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345/35 18 rear Hoosier A7 C7 Grandsport

 
Old 05-14-2019, 09:47 AM
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Nabush
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Default 345/35 18 rear Hoosier A7 C7 Grandsport

Guys,

Will this fit on the rear of a 2017 GS. Wheel is an MRR 755 12.0 ET55...
I think it would, but concerned about the taller tire rubbing the wheel guards...

This would be for AutoX, on hoosiers A7

Thanks
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Old 05-14-2019, 10:41 AM
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Originally Posted by Nabush View Post
Guys,

Will this fit on the rear of a 2017 GS. Wheel is an MRR 755 12.0 ET55...
I think it would, but concerned about the taller tire rubbing the wheel guards...

This would be for AutoX, on hoosiers A7

Thanks
I'd prefer to have a good wheel on a car as heavy as a C7 when you're running a Hoosier, but the fitment should be fine. I have no clue what the off set and fitment of those wheels is, but physically a 345 Hoosier will fit on the back of a Grand Sport. A 12.5 or 13" wheel would be better, but a 12" will work.

If the car is lowered much it will knock the rear fender liners out, but stock or close to stock height should be fine.

Last edited by RichieRichZ06; 05-14-2019 at 10:42 AM.
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Old 05-14-2019, 11:58 AM
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Nabush
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Hi,

My concern is more the taller tire than the width. Tire will be 20mm taller (0.75 inch)than my stock 335/25 20 Cup2...I'm slighly lowered on stock bolts.

As far as the wheels these are flow formed which is way better than cast, and they are probably stronger than the stock ones which are bending very easily...I've run extensive roadcourse on cast wheels in France (Rota P45) and never had an issue...

Thanks
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Old 05-14-2019, 02:14 PM
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Originally Posted by Nabush View Post
Hi,

My concern is more the taller tire than the width. Tire will be 20mm taller (0.75 inch)than my stock 335/25 20 Cup2...I'm slighly lowered on stock bolts.

As far as the wheels these are flow formed which is way better than cast, and they are probably stronger than the stock ones which are bending very easily...I've run extensive roadcourse on cast wheels in France (Rota P45) and never had an issue...

Thanks
Google the tire diameters. You're wrong.
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Old 05-14-2019, 02:45 PM
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Nabush
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335/25 20 Stock diameter 676mm
345/35 18 New diameter 697mm

Where am I wrong ?
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Old 05-14-2019, 02:56 PM
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Originally Posted by Nabush View Post
335/25 20 Stock diameter 676mm
345/35 18 New diameter 697mm

Where am I wrong ?
What tire are you quoting for your 345/35r18? 26.8" is all I can find. That's 681 mm.
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Old 05-14-2019, 04:41 PM
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RichieRichZ06
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Originally Posted by Nabush View Post
335/25 20 Stock diameter 676mm
345/35 18 New diameter 697mm

Where am I wrong ?
Stock Michelin tires should be 26.6" and the Hoosier 345/35/18 should be 26.8". It's not an issue on any car that we've ran them on.
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Old 05-14-2019, 05:11 PM
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You guys are right I messed up my calculation earlier...thanks
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