mathematics who will know

The question is if you change tyre size from 205 75 R16 to I believe 205 85 R 16 is next size up or what is available in higher profile to suit rims and in question landcruiser gearing what will be the change in gearing and revs in 5th gear and hopefully fuel economy. Also a comparison to changing diff ratios. Interested to here
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Reply By: Olsen's 4WD Tours and Training - Tuesday, Jun 22, 2010 at 21:44

Tuesday, Jun 22, 2010 at 21:44
Well first of all in QLD it would be illegal because you changed the tyre size by more than 15mm (20.5m). But I note you are in NSW :-)

Some simple mathematics or this site may help your questions

AnswerID: 421792

Follow Up By: Olsen's 4WD Tours and Training - Tuesday, Jun 22, 2010 at 21:44

Tuesday, Jun 22, 2010 at 21:44
20.5 mm doh
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FollowupID: 692195

Follow Up By: mikehzz - Tuesday, Jun 22, 2010 at 21:52

Tuesday, Jun 22, 2010 at 21:52
I was at a tyre shop today and I think he said the same....up to 15 mm is legal. I am in NSW.
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FollowupID: 692196

Reply By: chris_s - Tuesday, Jun 22, 2010 at 21:44

Tuesday, Jun 22, 2010 at 21:44
Have a look at this site:http://www.wheelsmaster.com/rt_specs.jsp
It does a direct comparison of tyre size and offset requirements
Cheers
chris
AnswerID: 421793

Follow Up By: chris_s - Tuesday, Jun 22, 2010 at 22:01

Tuesday, Jun 22, 2010 at 22:01
Have a look here for the new NCOP regulations:
http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/vsb_ncop.aspx
4wds now can have a 50mm increase in tyre diametre up from the original size. This is now legalised in Vic, not sure of the other states.
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FollowupID: 692199

Reply By: Ianw - Tuesday, Jun 22, 2010 at 23:04

Tuesday, Jun 22, 2010 at 23:04
5.74% difference.

http://www.carbibles.com/tyre_bible_pg4.html

2\3rds the way down the page is a calculator.

Ian
AnswerID: 421803

Reply By: trainslux - Wednesday, Jun 23, 2010 at 09:54

Wednesday, Jun 23, 2010 at 09:54
another calculator for you.

http://www.1010tires.com/TireSizeCalculator.asp?action=submit

Trains
AnswerID: 421840

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