Mikeboy
Member
Registered: 12th Jun 02
Location: Wiltshire Drives: SXi DTi
User status: Offline
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Ive currently got standard 15" 7 spoke SXi alloys, with 185/55 tyres.
I want to get some new alloys, possibly the 16" SRi 5 spokes. If I wanted to keep the overall diameter of the wheel the same - what size tyres would I require ?
(I'm new to all this alloy + tyre business)
Also, are there any places online that sell tyres so I can get a rough idea of prices
Thanks
Mike
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edit
ok is this right?
The side wall height of my 185/55 tyres is 10.175 cm. 15" alloy is 38.10 cm.
So my overall wheel diameter is 58.45 cm ..
So if I got a 16" alloy, = 40.64 cm, that leaves 17.81 cm for the tyre.
So the side wall of the tyre would have to be 8.905 cm ?
What is the maximum width of a tyre you can fit on ?
Am I right in thinking I could get 200/45 tyres - thats a side wall hieght of 9 cm ... I think
So is that close enough to 8.9 cm ? Would it muck up my speedo etc ?
Or are my calculations completely wrong.
What would you alloy gurus advise in this situation.
Cheers, Mike
[Edited on 23-02-2003 by Mikeboy]
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Drew
Banned
Registered: 24th Nov 01
Location: County Durham
User status: Offline
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call any alloy tyre place, and they will tell ya the best size to get - got 16's on mine at min but cant remember size - u wont get an exact match in otherall diameter - just as close as possible which will make ya speedo a few mph out
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Tony
Member
Registered: 20th Jul 00
Location: South Africa
User status: Offline
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Hey Mike!
The correct configuration that you're looking for is 205/45 R16!
Cheers
Tony
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Mikeboy
Member
Registered: 12th Jun 02
Location: Wiltshire Drives: SXi DTi
User status: Offline
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Ahh, cool
Thanks both.
Ive got a better idea of what I want/need now when I make the decision 
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Jason Ling
Member
Registered: 30th Jan 03
Location: Manchester, Black Corsa C SXi
User status: Offline
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ask Makarus!
He believes its impossible to keep the overall diameter of wheel + tyres same when upping the wheel size. 
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Drew
Banned
Registered: 24th Nov 01
Location: County Durham
User status: Offline
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quote:
Originally posted by Jason Ling
ask Makarus!
He believes its impossible to keep the overall diameter of wheel + tyres same when upping the wheel size.
it is impossible
but ya just have to get as close as possible
why do 17's ect rub if ya could get the same overall diameter as a 14???
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TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Ahh yes but 15's with a profile of 45 are very close to the standard diameter of standard 13's with normal 'big' tyres.
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