Tyre size
Scooby Regular
Joined: Dec 2007
Posts: 6,284
Likes: 4
From: Scotland
Are they the same wheels I have - "view my scooby"?
I was wanting to know the exact same thing on here last week so take a look at my thread. Everyone basically said yes...you can either go for 205/45/17 or 215/40/17. I went for the latter and am waiting on getting my goodyears fitted over the next few days.
A wider tyre will have more grip as there is more rubber making contact with the tarmac. In the dry anyway, and to be honest these days you can get tyres that are very good at dispersing water so going wider wont affect wet performance too much.
Alan
I was wanting to know the exact same thing on here last week so take a look at my thread. Everyone basically said yes...you can either go for 205/45/17 or 215/40/17. I went for the latter and am waiting on getting my goodyears fitted over the next few days.
A wider tyre will have more grip as there is more rubber making contact with the tarmac. In the dry anyway, and to be honest these days you can get tyres that are very good at dispersing water so going wider wont affect wet performance too much.
Alan
Last edited by GlesgaKiss; Feb 23, 2008 at 10:57 AM.
Scooby Regular
Joined: Dec 2007
Posts: 6,284
Likes: 4
From: Scotland
Posted from way ... way back and occasionally useful to post again
"
Impreza (Classic) Tyres
The OEM 16x7in wheel comes with a 205/50x16 tyre. Wheel offset is 53mm.
Prodrive 17x7in wheels come with 205/45x17in Pirellis as they are their rally team sponsor. Wheel offset is 52mm. The tyre is nominally 0.8% larger circumference over OEM.
Most people fit 215/40x17 replacements as there is a much greater choice of good tyres in this size. It is nominally 1.2% smaller circumference.
A 215/45x17 tyre is nominally 2.3% larger circumference than 205/50x16.
Tyre sizes are nominal, not actual, and different brands can vary in width by 5mm or more on the same wheel. Fitting them to wider wheels, eg 7.5x17, will introduce further variation. When these factors are combined with after-market wheels with off-sets typically varying between 45mm and 52mm for Classic Scoobs, it explains why some people get rubbing on the outside rear arch while others don't.
The difference in circumference between a new tyre and a worn out tyre is less than 1%.
The SIDC faq is good, but not 100% correct and somewhat out of date, eg the Bridgestone SO-2pp has not been available for at least two years.
The Road Angel GPS speed camera detector shows actual speed. Some other similar devices are set to over-read slightly, ie they say you are going faster than you are. My speedo on a MY00 Classic over-reads by approx 10% at low speeds and 5% at high speeds.
If you fit 215/40x17 tyres to a 17x7in wheel with an off-set between 50-52mm, you will not have any problems on a Classic. If you fit 215/45x17 to the same wheel (note the off-set) you will be okay with rubbing, but you will have eaten into the safety margin provided by the speedo by 2.3%. Check it with a Road Angel to find the exact difference at various speeds so you are not caught out.
----
215/40/17 with ET48 can fit on a classic too
"
"
Impreza (Classic) Tyres
The OEM 16x7in wheel comes with a 205/50x16 tyre. Wheel offset is 53mm.
Prodrive 17x7in wheels come with 205/45x17in Pirellis as they are their rally team sponsor. Wheel offset is 52mm. The tyre is nominally 0.8% larger circumference over OEM.
Most people fit 215/40x17 replacements as there is a much greater choice of good tyres in this size. It is nominally 1.2% smaller circumference.
A 215/45x17 tyre is nominally 2.3% larger circumference than 205/50x16.
Tyre sizes are nominal, not actual, and different brands can vary in width by 5mm or more on the same wheel. Fitting them to wider wheels, eg 7.5x17, will introduce further variation. When these factors are combined with after-market wheels with off-sets typically varying between 45mm and 52mm for Classic Scoobs, it explains why some people get rubbing on the outside rear arch while others don't.
The difference in circumference between a new tyre and a worn out tyre is less than 1%.
The SIDC faq is good, but not 100% correct and somewhat out of date, eg the Bridgestone SO-2pp has not been available for at least two years.
The Road Angel GPS speed camera detector shows actual speed. Some other similar devices are set to over-read slightly, ie they say you are going faster than you are. My speedo on a MY00 Classic over-reads by approx 10% at low speeds and 5% at high speeds.
If you fit 215/40x17 tyres to a 17x7in wheel with an off-set between 50-52mm, you will not have any problems on a Classic. If you fit 215/45x17 to the same wheel (note the off-set) you will be okay with rubbing, but you will have eaten into the safety margin provided by the speedo by 2.3%. Check it with a Road Angel to find the exact difference at various speeds so you are not caught out.
----
215/40/17 with ET48 can fit on a classic too
"
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