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Post  Rocky34Ten 14/09/09, 09:29 pm

As i work with wheels all day i thought i would share something which would shed a bit of light..

tyres come in metric sizes (195/50/15)
25.45mm to an inch
so...
13" = 330.85mm
14" = 356.30mm
15" = 381.75mm
16" = 407.20mm
17" = 432.65mm (if anyone goes past a 16" on a swift = No tut tut)
18" = 458.10mm
19" = 483.55mm

right so theres your usual sizes converted from inch to mm.

next bit is rolling diameters of different tyre sizes of different size wheels:

13":
155/70 = 54.250mm = 385.100mm(15.13")
185/60 = 55.500mm = 386.350mm(15.18")

14"
185/55 = 50.875mm = 407.175mm(15.99")
195/50 = 48.750mm = 405.050mm(15.92")
195/45 = 43.875mm = 400.175mm(15.72")

15"
195/50 = 48.750mm = 430.500mm(16.91")
195/45 = 43.875mm = 425.625mm(16.72")

16"
195/45 = 43.875mm = 451.075mm(17.72")
205/40 = 41.000mm = 448.200mm(17.61")
195/40 = 39.000mm = 446.200mm(17.53")

17"
205/40 = 41.000mm = 473.650mm(18.61")

18"
215/35 = 37.625mm = 495.725mm(19.48")

19"
215/35 = 37.625mm = 521.175mm(20.48")

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Post  STEVEGTI 15/09/09, 02:26 pm

was you bored at work i take it

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Post  shuja 17/09/09, 05:24 pm

Okay. Lets test your knowledge on wheels.
I've got a mk2ph2 swift gti. I've bought 15" alloys with an offset of 32. I'm planning on putting 195/15/45 tyres on the wheels. Will these fit OK without modding the arches? I know the swift is meant to have an offset of 45. Can you tell me what problems I might face using wheels of an incorrect offset.

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Post  STEVEGTI 17/09/09, 05:48 pm

rubbing thats about it mate 32 offset should be fine dont go gor 195 45 get a 50 much better

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Post  shuja 18/09/09, 10:29 pm

Since I'm folding my arches there should'nt be a problem right? And what advantage will I get using 50 profile, does'nt that give it more chance to rub?

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Post  dominator 19/09/09, 10:50 am

i think he means on the inner arches mate
i have that problem wiv my r888`s but they are 205 50 15 Very Happy
you can beat the inner arch in a bit with a mallet but on the nearside part of the bulkhead is behind the arch so you wont get much clearance on that side

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Post  STEVEGTI 19/09/09, 03:43 pm

50 is a low profile as it is 45s are way too low you need the flex to get traction by the time you get konis springs poly bushes struts etc it will be too stiff on 45s
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Post  shuja 19/09/09, 06:26 pm

dominator wrote:i think he means on the inner arches mate
i have that problem wiv my r888`s but they are 205 50 15 Very Happy
you can beat the inner arch in a bit with a mallet but on the nearside part of the bulkhead is behind the arch so you wont get much clearance on that side

gary

Because I'm only going to have 195's does that mean I won't have to beat in the arches? I really don't want to do that as I have just fully resprayed the underneath.

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Post  dominator 20/09/09, 11:50 am

my 195 50 15 road tyres rub slightly on full lock, but thats only because of the offset and also becuse of the hidden bulkhead, drivers side clears just fine
you could get some wheels that has enough offset to clear the inner arch but it will mess up the handling of the car, its a visious circle realy
if you use a good nylon/wood mallet it wont effect the paint work on the inner the arch, but if you also have to roll the arches then that will
im surprized your sprayer didnt ask if you wanted the arches rolled before he sprayed it Suspect

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Post  shuja 24/09/09, 05:18 pm

Ok. If its going to rub on the inner part, what if I have 195/15/50, and put a 5mm spacer with my arches folded. Will it clear the arch and the inside of the car? By the way, what is the maximum size spacer you can use on standard bolts before it becomes too dangerous and you do not have enough thread left?

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Post  STEVEGTI 24/09/09, 07:28 pm

i think you will be lucky to get a 5mm spacer on there im running 195/50/15 on a r888 and they dont rub its all about the suspension

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Post  dominator 24/09/09, 07:37 pm

yeah, i did forget to say that im using 1.7 deg camber and 4.5 deg of castor Embarassed
the amount of spacer you can use all depends on how deep the holes are in the alloy wheel

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Post  STEVEGTI 24/09/09, 07:51 pm

as dominator said th thickness of the wheel needs to be taken into account there are too many factors that need to be looked at before you can achieve a yes or no style aswer

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Post  stevieh6 28/10/09, 03:13 pm

what profile would you recommend for 14" wheels on the gti?
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Post  shuja 28/10/09, 08:50 pm

I had 14" on mine and they looked brilliant with a 60 profile. I've still got them if your interested in buying them. They're old skool 5 spoke rimstocks.

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Post  stevieh6 29/10/09, 12:46 pm

how wide are they? what do they weigh with the tyre on? do you have a pic?

60 profile is too big though in my opinion
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Post  shuja 29/10/09, 03:14 pm

I can't remember the full specs of the wheel and they are on my vehicle at the moment until I put my new ones on. There is a pic with of my car with the wheels on in the introduce yourself section. In that pis the car is lowered 40mm and the wheels have a 60 profile.

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Post  Almondo74 08/11/09, 02:36 pm

does any1 no wot length the standard wheel studs are cus i took my wheels off earlier and the nuts are only on by about 5 or 6 turns(1/4 to 1/2 inch), so im goin 2 get sum longer studs,

i found in the manual there M12x1.25 but couldnt find the length and i dont really wanna take mine apart 2 find out.

Cheers

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Post  dominator 08/11/09, 09:25 pm

why dont you just take the wheel off and messure them scratch

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Post  Almondo74 08/11/09, 09:27 pm

thats only the thread the total length would b in the disc aswell,

but i just had a gd search on redline and found it, so it doesnt matter now,

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