tyre calculator

Submitted: Sunday, Jan 08, 2006 at 13:03
ThreadID: 29466 Views:4070 Replies:5 FollowUps:6
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to work out circumference differences

e.g 235/85/16 to 265/75/16

is there one on the site or can someone give me a link?

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Reply By: mattie - Sunday, Jan 08, 2006 at 13:19

Sunday, Jan 08, 2006 at 13:19
Hi Ozdyssey
Have not used this site but this may help
http://www.osella.com.au/gear-ratios.htm

Mattie
AnswerID: 147149

Reply By: 120scruiser - Sunday, Jan 08, 2006 at 13:22

Sunday, Jan 08, 2006 at 13:22
Try this site.
Just click on technical details.
www.bfgoodrich.com.au
The table that comes up has all different data about all tyre sizes.
Hope this helps
120scruiser
AnswerID: 147152

Reply By: Bonz (Vic) - Sunday, Jan 08, 2006 at 14:42

Sunday, Jan 08, 2006 at 14:42
This tyre size calculator is the best I have seen, and I have seen a few. Enjoy
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Follow Up By: Matt (W.A.) - Sunday, Jan 08, 2006 at 15:32

Sunday, Jan 08, 2006 at 15:32
Bonz,
The only Problem for me is that they don't go big enough... Ha Ha

Matt
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Follow Up By: Bonz (Vic) - Sunday, Jan 08, 2006 at 15:38

Sunday, Jan 08, 2006 at 15:38
what size tyre you doing? they have a section at the bottom for all sizes I thought
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Follow Up By: Matt (W.A.) - Monday, Jan 09, 2006 at 15:15

Monday, Jan 09, 2006 at 15:15
Bonz,
Thanks for that it always helps if I scroll down the whole page before I open my Gob...Ha Ha

Cheers

Matt
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Reply By: Member - Ozdyssey (QLD) - Sunday, Jan 08, 2006 at 16:01

Sunday, Jan 08, 2006 at 16:01
Cheers all
that's the one Bonz
AnswerID: 147196

Reply By: Snowy 3.0iTD - Monday, Jan 09, 2006 at 09:00

Monday, Jan 09, 2006 at 09:00
Ozdyssey

Circumfrence = PI (3.14 approx) x Wheel Diameter

Wheel Diameter(mm) = (Tyre Width(mm) x Aspect ratio x 0.01 x 2) + (Rim diameter (in) x 26.4)

So for example a 235/85/16 tyre:

Wheel Diameter = (235 x 85 x 0.01 x 2) + (16 x 26.4)
= 399.5 + 422.4
= 821.9mm

Circumfrence = 3.14 x 821.9 = 2581mm = 2.581m

A second example 265/75/16

Wheel Diameter = (265 x 75 x 0.01 x 2) + (16 x 26.4)
= 397.5 + 422.4
= 819.8mm

Cicrumfrence = 3.14 x 819.8 = 2574mm = 2.574m

You could try putting all of this in to a MS-Excel spread sheet or if you email me at snowdenj@onesteel it would take me five minutes to throw one together and send it out to you.

Kind Regards
AnswerID: 147333

Follow Up By: Snowy 3.0iTD - Monday, Jan 09, 2006 at 09:16

Monday, Jan 09, 2006 at 09:16
Forgot to add that is @onesteel.com no au
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Follow Up By: Member - Bill F (VIC) - Monday, Jan 09, 2006 at 15:53

Monday, Jan 09, 2006 at 15:53
Hi Snowy

Please convert troopy skinny tyres 750/75.R16LT
Thanks
BillF
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Follow Up By: Snowy 3.0iTD - Wednesday, Jan 11, 2006 at 13:43

Wednesday, Jan 11, 2006 at 13:43
Bill I am not overly familiar with skinny tyres but I will assume you mean 7.5 inches wide not 750mm, ie 7.50/75 R16 LT

Tyre width 7.5 inches
Aspect Ratio 75
Rim Size 16 inch

7.5 inches x 26.4mm/inch = 198 mm tyre width

198mm x 75% = 148.5mm tyre wall height

16 inches x 26.4mm/inch = 422.4mm

148.5mm x 2 + 422.4 = 719.4mm total wheel diameter.

3.14 (PI) x 719.4 = 2260mm = 2.26m total tyre circumfrence.

Hope this helps.
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