Bigger tyre widths on standard rim's
22 August 2006, 02:39 AM
#1
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Advice Please: Larger tyres on standard rim's
I got a 02 bugeye, with standard 17's on it, running 215x45x17's.
Are the standard scoob wheels capable of taking 225x45x17's or is that not be recomended???
There does not appear to be that much of a difference between the 2 sizes, but then again i know jack sh*t !
Got this info from http://www.1010tires.com/TireSizeCalculator.asp
Stock Tire - 215/45R17
Section Width:8.46 in / 215 mm
Rim Diameter:17 in / 431.8 mm
Rim Width Range:7 - 8 in
Overall Diameter:24.61 in / 625.09 mm
Sidewall Height:3.80 in / 96.52 mm
Radius:12.30 in / 312.42 mm
Circumference:77.31 in / 1963.6 mm
Revs per Mile:845.1
Stock Tire - 225/45R17
Section Width:8.85 in / 225 mm
Rim Diameter:17 in / 431.8 mm
Rim Width Range:7 - 8.5 in
Overall Diameter:24.97 in / 634.23 mm
Sidewall Height:3.98 in / 101.09 mm
Radius:12.48 in / 316.99 mm
Circumference:78.44 in / 1992.3 mm
Revs per Mile:832.9
Are the standard scoob wheels capable of taking 225x45x17's or is that not be recomended???
There does not appear to be that much of a difference between the 2 sizes, but then again i know jack sh*t !
Got this info from http://www.1010tires.com/TireSizeCalculator.asp
Stock Tire - 215/45R17
Section Width:8.46 in / 215 mm
Rim Diameter:17 in / 431.8 mm
Rim Width Range:7 - 8 in
Overall Diameter:24.61 in / 625.09 mm
Sidewall Height:3.80 in / 96.52 mm
Radius:12.30 in / 312.42 mm
Circumference:77.31 in / 1963.6 mm
Revs per Mile:845.1
Stock Tire - 225/45R17
Section Width:8.85 in / 225 mm
Rim Diameter:17 in / 431.8 mm
Rim Width Range:7 - 8.5 in
Overall Diameter:24.97 in / 634.23 mm
Sidewall Height:3.98 in / 101.09 mm
Radius:12.48 in / 316.99 mm
Circumference:78.44 in / 1992.3 mm
Revs per Mile:832.9
Last edited by W00DY; 22 August 2006 at 06:07 PM. Reason: Updating post
23 August 2006, 11:21 AM
#2
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I had 205/45R17 tyres on my P1 and swapped onto for 215/40R17 and had no problems at all - if anythng the car handled better on the 40 profiles.
both tyre sizes went 16,000miles before changing so the difference in rolling radius had little impact on the distance they covered - just threw the speedo out a little - but hey that wasn't that important to me.
just my 2peneth
Good Luck whatever you choose to do.
Rob
both tyre sizes went 16,000miles before changing so the difference in rolling radius had little impact on the distance they covered - just threw the speedo out a little - but hey that wasn't that important to me.
just my 2peneth
Good Luck whatever you choose to do.
Rob
24 August 2006, 01:46 AM
#3
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you'l be fine going to 225/45/r17 as i understand it wheel size has to be kept as near as pos to the original over all size which on yours is 618.5mm and the 225/45 tyre would make that 627.5mm which is exceptable as it under 1cm out.
28 August 2006, 07:08 AM
#4
I have this bit of text copied from an old post that is useful.
"
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.
"
"
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.
"
28 August 2006, 08:05 AM
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As per the tyre manufacturers you can fit the 225/45 to a 7" rim, as their specs state (generally) that the tyre will fit a 7" to 8.5" rim.
If you know the brand and model of tyre you are planning to use, check on http://www.tirerack.com/ for the spec of the tyre. An example for the Goodyear Eagle F1 GS-D3 is http://www.tirerack.com/tires/Spec.j...1=yes&place=25
I run 225/45 tyres for trackdays, but due to the stresses these tyres will be under I went with a cheap set of Rota rims in 7.5" to meet the 'sweetspot' the tyre manufacturer recommended (Bridgestone RE55S in my case)
As stated above be careful with the 'actual' tyre width for a 225 as manufacturers seem to vary.
Also be careful with trackday tyres, as the measurements there are not made in the same way as for 'street' tyres - and the trackday tyres end up wider!
Neil
If you know the brand and model of tyre you are planning to use, check on http://www.tirerack.com/ for the spec of the tyre. An example for the Goodyear Eagle F1 GS-D3 is http://www.tirerack.com/tires/Spec.j...1=yes&place=25
I run 225/45 tyres for trackdays, but due to the stresses these tyres will be under I went with a cheap set of Rota rims in 7.5" to meet the 'sweetspot' the tyre manufacturer recommended (Bridgestone RE55S in my case)
As stated above be careful with the 'actual' tyre width for a 225 as manufacturers seem to vary.
Also be careful with trackday tyres, as the measurements there are not made in the same way as for 'street' tyres - and the trackday tyres end up wider!
Neil
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