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Also I called onlinetires today (June 6, 2013) and they said that the 265/45-16 is on back order for 4-5 weeks. Not sure if the sales guy was just reading from a screen of if he actually had the correct information...

ECSTA XS KU36 - OnlineTires.com

Old 06-06-2013, 12:31 PM
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Quote:
Originally Posted by C-Hero View Post
Found this thread while I was lamenting the lack of wide 16" rubber as I help a friend look for new tires for this Northstar Fiero build. Glad to know the Kumho XS 265/45-16 will fit on a 16x8.
I thought Kuhmo XS 265/45-16 was intended for 8.5-10 widths... But whatever, the trick now is to find any of them!
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85 Carrera Coupe, OBD-I 993 3.6 conversion w/(ever-increasing list of mods)óclosing in on 425,000 miles. So far, 100,000 on the 3.6. Mad Wasp (Benelli TnT 1130).
Old 06-06-2013, 12:35 PM
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BarryJB, on page1 and page2 user aschen talks about and then posts pics of the 265/45-16 mounted on a 16x8.

But yes you are correct the recommended width is 8.5-10, the Canadian site still has the info posted:
ECSTA XS KU36 - Kumho Tire Canada, Inc.
Old 06-06-2013, 12:50 PM
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Yep they are still working great on the 8" rim. I think the slightly bulged sidwall looks period correct. I would be tempted to buy a set of 16x10 rims if I thought these tires would be available for the next decade or so.
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Old 06-06-2013, 02:04 PM
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Ok guys, sorry to say but Kumho has confirmed the ECSTA XS KU36 265/45-16 is no longer in production and doesn't (at this time) have any direct replacements planned.

I called the US office and they said that they show the 265/45-16 as discontinued and none of their 3 main warehouses showed any stock.

I called the Canadian office and they said the tire was not discontinued but that their stock level had been set to 0 (so they would not be receiving any more in Canada).
Old 06-06-2013, 02:14 PM
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Quote:
Originally Posted by aschen View Post
Yep they are still working great on the 8" rim. I think the slightly bulged sidwall looks period correct. I would be tempted to buy a set of 16x10 rims if I thought these tires would be available for the next decade or so.
Quote:
Originally Posted by C-Hero View Post
BarryJB, on page1 and page2 user aschen talks about and then posts pics of the 265/45-16 mounted on a 16x8.

But yes you are correct the recommended width is 8.5-10, the Canadian site still has the info posted:
ECSTA XS KU36 - Kumho Tire Canada, Inc.
I think with 8s instead of 9s, they'd rub a little more often on my 911 - they already occasionally touch the hard oil lines rear right on my 3.6 conversion, although that's being remedied as we speak so the 17s will fit later. You probably have LOADS of room back there with a 930!

I'd love to fit 10s on the rear but with a narrow body, 9.5 is it for mine, and with the demise of the 265/45-16 (unless you want to go with the Kuhmo DOT track tires - I don't), it will be 275/40-17 on 9.5x17 and hope they keep making that size for a few more years than they did the 265/45-16! I have one new pair of XS left... there are a few sets to be found if you really hunt, but they are getting very scarce, no regular supplier has them. The 225/50-16 are still widely available for the fronts, at least...

Such great tires too. What gifts the gods giveth, they also apparently taketh away!
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85 Carrera Coupe, OBD-I 993 3.6 conversion w/(ever-increasing list of mods)óclosing in on 425,000 miles. So far, 100,000 on the 3.6. Mad Wasp (Benelli TnT 1130).
Old 06-06-2013, 02:30 PM
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I was checking out the Toyo site to compare diameters of 16, 17 and 18 inch, as I am trying to decide if I should get a set of 17 or 18 inch wheels.

I noticed they still offer TR1's hi perf street in 245 and 225 sizes, as well as DOT R RA-1's, so you do have a Toyo option, too. I have run Toyo for several years on 911 and now a 930, and have no complaints.

Proxes T1R | Toyo Tires
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1988 930 coupe - Silver Metallic
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Old 06-06-2013, 02:43 PM
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This is the main reason I went to the 18's. The price was right and I'm sure the sizes will be readily available for some time. I still have the 245/16's and Fuchs as spares. I couldn't imagine waiting around for a tire to come available if ever there was a tire issue.


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Old 06-08-2013, 06:16 AM
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Hankook also has 16's available. From what I can see the 225 sizes are offered in many options, while the 245 seems to be available in 50 profile which is a bit taller than ideal but not crazy.

The trick I see with the 17's and 18's is how to keep the diameter near stock, avoiding loss of acceleration and performance. Also, not sure whether there is an increase in rotating mass, etc. (since there is an extra inch or two of wheel mass) and whether this would also be a negative. I will have to check that out.
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1988 930 coupe - Silver Metallic
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Old 06-08-2013, 07:13 AM
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I think only a few versions/colors of older cars look right with any of the candidate 18's - your slant-nose probably one of them, Chris. But I don't think those new Porsche 18-in Fuchs will fit our older cars at all, if that's the desired esthetic, so it's Alton/Zuffenhause 17's or of course made-up 17-in wheels using old 16-in centers. Or I guess one could get 18in rims made up the same way... might not look so hot though.

I don't think 245s are much trouble to get... but no way I'm going backwards from my 265s!

But the rationale for going from 16 to 18 is undeniable.

Re possibilities, Timmins' Instant-g original detailed wheel fitment page was very helpful, however it looks like he may have replaced it (or I just didn't look hard enough) with a "Tire Diameters for Common Porsche Fitments" page which instead offers a quick reference for many of the outer tire diameters from 185/75-14 through 335/30-18.

Alternatively, there's a handy tire-diameter calculator on a Miata forum at Tire size calculator that also lets you compare two tire/wheel combos re diameter and effect on speedo.

Using that, the diameter of a 225/50-16 is 24.9in; a 245/50-16 is 25.6in; 3.2% increase; with 245 when speedo reads 60, you are doing 61.9... going to a 265/45-26 is actually less of an increase at 2.1% - 25.4in, at 60 you are doing 61.3.

Decisions, decisions...

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85 Carrera Coupe, OBD-I 993 3.6 conversion w/(ever-increasing list of mods)óclosing in on 425,000 miles. So far, 100,000 on the 3.6. Mad Wasp (Benelli TnT 1130).

Last edited by BarryJB; 06-08-2013 at 09:13 AM.. Reason: typo
Old 06-08-2013, 09:11 AM
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