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Re:Finding Aftermarket Rims

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13 Sep 2021 18:01 - 13 Sep 2021 18:04 #238569 by fordem
Replied by fordem on topic Re:Finding Aftermarket Rims

Offset is not determined by width. Offset is determined the value of central section of rim in relation to the outside rim

Sent from my SM-A505F using Tapatalk

Maybe that was poorly worded - I'll restate it for you.

The offset YOU need will be determined by the width of the rim YOU choose.

As the width of the rim increases, the offset needs to be adjusted (in this case increased) to compensate or the outer edge of the rim will protrude beyond the fender
Last edit: 13 Sep 2021 18:04 by fordem. Reason: Clarity

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14 Sep 2021 11:53 #238596 by fordem
Replied by fordem on topic Finding Aftermarket Rims

The wider the tyre (205 x 215 v 225 etc) will determine how far out it will stick out and therefore determine the offset.

This is not incorrect, but it's also not quite correct.

The width of the tire is to some extent dependent on the width of the rim, and as I've said before the width of the rim chosen will determine the offset required to stay within the fender.

Every tire manufacturer has a spec chart that lists a range of rim widths for any given tire - for example a 225 tire can be used on a rim between 6.0~7.5 inches, a 215 can be used with 5.5~7.0 inch, and a 205 can be used on a 5.0~7.0 inch rim - these numbers by the way came from General Tire's web page, and are specific to the General Grabber A/TX.

My JB74 came with 15x5.5 rims with 195/80R15 tires, switching to a 215 on the OEM rims (the widest tire that rim can take) will have the inner edge of the tire sitting 10mm further inwards, at the same time as the outer edge will be 10mm further out - I estimate the OEM tire is almost an inch (25mm) inside the edge of the fender, so a 215 will still be covered.

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