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205/50-17 to 225/45-17

Rapewta
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Rapewta Member

Rapewta

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If I keep the same front stock turbo twists that are 17X7 with a 55 mm offset and 205/50/17's... can I put a 225/45-17's on the rim with no

interference?

The rears are 17X9 with a 55 mm offset with 255/40-17's. I am replacing them with 17X11 et 81mm offset and 295/35-17's.

This is a 99 narrow body C2.

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Rapewta Member

Rapewta

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Thanks for the info. I found the TSB on this site and basically I can achieve what I set out to do only

I have to calculate the tire profile for a 17" rim. Everything is in 18". Maybe I am just to "old school"

and like the 17" more than the larger rims.

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DanIelT Member

DanIelT

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ran 225x45x17s on my stock 7" turbo twists on the front of my '99 Boxster with absolutely no interference....and the car was running about 1.5 inches lower than stock.

so should work on a 996 with no problems. :thumbup:

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jacks996 Member

jacks996

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I just put on 7.5 x 17 rim on the front with 225 45s and all is well. The wheel is a ET47 offset which basically just re-centers the 7.5 rim. My C4 sits on PSS9 lowered to GT3 height. So I doubt you would have any issue in the front ... but I would be interested in hearing about the 11 x 17s on the rear.

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Rapewta Member

Rapewta

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Well, that is a relief. Thanks. I didn't think going from a 205 to a 225 keeping the same 7" rim is a big physical

change.

The 17X11's are my old 17X9's widened by a machine shop is SoCal. Not many places do OEM factory porsche rims, so I had to

send them off in the mail.

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Long Islander Member

Long Islander

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If I keep the same front stock turbo twists that are 17X7 with a 55 mm offset and 205/50/17's... can I put a 225/45-17's on the rim with no

interference?

The rears are 17X9 with a 55 mm offset with 255/40-17's. I am replacing them with 17X11 et 81mm offset and 295/35-17's.

This is a 99 narrow body C2.

I also have stock 17" rims, and I've been wondering the same thing. The 205's are just too skinny, and result in significant understeer.

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Rapewta Member

Rapewta

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The Rim Width range for the 225/45R-17 is 7.00 to 8.50 inches.

Tire Rack specifies this on the invoice I received after ordering the new tires.

The Rim Width range for the 295/35R-17 is 10.00 to 11.50 inches, also noted on the invoice.

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