All Things Mk5 > Performance Modifications
Ways of reducing the weight of our cars
the bruce:
--- Quote from: _Nathan_ on May 23, 2011, 09:46:53 pm ---What do the Seat supacopas run?
--- End quote ---
Yokohama
210/650 R 18 wet
230/650 R 18 dry
http://www2.yokohama-online.com/ch/motor-sport-event.php?pageID=22114
Volkswagen Motorsport Sciroccos R cup and 24h use 18" as well.
Of course 17" won't be much slower on most circumstances.
Biggest argument for 17" is the price !! And I strongly believe that
17" Direzzas will be faster than most 18" semis.
_Nathan_:
Thing is without access to the regs it is difficult to know why they are running a given wheel size, wheel size is often dictated by brake size, I have heard people say to run the smallest wheel that will fit over your brakes and certainly don't believe that the bigger the better, the only way to be sure is to do a back to back in the car being discussed with the same driver and an engineer on hand to adjust the geo and damping to suit the tyre. I doubt there is a hard and fast x size is quicker rule that works across all cars and all setups due to the implications of weight, the way tyre side wall acts as part of the suspension, slip angles of tyres etc etc.
Have you compared Michelin Pilot Sport Cups to Direzzas? On my other car the MPSC really is very good indeed for a road legal tyre, I'd be surprised if anything was faster on that car, Golfs may differ obviously.
the bruce:
Nathan,
I never tried Direzzas on my car and I never tried PS Cup. I cant't afford testing
all makes of tyres.
But I know some people doing motorsports and talk to them nearly every week.
I have some friends doing Autocross as I do and some professinals like Chris Breuer
at Raeder Motorsport. Further on I see what kind tyres win the races.
So that's (just) one basis for my point of view. I want to win. So I'm going to buy
the right stuff that provides first places. The PS Cup is one of the very best semis,
the V70 as well. But the Direzza currently is even better imho.
I know about choosing wheel sizes depending on regs an brake dimensions.
But this does not mean with a smaller brake you better go for smaller wheels.
I also never said ''bigger is better''. I know about ''rotational masses'' and the
damping properties of tyres. I currently have three sets of wheels, 17", 18" and 19".
No doubt - 19" is slowest.
So I'm wondering if you misunderstood me. :wink:
Fact is:
- Raeder recommends 18" for track days (''Touristenfahrten'')
- Volkswagen Motorsport uses 18" on Leon, Scirocco and Golf
- formely many teams used 17"
So you can make your opinion by yourself. :wink:
fuscobal:
http://www.mk5golfgti.co.uk/forum/index.php/board,27.0.html > Anyone ? :party:
_Nathan_:
Hi The Bruce - Sorry, I wasn't saying you had said bigger the better, just saying that I didn't think like that.
All I was getting at is wondering if Seat would've specified 18" wheels if they had smaller brakes? I guess we will never know.
I run 250/640/18 all round on my car despite the road car coming on 19" wheels (235/35/19 & 265/30/19), I'd give 17" wheels a go if they fitted over the brakes.
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