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Old 16-11-2008, 08:48 PM   #1
brad`
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Default 19" spare will it fit in spare tyre well

I was just woundering if a 19" with tyre would fit in the spare tyre well in a series 1 boot ?

cheers Brad`

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Old 16-11-2008, 09:50 PM   #2
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the rolling diameter is the same regardless of rim size,so yes it should fit.I have an 18 in mine with no probs
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Old 16-11-2008, 10:56 PM   #3
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my 20's dont fit in if its any help brad...
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Old 17-11-2008, 09:30 PM   #4
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haha so 18" do and 20" dont
lol so its a 50 - 50 split on if it will or not haha
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Old 18-11-2008, 09:54 PM   #5
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Well the 20 should - IF it has the correct size tyre fitted.

As was already said, the diameter of the wheel (rim with tyre fitted) should be constant and should fit in the well no probs.
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Old 18-11-2008, 09:59 PM   #6
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oh i get it now, sorry wasnt really thinking earlier just got in from work

should fit coz even if the rim gets bigger the tyre just gets smaller to make up for it..

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Old 18-11-2008, 11:39 PM   #7
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Originally Posted by T3man
Well the 20 should - IF it has the correct size tyre fitted.

As was already said, the diameter of the wheel (rim with tyre fitted) should be constant and should fit in the well no probs.
i don't believe so... well mine doesnt..
my stock were 215/55/16
the 20's are 225/35...

i dont believe you could keep the rolling diameter the same...by going 20's
may be wrong though..
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Old 19-11-2008, 12:24 AM   #8
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The correct size for your 20" rims is 225 30. Unfortunately not many manufacturers make this size (for sale in Austarlia) but they are definitely available if you shop around. I know for a fact that Kumho make them and there's probably others. They would be exactly the same as your originals. At present your speedo would be reading about 4% slow - not a good thing especially living in Victoria.

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Old 19-11-2008, 08:44 AM   #9
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Originally Posted by T3man
The correct size for your 20" rims is 225 30. Unfortunately not many manufacturers make this size (for sale in Austarlia) but they are definitely available if you shop around. I know for a fact that Kumho make them and there's probably others. They would be exactly the same as your originals. At present your speedo would be reading about 4% slow - not a good thing especially living in Victoria.

even 225/30 is bigger than the rollin diameter of 215/55/16... just the 20 inch wheel alone is almost as big as a 16 inch with a tyre...
its a pain in the butt...
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Old 19-11-2008, 01:10 PM   #10
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Quote:
Originally Posted by KR1STO
even 225/30 is bigger than the rollin diameter of 215/55/16... just the 20 inch wheel alone is almost as big as a 16 inch with a tyre...
its a pain in the butt...
How do you work that out? Check your info before posting. A 16" rim with a 215/55/16 has a rolling diameter of 25.3" - not even close to being the same size as a 20" rim only. And with a 225/30 on it, the 20" wheel and tyre becomes.....wait for it.......rolling diameter of......wait.....wait.....25.3" (same as the 16" rim/tyre combo in case you couldn't work that out)

A 20" rim with the correct size tyre, or a 19" with the correct size tyre, or a 16" with the correct size tyre are all effectively the same diameter and will fit in the spare wheel cavity. If the rim is larger than 7" wide though, it will stick up noticeably under the carpet.

Use http://www.miata.net/garage/tirecalc.html to check correct tyre sizes for different size rims. I usually do my comparison to a 225/50/16 or 235/45/17 as they were factory fitted tyre sizes on XRs.
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Old 19-11-2008, 01:16 PM   #11
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Quote:
Originally Posted by JC
How do you work that out? Check your info before posting. A 16" rim with a 215/55/16 has a rolling diameter of 25.3" - not even close to being the same size as a 20" rim only. And with a 225/30 on it, the 20" wheel and tyre becomes.....wait for it.......rolling diameter of......wait.....wait.....25.3" (same as the 16" rim/tyre combo in case you couldn't work that out)

A 20" rim with the correct size tyre, or a 19" with the correct size tyre, or a 16" with the correct size tyre are all effectively the same diameter and will fit in the spare wheel cavity. If the rim is larger than 7" wide though, it will stick up noticeably under the carpet.

Use http://www.miata.net/garage/tirecalc.html to check correct tyre sizes for different size rims. I usually do my comparison to a 225/50/16 or 235/45/17 as they were factory fitted tyre sizes on XRs.
i understand all that.. if i put the 20 inch wheel with a tyre on it. next to the 16 inch wheel with a tyre on it, it is considerably higher... even with 225/30(i've had them both...) it does not fit in the spare wheel well... thats what we're talkin about here yeah...

i can post up pics if you like and we can go from there... i understand all the mathmatical sides of this but physically it turns out bigger...(just wont fit)
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Old 19-11-2008, 05:07 PM   #12
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Quote:
Originally Posted by KR1STO
i understand all that.. if i put the 20 inch wheel with a tyre on it. next to the 16 inch wheel with a tyre on it, it is considerably higher... even with 225/30(i've had them both...) it does not fit in the spare wheel well... thats what we're talkin about here yeah...

i can post up pics if you like and we can go from there... i understand all the mathmatical sides of this but physically it turns out bigger...(just wont fit)
You already said your tyre is a 225/35/20, which is way different to a 225/30/20, so no wonder it won't fit. If you had the correct sized tyre, it would fit, both mathematically, and physically.

Maths is not a mystery; in theory 2 + 2 = 4, and in practice, if you have 2 apples, and I give you 2 more, then you will have 4. Theory = reality. But you have an orange in the argument somewhere and you're treating it as an apple.
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Old 19-11-2008, 05:15 PM   #13
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my mates got 20's on his AU and i know for a fact they do fit in as we had a blow out and put his spare on and the 20 in the well
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Old 19-11-2008, 06:04 PM   #14
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Quote:
Originally Posted by JC
You already said your tyre is a 225/35/20, which is way different to a 225/30/20, so no wonder it won't fit. If you had the correct sized tyre, it would fit, both mathematically, and physically.

Maths is not a mystery; in theory 2 + 2 = 4, and in practice, if you have 2 apples, and I give you 2 more, then you will have 4. Theory = reality. But you have an orange in the argument somewhere and you're treating it as an apple.

mate, as i said.. i'm not doubting the maths... if you had read my post, it states that i had both 225/35 AND 225/30... no need to get smart.. the question was will it fit.. i've tried both 225/35 and 225/30 and they both don't fit...

so you know what you can do with your apples...

hope you take that as a joke... its the end of the day JC
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Old 19-11-2008, 06:06 PM   #15
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maybe the fairlanes are different, so it may fit in a falcon/fairmont...

just stating my situation..
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Old 19-11-2008, 06:52 PM   #16
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it is real simple as JC says if all things are equal it will fit . if you have illegal tyres ( incorrect diameter) they won't . also your speedo will be out but many don't care about this all that matters is it must look "fully sic". if you have the wrong tyres fitted insurance can wipe you too
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Old 19-11-2008, 08:49 PM   #17
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Quote:
Originally Posted by KR1STO
i understand all that.. if i put the 20 inch wheel with a tyre on it. next to the 16 inch wheel with a tyre on it, it is considerably higher... even with 225/30(i've had them both...) it does not fit in the spare wheel well... thats what we're talkin about here yeah...

i can post up pics if you like and we can go from there...
Yes please, pics would be good ...
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Old 19-11-2008, 09:32 PM   #18
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My 20's with 225/35's on them are actually 3mm smaller in rolling diameter then my standard 17's that came on my Ser3 220 Xr8. And my 225/35 fits in the tyre well just fine.
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Old 19-11-2008, 09:34 PM   #19
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By the way if you have 20's on an AU with 225's on the front there ILLEGAL anyway. Well in QLD anyway.
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Old 20-11-2008, 06:24 PM   #20
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n e way... besides being a funny read with everyone going at it.. really funny actually, the 19" do fit i just took it on my own put it in and well it fit, did stick up a little three the carpet, maybe 7 - 10mm

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Old 20-11-2008, 09:31 PM   #21
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Thought it would. My 20's just a tiny bit smaller in rolling diameter so just drops in nice. I thought it would fit.
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