would be the plan in the long run but having just forked out for a whole new set of normal tyres, they may have to wait!

They're not staggered no, well as far as I've been told, all 4 are the same.

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Re: Skinnier wheels/tyres for track - any problems?

Post by docwra » Thu Jan 18, 2018 1:51 pm

Only thing you really need to worry about when putting on smaller rims is if they will clear the brakes.

I reckon even narrower Parada 2's will be better than standard RFT's as well, I remember I got on well with them ....... but cant remember which car they were on :lol:

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Re: Skinnier wheels/tyres for track - any problems?

Post by Dan258 » Thu Jan 18, 2018 2:24 pm

I've been reliably informed from previous threads that 17s will fit over the 130s calipers so fingers crossed we have no issues there!

Yeah, that was my thoughts, I've got Goodyear Assys 3 on which are obviously far better than standard but my thoughts are if the car came with 205 front and 225 rear runflats OEM, surely 215s non runflat 'sportier' tyres, are going to be better!?
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Re: Skinnier wheels/tyres for track - any problems?

Post by marco_polo » Thu Jan 18, 2018 2:38 pm

A square set-up is going to give you better balance/less understeer, and a 215mm Yoko is probably going to be less melty than a 205mm Runcrap (although Runcraps aren't actually that bad on a smooth track).

I'd still be putting inexpensive 225/45 R spec's on when they're toast. :D
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Re: Skinnier wheels/tyres for track - any problems?

Post by Dan258 » Thu Jan 18, 2018 3:07 pm

Yeah, that's exactly the plan. I'd best get haggling.
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