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New 18" wheels, but which tyres ?

C

ChrisW

PCGB Member
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I have just bought some 18" Carrera wheels --- 7.5"(50) front and 9"(52) rear --- for the N-GT.

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I have the correct Bridgestone SO2 tyres which would fit, but am wondering if I should instead buy a set of R888's ?

As an aside, these will only weigh 1.5Kg's more per wheel than the Mags --- massively less than Mille Miglia Cup 1 replicas etc --- though Cup 2's are the best period Porsche 17" Ali option weighing about the same as the 18" Carreras.

I'd appreciate your thoughts --- but I think they look pretty good ! Pics of the car with Cup 2's if anyone is interested ---

(The 17" mags are going for refurbishment (again) --- I'll let you know in two years time if this outfit can do a good job !)


 
ChrisW, great wheels these, Porsche supplied (non copies) are made by BBS,,,,I run the 8 & 10 x 18" version with Toyo 888 on my 93CS, lighter and easier to maintain than the split rim Speedlines, having said that the Speedlines do go back on from time to time, as they look so good![:D]
 
And Melv hits the nail on the head ! Jason, fear not, I am just trying to sort out my mags --- they proved to be a disaster for track work this year --- what with the powder coating peeling off the rims on the outside and falling off the rims on the inside --- they are gently drying in my play-room (that goes down a bundle --- my wife keeps complaining that her liking for oily fish is causing the place to smell --- but I know it's of R888 !). I will be trying a new Mag refurbisher shortly ... and they will be for best ... what tyres ?? ! I have a set of good 17" SO2's and a set of 17" PS Cups --- new --- I also have another set of very worn but perfectly good Mags --- and worry only that they are getting so old and R888's expect so much of them --- At the moment I have some Cup 2's on from a 968CS --- with 15mm wheel spacers on the front which have increased the front track by about 10mm. R888's fitted, so can try these. The Cup 1 Ali's are terribly heavy ---- even Porsche's own, so I don't want to use these. Hence the 18" BBS on which I had planed to fit R888's for track work --- it's all track work with a bit of road in between, but I have this almost new set of SO2's which have only done 1000 miles plus a Nurbugring trip --- So, the above wheels --- my SO2's to save cash or R888's to gain the real advantage of the 18" wheels ? Clubsport --- I'm glad you approve, yes they are the original set from a 2003 Boxster -- I'm trying to be practical ! And I think they look good !! Thanks for all your help ---
 
Chris, you mention real advantages of 18" wheels?.........They are not that that different in area of tyre on the track, personally I feel 964 drive fine on 17" and would have thought 17" 888 may be cheaper than 18"....just wondered what you felt the real advantage was?
 
At the time, 18" wheels were supposed to be worth a significant track time advantage --- I recall 2 seconds but without knowing the track this is meaningless. However, it does mean that I am not hammering my mags !! And the Cup2's belong to another car and weigh the same as the 18" Carreras, which are also better offsets.
 
ORIGINAL: ChrisW --- I recall 2 seconds but without knowing the track this is meaningless.
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Three seconds at the Wiessach test track on a 964 Cup Car running slix, actually..[8|] FFS, Chris, as if a few kilos of unsprung weight and some more grip are going to make ANY difference on a track day.....or have you other plans.....[;)]
 
ORIGINAL: Melv
ORIGINAL: ChrisW --- I recall 2 seconds but without knowing the track this is meaningless.
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Three seconds at the Wiessach test track on a 964 Cup Car running slix, actually..[8|] FFS, Chris, as if a few kilos of unsprung weight and some more grip are going to make ANY difference on a track day.....or have you other plans.....[;)]
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I'll have to learn to drive first ! So, R888's it is then ... [;)]
 
I am sure if the factory run 18"s as they did on later cups, then the geometry and spring rates would have been adjusted, particularly for the slicks which cups ran on. I will be amazed if 18"s make that much difference using the same settings. 888 are good, the only thing I am less happy with is the wear rate compared to previous Dunlop's I used, next time I have heard good reviews on the latest Dunlop direzza d03. When it's time for new rubber, with my ability and wallet, the tyre choice will most likely be down to the relative pricing and availability of various R tyres..
 
Well I'm confused. Are you saying you have bought 18" wheels but have 17" S02s and 17" PSCups? Sell me the PSCups and use the money to buy 18" 888's? Easy peasy.[;)] ....and you're wife likes the smell of rubber in the 'play room'....your just showing off now![:D][:D]
 
Jason, over the years I have accumulated lots of stuff. 17" Ali Cup 1's (from a 928) with SO2's Spare MOT failure but good set of 17" PS Cups Worn mags with new 17" PS Cups Good 17" Cup 2's with R888's (from a 968) BBS 18" wheels --- as seen Good set of 18" SO2's Plus the wheels/tyres on the cars ... ! Just too many options --- but I'd like to put the BBS on the N-GT for track days and keep the (to be refurbished again) good mags for best. Or I could create a spare set of 18" wheels with the SO2's for bad weather and use the worn but good 17" mags with PS Cups for track days ?? P.S. Rubber, better when hot !
 
i still want those MOT failure PS Cups Chris - my SSRs have had it! I'd like to try them before deciding whether to go with the new set I have or leave them on the mags as they are.
 
ORIGINAL: jason i still want those MOT failure PS Cups Chris - my SSRs have had it! I'd like to try them before deciding whether to go with the new set I have or leave them on the mags as they are.
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Jason, have them. I drive to and from the track on one set of wheels so if they are MOT failures before I start they should not be fit to drive back on --- though I feel they were a technical fail !! To where should I send them ? R888's just have --- so much more rubber on them ! And they warm up faster --- but they go off quicker --- so I am told !
 
Chris - what size tyre are you thinking of fitting to the wheels? As i recall 235's are too wide for 7.5" fronts (235's are ok on 7.5" 17" wheels). I have 2 set's of 8's and 9's made up from front 996/rear Boxster. I have D01J's on one set and DZ02's on the other, 235/40/18 front 265/35/18 rear - the rear tyres also are better suited to 10", but the 9" suit my 968 better. JP
 
Chris I have Front 235 and Rear 265 on 8 & 10" rims (993 fitment)....They do sound a little "over tyred " for the rims you are suggesting,,,,why go so wide?
 
For 235/40/18 the permitted rim size specified by the manufacturers (Toyo, Dunlop etc) is 8" to 9.5". Had a look at mine last night on 8" fronts - i wouldn't want to go any narrower than the 8", even at 8" it starts to look too narrow. JP
 
Good points and thanks for the essential input had I been buying new --- but they are the tyres I already have so I have fitted them, and will give them a try ... To be honest I hadn't considered that 235 might be slightly wide for 7.5" rims since 225's are regularly fitted, and 235/40's are right with 265/35's ... Only for road use anyway, so no heroics ... I will let you know how I get on !!
 
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