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Old 05-15-2002, 06:52   #1 (permalink)
 
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AU 17" rubber dimensions

I just found out that the front and rear wheels on my car have different size rubber. front are 235/40 17 and rear are 235/45 17. which is the correct size for these wheels? the 45 series?
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Old 05-15-2002, 07:42   #2 (permalink)
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you can have wider tread.

on stock i was runnin 215's instead of 205s.. :p

wider it is, nicer it becomes in my personal opinion and feeling!
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Old 05-15-2002, 08:09   #3 (permalink)
 
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i'm not really concerned with the width as much as overall diameter, since the 45 series have a bigger diameter than the 40 series and it's quite noticeable
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Old 05-15-2002, 15:29   #4 (permalink)
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Its the 45 series that is correct.
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Old 05-15-2002, 17:14   #5 (permalink)
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What do you mean you only just noticed?

Yes 235/45/17 are the norm but even they are shorter (smaller dia) than other standard fitments.

Thoeretical diameters (in inches) are;

205/65/15 ~ 25.5"
215/60/16 ~ 26.1"
235/45/17 ~ 25.3"

and

235/40/17 ~ 24.4"

BTW that's why Falcons with 17" look like 4WD's at standard ride height. The shorter tires open up the gap between the top of the tire and the wheel arch.
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Old 05-15-2002, 17:24   #6 (permalink)
 
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Quote:
Originally posted by RAPTOR
What do you mean you only just noticed?
i didn't pay much attention to tyres when i first bought the wheels. whereas there was no gap between the wheel and the wheelarch before, there is one now.

thanks guys!
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Old 05-16-2002, 03:01   #7 (permalink)
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Just remenber that for every 10mm wider go 5 lower on profile
ie 225/50/16
235/45/17 etc
and the opposite the other way
ie 225/50/16
215/55/15
This keeps the overall diameter correct.
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Old 05-16-2002, 18:54   #8 (permalink)
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Quote:
Originally posted by sjwau2xr6
Just remenber that for every 10mm wider go 5 lower on profile.
This keeps the overall diameter correct.
Ummm, sorry to be so pedantic but no it doesn't.

What you are saying is take 10% of the section width
(ie. your 5% lower on profile, noting that there is section width at the top and bottom of the tyre) regardless of the section width for every 1" (25.4mm) change in wheel diamter.
It only works at a constant 254mm section width.

Try the maths;
((section width)x(aspect ratio)/100x2) + ((wheel dia. in inches)x25.4)
which gives the theoretical diameter in mm.

For example, if these sizes existed;

254/35/18
254/40/17
254/45/16
254/50/15
254/55/14
254/60/13

they all would have a theoretical 635mm overall diameter, which would be OK on a Falcon, although a bit shorter than standard.
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Old 05-16-2002, 19:52   #9 (permalink)
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Using Excel spreadsheet here is a chart of very similar tyre sizes (rounded to standard aspect ratios, and based upon the old 205/65/15 std falcon , before they came out with 16's as stock)

Width Aspect Diameter Rolling Diameter
205 65% 15 648
205 60% 16 652
215 55% 16 643
225 55% 16 654
235 50% 16 641
245 50% 16 651
255 45% 16 636
265 45% 16 645
275 45% 16 654
285 40% 16 634
215 50% 17 647
225 50% 17 657
235 45% 17 643
245 45% 17 652
255 40% 17 636
265 40% 17 644
275 40% 17 652
285 40% 17 660
215 45% 18 651
225 40% 18 637
235 40% 18 645
245 40% 18 653
255 35% 18 636
265 35% 18 643
275 35% 18 650
285 35% 18 657
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Old 05-16-2002, 20:26   #10 (permalink)
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Jesmol, looks like you go shopping for new tyre sizes the same way I do.

I am just sick-to-death of dumbass tyre salesman telling me things like:
"That sizes won't fit your car ..."
"You don't understand the Plus-1 principal ..."
"Your gearing will be thrown out ....."
etc etc.

When in reality they know SFA!
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