Snow Tire Sizing 17s
10-12-2014, 06:18 PM
#31
8" is the best rim width choice for a 235 Blizzak tire. For the Blizzak WS80 in the 235/45R17 size for example, Rim Width Range is 7.5"-9" Meas. Rim Width is 8".
So 9" is acceptable for that size tire, but 8" is optimum.
Click Specs for more.
http://www.tirerack.com/tires/tires....=Blizzak+WS80#
So 9" is acceptable for that size tire, but 8" is optimum.
Click Specs for more.
http://www.tirerack.com/tires/tires....=Blizzak+WS80#
10-12-2014, 07:23 PM
#32
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If you look at those specs, the 235 tires have "Measured Rims" down to 7" for 235/65-17 as an example. If you look at the definition of a "Measured Rim" here: http://www.tirerack.com/tires/tirete...jsp?techid=199 it's simply a rim that industry uses to mount the tire to prove that a given tire meet dimensions as advertised. It is not the rim that is recommended.
Recommended rims for this this particular Blizzak is 7.5" to 9". What would be important to see is the mounting section width of this tire, which TireRack did not publish. At least that's the way I read tire/wheel combos.
Specifically, for the tire that BtB wrote about, the specs are here. 235/45-17 are shown with recommended 7.5" - 9" and measured rim at 8". The cross section is shown at 9.3" so the measured outside to outside sidewalls, when mounted on 8" rim, is about 10". Again, I would personally use 9" wheel for that cross-section tire, but 8", I'm sure, is also fine.
Just for comparison, not apples to apples, but because there're tons of emerical evidence on this, I run this tire in 257/35-13 on the race car: http://www.tirerack.com/tires/tires....R5A6&tab=Specs It shows measure rim at 9.5", recommended rims of 9-11" and cross section of 10.8". It has been proven well beyond any doubt that it works better on 10" rim than 9" or 9.5" and would work even better on 11" rim if it could fit the car's suspension (it can't).
So, just FYI, again, I think this is fairly moot for winter tires
Recommended rims for this this particular Blizzak is 7.5" to 9". What would be important to see is the mounting section width of this tire, which TireRack did not publish. At least that's the way I read tire/wheel combos.
Specifically, for the tire that BtB wrote about, the specs are here. 235/45-17 are shown with recommended 7.5" - 9" and measured rim at 8". The cross section is shown at 9.3" so the measured outside to outside sidewalls, when mounted on 8" rim, is about 10". Again, I would personally use 9" wheel for that cross-section tire, but 8", I'm sure, is also fine.
Just for comparison, not apples to apples, but because there're tons of emerical evidence on this, I run this tire in 257/35-13 on the race car: http://www.tirerack.com/tires/tires....R5A6&tab=Specs It shows measure rim at 9.5", recommended rims of 9-11" and cross section of 10.8". It has been proven well beyond any doubt that it works better on 10" rim than 9" or 9.5" and would work even better on 11" rim if it could fit the car's suspension (it can't).
So, just FYI, again, I think this is fairly moot for winter tires
10-12-2014, 07:52 PM
#33
Look up HTRZ-III or AD08 or PSS in 235/45R17. They all have the same specs as the WS80 with regard to rim width.
Measuring Rim Width for all four tires is 8".
As I said, 9" is acceptable for that size tire, but 8" is optimum.
Measuring Rim Width for all four tires is 8".
Tire Specs Explained: Measuring Rim Width
The measuring rim width is the industry standardized rim width upon which the tire must be mounted in order to confirm it meets its dimensional targets. Because the width of the rim will influence the width of the tire, a standard rim width for every tire size is assigned and must be used. This standardized measuring rim width allows all of the tires produced around the world to meet the same dimensional standards and therefore, be equivalent with regards to their physical size. The measuring rim width is sometimes referred to as the tire's "design rim width."
The assigned measuring rim width changes with the tire size's section width and with the tire size's aspect ratio. As tire section width increases, the measuring rim width increases proportionately in 1/2" increments. Therefore, relatively narrow wheel widths are assigned for smaller tires while wider wheel widths are assigned for larger tires.
Additionally, relatively "narrow" measuring wheel widths are assigned for taller profile tires (75-series sizes) which graduate in 1/2" increments to the wider wheel widths assigned for lower profile tires (40-series sizes).
http://www.tirerack.com/tires/tirete...jsp?techid=199
The measuring rim width is the industry standardized rim width upon which the tire must be mounted in order to confirm it meets its dimensional targets. Because the width of the rim will influence the width of the tire, a standard rim width for every tire size is assigned and must be used. This standardized measuring rim width allows all of the tires produced around the world to meet the same dimensional standards and therefore, be equivalent with regards to their physical size. The measuring rim width is sometimes referred to as the tire's "design rim width."
The assigned measuring rim width changes with the tire size's section width and with the tire size's aspect ratio. As tire section width increases, the measuring rim width increases proportionately in 1/2" increments. Therefore, relatively narrow wheel widths are assigned for smaller tires while wider wheel widths are assigned for larger tires.
Additionally, relatively "narrow" measuring wheel widths are assigned for taller profile tires (75-series sizes) which graduate in 1/2" increments to the wider wheel widths assigned for lower profile tires (40-series sizes).
http://www.tirerack.com/tires/tirete...jsp?techid=199
10-12-2014, 07:57 PM
#34
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Mongrel the way I've always rad this is that measured rim _is not_ the recommended rim size. Tire meets dimensional target != the right rim size for that tire.
Last edited by nile13; 10-12-2014 at 09:17 PM.
10-13-2014, 03:53 PM
#35
For the past 14 years during the winter I've kept my 993 covered in the garage with a trickle charger with no problems. Just make sure the battery fluid is topped off with distilled water. And to protect the tires from flat spotting, I fill them to 45-50psi, and also turn them a few times to vary what part contacts the ground.
10-14-2014, 10:04 AM
#36
Burning Brakes
Apologies for the tangential questions, but how does a 993 hold up in a NE winter vs the salt? Like 99er, the 993 c2s stays in even when it rains and the 335xi comes out. But, I do spend an inordinate amount of time mapping out scenarios where a 993 C4 would take the place of the 335xi workhorse. Also, why do we need heated storage space? I run a dehumidifier year round, but what's wrong with NJ cold winters?
10-14-2014, 02:48 PM
#37
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Not sure what you mean by downside. To check or fill it, just pop the caps off your battery, shine a flash light into it. You want to make sure the plates are fully covered with distilled water.
10-21-2014, 07:52 AM
#39
Sorry if this topic has been around, but I haven't found it answered in search. I just purchased a 993, but am looking for winter tires to get the car out once in a while in the cold months. My BMW rotted away in these months with summer tires, and I don't want the same to happen to this car.
So, with the standard 17's, it seems snow tires aren't made for 255/40. The closest option seems to be 245/40/17 which makes the overall diameter of the tire .3" smaller.
So, with the standard 17's, it seems snow tires aren't made for 255/40. The closest option seems to be 245/40/17 which makes the overall diameter of the tire .3" smaller.
http://bethnrayndogs.com/car_docs/Po...roup4_1-98.pdf
I would source some cheap Boxster 986 17x7J and 8,5J rims, and fit 205/50 225/45 winter tires.
Last edited by orangecurry; 10-21-2014 at 07:58 AM. Reason: fat fingers
12-03-2014, 07:17 PM
#40
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From CarAndDriver.com's "Epic Snowstorm Couldn’t Stop This Man and His 560-hp ’81 911:"
Before & after
Roof autographed by Porsche racing drivers Jürgen Barth, Jochen Mass, Kees Nierop, Altfrid Heger ... & Old Man Winter:
By Canadian standards, it was just a light dusting
12-06-2014, 12:03 PM
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There's a MY96 C4S here in Vail, CO living its entire life in the snow. Having run into the owner he treats the coupe to new M/S tires from time to time and runs the standard C4S OEM 18" turbo twist rim size.
It's cool to see the coupe running around town in the snow... And there are others.
For us it's why there are Subaru Outbacks ....
It's cool to see the coupe running around town in the snow... And there are others.
For us it's why there are Subaru Outbacks ....