Tire Sizes - Again 205/255 is the right setup!?
09-16-2004, 04:35 PM
#31
Their recommendations are based on two things
1) Things they 100% KNOW will fit (they dont do fantasy fitments, they have actually fitted it if they recommend it)
2) What wheels they sell that they KNOW will fit. Most people would be putting Boxster or 993 wheels with a 7" front. Therefore, the 205/50R17 recommendation.
The 225/45R17 not only fits better but looks better on the wheel. However, they stay away from liability as much as possible. BTW, the sizes they recommend are, go figure, stock Boxster sizes. 205/50R17 and 255/40R17.
Mike, that is the setup I will run until I can have a wider rear wheel custom made.
Lastly, caster is a angle for alignment; castor is the nasty oil that people used to like to drink to settle stomachs
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1) Things they 100% KNOW will fit (they dont do fantasy fitments, they have actually fitted it if they recommend it)
2) What wheels they sell that they KNOW will fit. Most people would be putting Boxster or 993 wheels with a 7" front. Therefore, the 205/50R17 recommendation.
The 225/45R17 not only fits better but looks better on the wheel. However, they stay away from liability as much as possible. BTW, the sizes they recommend are, go figure, stock Boxster sizes. 205/50R17 and 255/40R17.
Mike, that is the setup I will run until I can have a wider rear wheel custom made.
Lastly, caster is a angle for alignment; castor is the nasty oil that people used to like to drink to settle stomachs
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09-17-2004, 02:25 AM
#32
Drifting
245/45/18 front 275/40/18 rear. Looks good. I have 205/50/15 225/50/15 largely because I don't have the $$ for 17 or 18 inch wheels. If you are looking for street tires, PM me, I'll make you a good deal on them and ship them to you. Or call me 281 370 8333.
09-17-2004, 03:10 AM
#33
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I'm also about to buy some tires for my C2 7x16/8x16 wheels and I was going to go with 205/55-16 + 225/50-16 (bridgestone re750 probably)
i guess there really isnt anything better for this wheel combo (stock 968 wheels) eh?
i guess there really isnt anything better for this wheel combo (stock 968 wheels) eh?
09-17-2004, 10:49 AM
#34
225/50/16 and 245/45/16
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09-17-2004, 02:05 PM
#35
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Originally Posted by bader$
Will a 8 inch d90 fit the front?
Anyone try this combo??
09-18-2004, 12:48 AM
#36
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Matt:
doesnt it matter that with 225/50+245/45 the radius of the front is .3" larger resulting in about 10 more rpm? or is that just stupid to worry about?
oh yea, also wheels that wide in the front are pretty bad for snow eh? i know these arent snow tires.. but i do live in the north-east.
doesnt it matter that with 225/50+245/45 the radius of the front is .3" larger resulting in about 10 more rpm? or is that just stupid to worry about?
oh yea, also wheels that wide in the front are pretty bad for snow eh? i know these arent snow tires.. but i do live in the north-east.
09-18-2004, 01:19 AM
#39
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http://www.bridgestonetire.com/dpp/s...productid=1075
bridgestone says so. but im sure i can do a calculation to prove it?
and i didnt say the fronts are larger, they arent, heh, but theyre larger than the stock wheels, and i think theyll be a bit sledlike in snow.. they are the steering wheels afterall.
bridgestone says so. but im sure i can do a calculation to prove it?
and i didnt say the fronts are larger, they arent, heh, but theyre larger than the stock wheels, and i think theyll be a bit sledlike in snow.. they are the steering wheels afterall.
09-18-2004, 06:44 AM
#40
Just got a set of Fuzion's mounted on my new rims last night. Don't have them on the car yet, they are 225/50-16 245/45-16's. Look AWSOME!!! Was going to use 205/225's but Travis talked me into the slightly larger size. WOW do they look good on my new (it's a secret) wheels. Will post pics as soon as I get them on. My local Bridgestone/Firestone store did me good on the price. Actually cheaper than Tire Rack, if you take into account shipping, having them mounted and balanced. I can hardly wait to try them. Got to work today tho so will swap them this afternoon.
Later all,
Bill
Later all,
Bill
09-18-2004, 09:39 AM
#41
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a 225/50/16 is 24.68" RD
a 245/45/16 is 24.86" RD
a 255/40/17 is 25.03" RD
a 225/45/17 is 24.97" RD
a 205/55/16 is 24.88" RD
This is in a perfect world.... So, the dif for Turbo S sizes is REALLY .18"- BUT, as I said, in a perfect world.... It VARIES from manufacturer to manufacturer, so, don't worry about it- even still .18" won't matter... I have 255/40/17 & can't tell the dif in acceleration, etc & THAT is the driven wheels & is REALLY .35" taller, so, it should slow it down slightly- I wanted taller gearing anyway, but, again, I can't tell the dif- of course, I did save ~1lb per wheel, so, maybe it evens out...?
I REALLY want an S2 5th to have a top gear capable of ~181... THEN, I'll need the mods to do it.... 
SEveral points- STOCK Turbo S had a 16x7 front w/225/50/16 & 16X9 rear w/245/45/16. The 9" wheel was TOO wide for the tire- the front was PERFECT from a looks perspective, but, some tire gurus suggest an extra 1/2" or so of wheel to back up the tire better- it's SUPPOSED to provide more stability. That 9" wheel looks a little silly w/that 245- REALLY needs AT LEAST 10mm- preferably 20mm. The 968 option went to 17x7.5 w/225/45/17 & 17x9 w/255/40/17, so, Porsche must have thought the same thing- they DID stiffen the rear of the 968 w/the helper springs (M030) & beefier sway (968 M030 was better than Turbo S M030), plus, the 968 had better weight dist- 49/51 vs 51/49.
Rich mentioned a general rule of thumb for sizes- these are general, as an 8" wheel for a 225 sounds like way too much- BUT- it REALLY depends on the particular rims- I bought some Cup 2's- 17x7 front w/225/45/17 & 17x9 rear w/255/40/17- The michelin Pilot Sport PS2 255/40/17's were not ANY wider than the 245/45/16 Dunlop SP8000's- this upset me a little... Anyway, several people told me I needed 205's for the 7" fronts, &, that the Club Sports that I HAD wereREALLy larger than 7", but, they were WRONG all the way around- my tire guy measured BOTH rims- they were almost identical- the OUTER beaded edge of the CS is wider though, & is therefore misleading... Tom Pultz has a GREAT website for his 944 S2- he went w/205's for the front at some point- he chronicals his various wheels, etc on his site- he noticed the lack of turn-in response & poorer braking traction, etc- he went to larger fronts- evually went to 18" Hollow Spokes...
I think the perfect combo would be some nice Fikse FM5's or Profile 13's(?) in 17x8.5 front w/245/45/17 w/an 18x10 rear w/285/35/18- the profile's would be about perfect & the extra ~1" rear RD would help fill out that ugly-*** angle view from the rear- possibly the ONLY ugly view our cars has- it's a certain angle & makes the rear wheel look like it's too far inside the car- I ACTUALLY have 1/8" spacers on my car too...
As for Tire Rack- I have not been happy at ALL w/their info as of late- I've talked w/SEVERAL different people there & their lack of knowledge & their RUDE attitudes have really pissed me off- I've bought tires from them for over 10yrs & have gotten used to not even CHECKING anywhere else for prices, etc, as I had ALWAYS had great service, etc- next time, I'm planning to check around a little, as I MIGHT change where I do my business- it REALLY just depends on whom you talk too.... people are people- most like to think they know more than they really DO & even if NOT, many don't know the same things- hell, SOME of the Tire Rack guys are more into our cars & know them well- other's don't know the first thing about them- some are racers & some are everyday family drivers who never break the speed limit- it's a big place, so, you can imagine the varied responses you'll get...
LAST- several people told me that I would need spacer for my Cup 2's- they are REAL factory Cup 2's- the offset was a lower # than my Club Sports, &, if ANYTHING, I wanted the wheels to stick out a little more (the REARS that is)- I bought some 1/4" spacers & decided that they MIGHT not be big enough, so, I waited till I got the wheels just to see what I was up against, as I found that I would DEFINATELY need longer bolts for the 1/4" spacers- well, the Cup 2's stick out just fine- if ANYTHING, they stick out further than my CS's- they look great- my tire guy left the 1/8" spacer (I already had for my CS's) on the side of the car he was working on & I noticed it before getting my side done, SO, I ended up leaving the 1/8" spacers ON, &, it is about PERFECT- the ONLY thing I would like more is a larger REAR wheel & to SHAVE a FEW pounds off.... ;-) Anyway, my point is, you really need to check hte wheels for YOUR specific car- things aren't perfect- I would STILLL suggest a 225 front w/a 245 or 255 rear, no matter WHAT, UNLESS you want to run the same tires ALL the way around- not a bad idea- Danno says turn-in on his car is UNREAL- he has the same all round- PLUS, you can rotate your tires then, &, THAT WOULD be kinda cool....
a 245/45/16 is 24.86" RD
a 255/40/17 is 25.03" RD
a 225/45/17 is 24.97" RD
a 205/55/16 is 24.88" RD
This is in a perfect world.... So, the dif for Turbo S sizes is REALLY .18"- BUT, as I said, in a perfect world.... It VARIES from manufacturer to manufacturer, so, don't worry about it- even still .18" won't matter... I have 255/40/17 & can't tell the dif in acceleration, etc & THAT is the driven wheels & is REALLY .35" taller, so, it should slow it down slightly- I wanted taller gearing anyway, but, again, I can't tell the dif- of course, I did save ~1lb per wheel, so, maybe it evens out...?
I REALLY want an S2 5th to have a top gear capable of ~181... THEN, I'll need the mods to do it.... SEveral points- STOCK Turbo S had a 16x7 front w/225/50/16 & 16X9 rear w/245/45/16. The 9" wheel was TOO wide for the tire- the front was PERFECT from a looks perspective, but, some tire gurus suggest an extra 1/2" or so of wheel to back up the tire better- it's SUPPOSED to provide more stability. That 9" wheel looks a little silly w/that 245- REALLY needs AT LEAST 10mm- preferably 20mm. The 968 option went to 17x7.5 w/225/45/17 & 17x9 w/255/40/17, so, Porsche must have thought the same thing- they DID stiffen the rear of the 968 w/the helper springs (M030) & beefier sway (968 M030 was better than Turbo S M030), plus, the 968 had better weight dist- 49/51 vs 51/49.
Rich mentioned a general rule of thumb for sizes- these are general, as an 8" wheel for a 225 sounds like way too much- BUT- it REALLY depends on the particular rims- I bought some Cup 2's- 17x7 front w/225/45/17 & 17x9 rear w/255/40/17- The michelin Pilot Sport PS2 255/40/17's were not ANY wider than the 245/45/16 Dunlop SP8000's- this upset me a little... Anyway, several people told me I needed 205's for the 7" fronts, &, that the Club Sports that I HAD wereREALLy larger than 7", but, they were WRONG all the way around- my tire guy measured BOTH rims- they were almost identical- the OUTER beaded edge of the CS is wider though, & is therefore misleading... Tom Pultz has a GREAT website for his 944 S2- he went w/205's for the front at some point- he chronicals his various wheels, etc on his site- he noticed the lack of turn-in response & poorer braking traction, etc- he went to larger fronts- evually went to 18" Hollow Spokes...
I think the perfect combo would be some nice Fikse FM5's or Profile 13's(?) in 17x8.5 front w/245/45/17 w/an 18x10 rear w/285/35/18- the profile's would be about perfect & the extra ~1" rear RD would help fill out that ugly-*** angle view from the rear- possibly the ONLY ugly view our cars has- it's a certain angle & makes the rear wheel look like it's too far inside the car- I ACTUALLY have 1/8" spacers on my car too...
As for Tire Rack- I have not been happy at ALL w/their info as of late- I've talked w/SEVERAL different people there & their lack of knowledge & their RUDE attitudes have really pissed me off- I've bought tires from them for over 10yrs & have gotten used to not even CHECKING anywhere else for prices, etc, as I had ALWAYS had great service, etc- next time, I'm planning to check around a little, as I MIGHT change where I do my business- it REALLY just depends on whom you talk too.... people are people- most like to think they know more than they really DO & even if NOT, many don't know the same things- hell, SOME of the Tire Rack guys are more into our cars & know them well- other's don't know the first thing about them- some are racers & some are everyday family drivers who never break the speed limit- it's a big place, so, you can imagine the varied responses you'll get...
LAST- several people told me that I would need spacer for my Cup 2's- they are REAL factory Cup 2's- the offset was a lower # than my Club Sports, &, if ANYTHING, I wanted the wheels to stick out a little more (the REARS that is)- I bought some 1/4" spacers & decided that they MIGHT not be big enough, so, I waited till I got the wheels just to see what I was up against, as I found that I would DEFINATELY need longer bolts for the 1/4" spacers- well, the Cup 2's stick out just fine- if ANYTHING, they stick out further than my CS's- they look great- my tire guy left the 1/8" spacer (I already had for my CS's) on the side of the car he was working on & I noticed it before getting my side done, SO, I ended up leaving the 1/8" spacers ON, &, it is about PERFECT- the ONLY thing I would like more is a larger REAR wheel & to SHAVE a FEW pounds off.... ;-) Anyway, my point is, you really need to check hte wheels for YOUR specific car- things aren't perfect- I would STILLL suggest a 225 front w/a 245 or 255 rear, no matter WHAT, UNLESS you want to run the same tires ALL the way around- not a bad idea- Danno says turn-in on his car is UNREAL- he has the same all round- PLUS, you can rotate your tires then, &, THAT WOULD be kinda cool....
09-18-2004, 10:45 AM
#42
Operator - look up the difference between a 993TT front and rear tires overall diameter .3 doesnt matter.
No it wasnt, it is perfect for it. However, in this day and age people dont like the way it looks. In fact, it is ideal to have the tire on the small side for the wheel, there is less sidewall movement and the performance is better. i.e. the 205/50R17 on the 7" wheel is really more ideal than the 225/45R17, however the overall handling of the car is worse with it (due mostly to the weight distribution). If Porsche were making Boxster wheels for the 944 it is highly unlikely they would have a 2" front to rear width differential.
Not if the car has ABS it wouldnt be. While in this case it may be moot, the RD of the wheel/tire combo effects just about every computer system in the car, including the ABS if it is run off of wheel speed sensors. Further by raising the overall RD you are effectively changing the gearing and making the car slower.
They really dont have that many people working there but if you ask for Dean at ext. 346 you should be fine. I have known Dean as long as I have been in the tire business. A good guy who really knows tires.
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.3 doesnt matter.
The 9" wheel was TOO wide for the tire
the profile's would be about perfect & the extra ~1" rear RD would help fill out that ugly-*** angle view from the rear
hell, SOME of the Tire Rack guys are more into our cars & know them well- other's don't know the first thing about them- some are racers & some are everyday family drivers who never break the speed limit- it's a big place, so, you can imagine the varied responses you'll get...
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09-18-2004, 11:32 AM
#43
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Matt- as for the 9" wheel being too wide for 245mm tire- I am SPECIFICALLY talking about LOOKS! For performance, I DID mention that more wheel was supposed to be better, as it backs up more of the tire... ANOTHER thing to remember- AGAIN, I'm talking about the Turbo S & the Club Sport wheel in particular- the 7" front LOOKED perfect w/the 225- might have been a little small for that tire- Porsche MUST have thought so, as I also mentioned, w/the 968 M030- 7.5" w/the 225 & 255 for the 9"- do the math here: 16" CS's- the 7" wide front is ~175mm w/a 225mm tire- that's ~50mm (or 2") more tire than wheel! The 9" wide REAR is ~225mm & wears a 245- that's only ~20mm wider. 968 M030- the 7.5" is ~190mm wearing a 225 & a 9" wheel is ~225mm wearing a 255- this is MUCH more balanced w/the front tire ~35mm larger & the rear ~30mm larger- ALMOST PERFECT.... IF I could have had the Cup 2's in 7.5" (used) I would have- so, I keep telling myself that I saved ~1lb per wheel w/the slightly narrower wheel, AND, that the CS was 7" wide w/the same width tire- I'm happy w/them for the most part, but, don't plan to ever go back to stock wheels, as I can't get an 18" & a 17" mix that way in JUST the right sizes, plus, some of the good after market wheel would actually SAVE a couple pounds, even when going larger...
245's just do NOT NORMALLY fill 9" wheels out, but, on the Club Sport, it actually looked SILLY- A counter point, which YOU would know better than most (based on our many tire discussions) is it ALSO depends on the SPECIFIC tires & the SP8000 245 was WAY too small on that 9" CS, yet, it (245) was just as wide as the Pilot Sport 255! Now, Bridgestones (my NEXT tire for SURE- S03) MAY be wider(?).
As for the 285/35/18 rear- this is a 25.85RD (a 275/35/18 would be okay too IMO & would be slightly smaller at 25.58"). Anyway, I've heard things about the ABS being affected- would the 951's ABS be affected by this??? What would happen? Is there any way to get it adjusted to work w/a wheel that is close to 1" taller? As for acceleration, you ARE correct, however, I believe that shaving a couple pounds per wheel, ala Fikses, etc, would HELP to make up for that- I like tall gears anyway & a modded engine should well make up for it...
Next time I need tires, I'll ask for Dean when I call Tire Rack- I always thought they were pretty large, but, I guess it's all relative- it's possible I had talked to Dean a few times before, as I've ordered AT LEAST 10 total sets of tires from them over the years- most for my 89 Integra, but, still.... I was always happy w/them until this recent order...
Sorry this was so short- I need to work on filling my replies out a little better... ;-)
245's just do NOT NORMALLY fill 9" wheels out, but, on the Club Sport, it actually looked SILLY- A counter point, which YOU would know better than most (based on our many tire discussions) is it ALSO depends on the SPECIFIC tires & the SP8000 245 was WAY too small on that 9" CS, yet, it (245) was just as wide as the Pilot Sport 255! Now, Bridgestones (my NEXT tire for SURE- S03) MAY be wider(?).
As for the 285/35/18 rear- this is a 25.85RD (a 275/35/18 would be okay too IMO & would be slightly smaller at 25.58"). Anyway, I've heard things about the ABS being affected- would the 951's ABS be affected by this??? What would happen? Is there any way to get it adjusted to work w/a wheel that is close to 1" taller? As for acceleration, you ARE correct, however, I believe that shaving a couple pounds per wheel, ala Fikses, etc, would HELP to make up for that- I like tall gears anyway & a modded engine should well make up for it...
Next time I need tires, I'll ask for Dean when I call Tire Rack- I always thought they were pretty large, but, I guess it's all relative- it's possible I had talked to Dean a few times before, as I've ordered AT LEAST 10 total sets of tires from them over the years- most for my 89 Integra, but, still.... I was always happy w/them until this recent order...
Sorry this was so short- I need to work on filling my replies out a little better... ;-)
09-18-2004, 11:35 AM
#44
I am headed to Indy in about 5 minutes so I will only address one thing, it is a point to ponder. Width of a tire is measured sidewall to sidewall and has nothing to do with the tread width. When I get back this evening I will respond to the rest.
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09-18-2004, 11:51 AM
#45
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well, Cool. Thanks Matt.
I'm about to use that card you sent me ages ago.
Hey, stupid question: wheels can be balanced without being on the car right? I can just bring in the wheels and have the tires mounted and balanced at the Bridgestone/Firestone place and then mount them myself right?
What kind of extra balancing do they do when they're on the car?
I'm about to use that card you sent me ages ago.
Hey, stupid question: wheels can be balanced without being on the car right? I can just bring in the wheels and have the tires mounted and balanced at the Bridgestone/Firestone place and then mount them myself right?
What kind of extra balancing do they do when they're on the car?