Author Topic: how do wheel sizes work?  (Read 2348 times)

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Offline rollaboy

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how do wheel sizes work?
« on: Aug 7, 2005, 09:26PM »
pretty much what im wondering in my case is:

is a 17" 205/40 tyre the same size as a 16" 205/45 tyre?

how is the profile of a tyre measured?
milk and juice may come in 2 litres, but they dont have turbochargers bolted to the side of em

Offline Jtas

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Re: how do wheel sizes work?
« Reply #1 on: Aug 7, 2005, 09:46PM »
The profile is the sidewall height and is calculated as a percentage of the tyre width.

Sidewall height of a 17inch/205mm/40% tyre = 82mm
Sidewall height of a 16inch/205mm/45% tyre = 92.25

Offline rollaboy

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Re: how do wheel sizes work?
« Reply #2 on: Aug 7, 2005, 10:26PM »
not sure i understand,

what do u mean by sidewall??

ill give it a google and see what i get.

but since u know what ur talkig about, is a 40 profile on a 17" wheel gona be close in diameter to a 45 on 16" ??? bigger or smaller?
milk and juice may come in 2 litres, but they dont have turbochargers bolted to the side of em

Offline Jtas

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Re: how do wheel sizes work?
« Reply #3 on: Aug 7, 2005, 11:00PM »




http://www.needforspeed.co.uk/htmlpages/TechWheels.htm
(bottom of page)

is a 40 profile on a 17" wheel gona be close in diameter to a 45 on 16" ??? bigger or smaller?
Yes, it's the closest you'll get.  Your speedo will be out by about 1kmph

http://www.miata.net/garage/tirecalc.html

Offline noss

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Re: how do wheel sizes work?
« Reply #4 on: Aug 7, 2005, 11:24PM »
there is a post in the faq section about this complete with a tyre size calculator

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Offline rollaboy

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Re: how do wheel sizes work?
« Reply #5 on: Aug 8, 2005, 01:19AM »
ok then yeah, might as well delete it.

i did sum googleing and worked it out.

thanks for ur help taz, much appreciated.

milk and juice may come in 2 litres, but they dont have turbochargers bolted to the side of em

Offline KMA_TRX

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Re: how do wheel sizes work?
« Reply #6 on: Sep 5, 2005, 11:20PM »
should i bother checking with nrma b4 getting new rims

Offline Kranzy

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Re: how do wheel sizes work?
« Reply #7 on: Sep 6, 2005, 12:39AM »
Yes it would proabably be best to enquire with them so you dont get caught out by not being covered if you do have an accident.

Also try and keep the posts relivant to the section. Not many people would read your post here going of the heading which has been covered a lot therefore your better off starting a new topic with all your questions in there.
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Offline roseremirez

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Re: how do wheel sizes work?
« Reply #8 on: Mar 25, 2014, 12:29AM »
i think there is no need of any confusions because
Sidewall height of a 17inch/205mm/40% tyre = 82mm
Sidewall height of a 16inch/205mm/45% tyre = 92.25
if you are still confuse visit to R & R Certified Tire and Auto

Offline deviate

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Re: how do wheel sizes work?
« Reply #9 on: Mar 25, 2014, 01:27PM »
This should help you keep your rolling diameter as close to the same as possible

Offline deviate

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