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Danny

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Wigan, Greater Manchester
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Drives: 99 1.6 bora, 53 2.6 MV6

Re: OFFSETS
Reply #15 - 24. Sep 2007 at 22:22

no but he does have 18" alloys, if they're 18x8 like yours are, you should be ok with the same size tyres as his

if anything, having 225 instead of 235 will keep your speedo as close to accurate as possible, over 2.5% either way is illegal if i'm not mistaken

bare in mind your speedo should have been calibrated in line with the OEM alloys your car had from new

if you had 16s on 225/55/16 then your 235/40/18s are only 1.33% out which is fine, but 225/40/18 is 2.55% which is too much, you might be fine putting your existing tyres on the new wheels

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« Last Edit: 24. Sep 2007 at 22:25 by Danny »

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MikeDundee

Omega King

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Posts: 10127
Costa Del Peckham
Gender: male

Drives: Irmscher Omega 3.0 V6

Re: OFFSETS
Reply #16 - 24. Sep 2007 at 22:48

Quote:

no but he does have 18" alloys, if they're 18x8 like yours are, you should be ok with the same size tyres as his

if anything, having 225 instead of 235 will keep your speedo as close to accurate as possible, over 2.5% either way is illegal if i'm not mistaken

bare in mind your speedo should have been calibrated in line with the OEM alloys your car had from new

if you had 16s on 225/55/16 then your 235/40/18s are only 1.33% out which is fine, but 225/40/18 is 2.55% which is too much, you might be fine putting your existing tyres on the new wheels

Yeah just been looking at that on the carbible thingy, what a nuisance Undecided

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hotel21

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Doghouse
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Drives: into lamposts

Re: OFFSETS
Reply #17 - 24. Sep 2007 at 23:43

Mick - not looked at the carbible link so apologies if this is a repost....

tyre numerical sizes are a hybrid of 3 different units, ie
235 - is the size/width of the treadface in mm's.
45 - is the height of the sidewall as a %age of the treadwidth, ie 45% of 235mm or 105mm roughly.
17 - is the rim diameter in inches.

Therefore if you increase the diameter of the rim from 17 to 18 inches, you need to reduce the sidewall height (take a lower %age profile) to keep the same rolling diameter of the wheel and tyre. It gets further complicated by increasing the width of the tyre, obviously...... Sad

235/45/17 is effectively the same size as 265/35/18...... Shocked

If you check this link - http://www.miata.net/garage/tirecalc.html - it has a size calculator so you can add/exchange to your hearts content and still get the same rolling diameter and see how far out the speedo etc will be.... Thumbs Up!

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Tech 2 available in Scotland. click on ->

http://theboy.omegaowners.com

for prices.....

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Danny Omega Lord Offline BLACK 1.6 BORA SHAPED JETTA!! Posts: 7180 Wigan, Greater Manchester Gender: Drives: 99 1.6 bora, 53 2.6 MV6	Re: OFFSETS Reply #18 - 24. Sep 2007 at 23:54 but you want to make sure your tyres arent too wide for your arches
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MikeDundee

Omega King

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Posts: 10127
Costa Del Peckham
Gender: male

Drives: Irmscher Omega 3.0 V6

Re: OFFSETS
Reply #19 - 24. Sep 2007 at 23:57

hotel21 wrote on 24. Sep 2007 at 23:43:

Mick - not looked at the carbible link so apologies if this is a repost....

tyre numerical sizes are a hybrid of 3 different units, ie
235 - is the size/width of the treadface in mm's.
45 - is the height of the sidewall as a %age of the treadwidth, ie 45% of 235mm or 105mm roughly.
17 - is the rim diameter in inches.

Therefore if you increase the diameter of the rim from 17 to 18 inches, you need to reduce the sidewall height (take a lower %age profile) to keep the same rolling diameter of the wheel and tyre. It gets further complicated by increasing the width of the tyre, obviously...... Sad

235/45/17 is effectively the same size as 265/35/18...... Shocked

If you check this link - http://www.miata.net/garage/tirecalc.html - it has a size calculator so you can add/exchange to your hearts content and still get the same rolling diameter and see how far out the speedo etc will be.... Thumbs Up!

Cheers for that Thumbs Up!

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MikeDundee Omega King Offline avatar borrowed from DLK for a bit..... Posts: 10127 Costa Del Peckham Gender: Drives: Irmscher Omega 3.0 V6	Re: OFFSETS Reply #20 - 24. Sep 2007 at 23:58 Quote: but you want to make sure your tyres arent too wide for your arches no I don't think the arches are wide enough for the tyres
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Danny

Omega Lord

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BLACK 1.6 BORA SHAPED
JETTA!!

Posts: 7180
Wigan, Greater Manchester
Gender: male

Drives: 99 1.6 bora, 53 2.6 MV6

Re: OFFSETS
Reply #21 - 25. Sep 2007 at 00:02

MikeDundee wrote on 24. Sep 2007 at 23:58:

Quote:

but you want to make sure your tyres arent too wide for your arches Grin

no I don't think the arches are wide enough for the tyres Grin

unless you get greater offser, thus making your wkeels sit further out, giving room for a wider tyre, at least on the back, but a certain amount of wheel protrusion from the arches is also illegal i believe, and you wouldnt want wider front ones because you wouldn't be able to turn Cheesy

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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: OFFSETS Reply #22 - 25. Sep 2007 at 00:06 If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts .....
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Danny Omega Lord Offline BLACK 1.6 BORA SHAPED JETTA!! Posts: 7180 Wigan, Greater Manchester Gender: Drives: 99 1.6 bora, 53 2.6 MV6	Re: OFFSETS Reply #23 - 25. Sep 2007 at 00:07 always best to stick with standard tis cheaper on insurance
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MikeDundee Omega King Offline avatar borrowed from DLK for a bit..... Posts: 10127 Costa Del Peckham Gender: Drives: Irmscher Omega 3.0 V6	Re: OFFSETS Reply #24 - 25. Sep 2007 at 00:14 hotel21 wrote on 25. Sep 2007 at 00:06: If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts ..... According to Will-Floyd MBE the rims just purchased should be fine ....and if they're not i'll just blame Will, and then curse myself for a couple of weeks
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Danny

Omega Lord

Offline

BLACK 1.6 BORA SHAPED
JETTA!!

Posts: 7180
Wigan, Greater Manchester
Gender: male

Drives: 99 1.6 bora, 53 2.6 MV6

Re: OFFSETS
Reply #25 - 25. Sep 2007 at 06:13

MikeDundee wrote on 25. Sep 2007 at 00:14:

hotel21 wrote on 25. Sep 2007 at 00:06:

If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts Cry

.....

According to Will-Floyd MBE the rims just purchased should be fine Thumbs Up!

....and if they're not i'll just blame Will, and then curse myself for a couple of weeks Grin

then i shall take this opportunity to point out that you bought the wheels before I said anything Thumbs Up!

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MikeDundee

Omega King

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avatar borrowed from DLK
for a bit.....

Posts: 10127
Costa Del Peckham
Gender: male

Drives: Irmscher Omega 3.0 V6

Re: OFFSETS
Reply #26 - 25. Sep 2007 at 07:54

Quote:

MikeDundee wrote on 25. Sep 2007 at 00:14:

hotel21 wrote on 25. Sep 2007 at 00:06:

If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts Cry

.....

According to Will-Floyd MBE the rims just purchased should be fine Thumbs Up!

....and if they're not i'll just blame Will, and then curse myself for a couple of weeks Grin

then i shall take this opportunity to point out that you bought the wheels before I said anything Thumbs Up!

I'll ask you first the next time Thumbs Up!

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Danny

Omega Lord

Offline

BLACK 1.6 BORA SHAPED
JETTA!!

Posts: 7180
Wigan, Greater Manchester
Gender: male

Drives: 99 1.6 bora, 53 2.6 MV6

Re: OFFSETS
Reply #27 - 25. Sep 2007 at 12:47

MikeDundee wrote on 25. Sep 2007 at 07:54:

Quote:

MikeDundee wrote on 25. Sep 2007 at 00:14:

hotel21 wrote on 25. Sep 2007 at 00:06:

If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts Cry

.....

According to Will-Floyd MBE the rims just purchased should be fine Thumbs Up!

....and if they're not i'll just blame Will, and then curse myself for a couple of weeks Grin

then i shall take this opportunity to point out that you bought the wheels before I said anything Thumbs Up!

I'll ask you first the next time Thumbs Up!

and if i'm not certain i'll just say i dont know Cheesy

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MikeDundee

Omega King

Offline

avatar borrowed from DLK
for a bit.....

Posts: 10127
Costa Del Peckham
Gender: male

Drives: Irmscher Omega 3.0 V6

Re: OFFSETS
Reply #28 - 25. Sep 2007 at 20:29

Quote:

MikeDundee wrote on 25. Sep 2007 at 07:54:

Quote:

MikeDundee wrote on 25. Sep 2007 at 00:14:

hotel21 wrote on 25. Sep 2007 at 00:06:

If the wrong offset with a wider profile tyre then the inner edge of the fronts connects with the struts Cry

.....

According to Will-Floyd MBE the rims just purchased should be fine Thumbs Up!

....and if they're not i'll just blame Will, and then curse myself for a couple of weeks Grin

then i shall take this opportunity to point out that you bought the wheels before I said anything Thumbs Up!

I'll ask you first the next time Thumbs Up!

and if i'm not certain i'll just say i dont know Cheesy

I never knew in the first place Undecided

...and am still uncertain Shocked

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