Changing from 275/75 to 285/75 ? Speedo gear

Submitted: Saturday, Feb 26, 2005 at 15:21
ThreadID: 20799 Views:1868 Replies:2 FollowUps:6
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I am changing tyres from 275 BFG to 285 BFG and need to know where in Sydney to get the replacement cog for the speedo cable to correct the speedo and odometer readings. Can anybody help please. I have been told there is a supplier over near Brookvale.

Thanks,

Jim
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Reply By: Pezza - Saturday, Feb 26, 2005 at 19:38

Saturday, Feb 26, 2005 at 19:38
Hi Jim,

Just did some calculations and your rolling diameter is going to be bigger by only 1/2", or 12.5mm, the difference between a new cooper and a worn out one.
Your speed difference is going to be 1.5kph. There is often a bigger difference than this between tyre brands and tread types of the same size.
Hope this helps you decide whether it is worth it or not.

Avagoodn
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Follow Up By: Member - Phil G (SA) - Saturday, Feb 26, 2005 at 21:27

Saturday, Feb 26, 2005 at 21:27
I think Jim got his sizes slightly wrong - I'd guess he's going from 275/70 to 285/75, which is about 4-5% increase.

Cheers
Phil
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Follow Up By: Shaker - Saturday, Feb 26, 2005 at 22:27

Saturday, Feb 26, 2005 at 22:27
If he is changing from 75 to 85 profile it is around 8.3%, but if as posted it is just 275 to 285 with the same profile then it is around 1.5%
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Follow Up By: Member - Phil G (SA) - Saturday, Feb 26, 2005 at 22:38

Saturday, Feb 26, 2005 at 22:38
Shaker. The profiles were in the heading. They don't make 275/75. 275's come in a 70profile, while 285s come in a 75profile.

Cheers
Phil
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Follow Up By: Bonz (Vic) - Saturday, Feb 26, 2005 at 22:42

Saturday, Feb 26, 2005 at 22:42
was thinking maybe its 265/75 to 285/75 both 16's I take it
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Follow Up By: Member - Sparkie (QLD) - Sunday, Feb 27, 2005 at 08:04

Sunday, Feb 27, 2005 at 08:04
Love the rig pic, Bonz

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Follow Up By: GO_OFFROAD - Sunday, Feb 27, 2005 at 20:01

Sunday, Feb 27, 2005 at 20:01
What type of vehicle?

marks 4wd adaptors have a unit which will do what you require, but using your gps as a speedo is the most accurate way.
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Reply By: Member - DOZER- Monday, Feb 28, 2005 at 06:47

Monday, Feb 28, 2005 at 06:47
Jaycar'sell'a'kit'to'adjust'electro'speedos'aswell
drew
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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