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Vehicle & Technical => Discovery => Topic started by: CanIBeFrank on April 08, 2007, 21:35:18

Title: Wheel size explained
Post by: CanIBeFrank on April 08, 2007, 21:35:18

Hi,

Bet everyone knows the answer to this  :?

The size on wheels eg 8x16 Black Modular, the 8 is offset?

What does that actually mean? distance from the hub?

I have 300Tdi Disco 95 5 door (will fit a 2" lift shortly), what would fitting 8x16 gain over 7x16? I aim to fit 235/85 Machos.

Thanks.

Title: Wheel size explained
Post by: andyb on April 08, 2007, 21:38:32

The 8 is the width/depth of the rim in inches.

What do you gain? Ability to fit wider tyres :)

HTH

Title: Wheel size explained
Post by: CanIBeFrank on April 08, 2007, 21:40:31

Thanks andyb, that was a quick reply, are you stalking this forum ;).

So on a 235/85 I would be fine on a 7x16?

Title: Wheel size explained
Post by: Disco-Ron on April 08, 2007, 21:49:58

235 85's would be better on 7's, the 8mm offset means that the hub face, is 8mm nearer the outside rim than from the centre of the rim..... if that makes sense.... a wheel with the hub face directly in the centre has an offset of zero..... nearer the outer face is positive, nearer the inside is negative offset...

Hope that helps!!

Title: Wheel size explained
Post by: andyb on April 08, 2007, 22:05:28

Quote

So on a 235/85 I would be fine on a 7x16?

Yep. I'm running 255/65s on 7x16 rims.

Title: Wheel size explained
Post by: CanIBeFrank on April 08, 2007, 22:19:42

Thanks for your help Ron and Andy.

Title: Wheel size explained
Post by: Range Rover Blues on April 09, 2007, 13:49:59

Quote from: "Disco-Ron"

235 85's would be better on 7's, the 8mm offset means that the hub face, is 8mm nearer the outside rim than from the centre of the rim..... if that makes sense.... a wheel with the hub face directly in the centre has an offset of zero..... nearer the outer face is positive, nearer the inside is negative offset...

Hope that helps!!

eh :-s

The 8 is the width of the rim in inches, not the offset which is a measure of, well the offset of the tyre over the hub flange.

IF you are buying new wheels then there is an arguament for fitting wider rims, in that 235mm is way more than 7 inches and to get the best handling the rim should be as wide or wider than the tyre tread.

But on a 2 tonne truck, handling, really :?

Title: Wheel size explained
Post by: Disco-Ron on April 09, 2007, 20:44:11

RRB, i know what i meant, but i can see where it could be read wrongly, the '7' i refer to was rim width, where i mention '8', i'm refering to offset, not rim width..... hth....

Title: Wheel size explained
Post by: CanIBeFrank on April 09, 2007, 20:56:10

So,

235/85 R16 Machos on 8x16 modulars then? (sorry if I'm not picking this up to quickly)

Title: Wheel size explained
Post by: redhand on April 09, 2007, 21:02:40

yep got it in one. As 235mm = 9 1/2". Th wheel should never be wider than the tire! If it was it wouldn't maintain an airtight seal. Also the rim of a tyre is the narrowest part of the tire so a 235 tire is probably 200mm wide at the rim.

Title: Wheel size explained
Post by: Range Rover Blues on April 13, 2007, 21:10:21

Quote from: "redhand"

Th wheel should never be wider than the tire! If it was it wouldn't maintain an airtight seal.

Wrong, on a road car if you want the best handling the tyre should be narrower than the rim, and if you can get a 50 series to seal on a rim then there should be no problem with a 85 series tyre.