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Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHChanging to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Check clearances

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Suggestion
They might also fit without spacers, but you would have to mount tires and check clearances.
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Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Replace lug bolts

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Suggestion
You will also need to change your lug bolts to longer ones to account for the spacers.
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Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Suggestion
Sent from my SM-G970U1 using Tapatalk
Original post Read captured discussion
Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Check clearances

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Suggestion
They might also fit without spacers, but you would have to mount tires and check clearances.
Original post Read captured discussion
Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace lug bolts

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Suggestion
You will also need to change your lug bolts to longer ones to account for the spacers.
Original post Read captured discussion
Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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No successful repair reported for this finding.

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Discussions that contain suggestions: 1

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Suggestion
Sent from my SM-G970U1 using Tapatalk
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Changing to 18" from 17" rims, issues? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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POST 1 / ORIGINAL POSTEROriginal post

Hi all, I have a 986 -00 base with 17" rims today. Yesterday I bought 18" 997 rims which I guess (hope) will fit my car. But, how will I for sure know that they´ll fit my car, is there somekind of table or calculator that can tell me this? Do I maybe need spacers or do some other mods? The new rims are - Front: 8Jx18H2 ET 57 and Back: 10Jx18H2-ET58 Is this enough information or do I need more? I mean, just because they fit in the wheelhouse standing still, what happens when I start to drive on a bumpy road, in corners etc? How shall I think? Thankful for all input on this, BIG thanks in advance!

POST 2Original post

Check out willtheyfit.com. They have a great tool to show you differences between setups. If they're closer than your stock setup, you may need spacers. Sent from my SM-G970U1 using Tapatalk

POST 3Original post

This table from the Boxster Owner's Manual (not sure what year) may help in picking a spacer size. Since 10 inch rears for a Boxster have a 47mm offset and your 997 rear wheels have a 58mm offset, a 10 or 11mm spacer may work on the rear. And on the front, the 8 inch Boxster wheel has a 50mm offset and the 997 wheels have a 57mm offset, so maybe a 7mm spacer. You will also need to change your lug bolts to longer ones to account for the spacers. They might also fit without spacers, but you would have to mount tires and check clearances. The handbrake cables may also need to be ziptied away from the tires.

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