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New tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHNew tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Replace tires

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Suggestion

If I was the OP I would go back to the shop and have them change the tires to 225/45r17, those tires are to high compared to rears, and like you said the PSM light might come on with those tires.

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New tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace tires' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace tires' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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Suggestion

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New tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Replace tires

No successful repair reported for this finding.

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Suggestion

If I was the OP I would go back to the shop and have them change the tires to 225/45r17, those tires are to high compared to rears, and like you said the PSM light might come on with those tires.

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New tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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New tires- question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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POST 1 / ORIGINAL POSTEROriginal post

Just had my shop put on new tires. They are a performance shop and along with repairing and maintaining Porsches and other fine cars they build race cars. I had 205/50/17 & 255/40/17 on the car before and they put 225/50/17 and 255/40/17 on this time. I had been researching alternate fitments and saw that 225/45/17 was a popular alternative for the front. Are 225/50/17 ok on the front or will this cause any issues? Thanks for any help and please excuse if it’s a dumb question.

POST 2Original post

I don’t think 225/50 is proper for front, it raises the front end and you rather want slant the other way.

POST 3Original post

Short answer, no they will not cause any issues, but, they are almost an inch taller than the rears. If it was me I would get them to change them to 225/45r17, good luck.

POST 4Original post

That is not an acceptable swap. You're significantly altering the stance and balance of the car by going 225/50 up front. For a "performance shop" that's a pretty bonehead move. If you're just gentle street driving it may be fine, but I think you're gonna lose any understeer correction you would otherwise gain by going to the 225 and it could really be unsafe at high speeds where the underside of the car is now forming a wedge that will force the rear up. Sent from my SM-G970U1 using Tapatalk

POST 5Original post

Quotes source post: 642262

I believe that the difference on the tire diameter will also affect the PSM (or ABS?) system.. .

POST 6Original post

Yes you're right. On rwd car you can have up to 3% diference of rolling diameter without causing any problems, I think he's just around the 3% with that tire set up. On a awd it's only 1%. If I was the OP I would go back to the shop and have them change the tires to 225/45r17, those tires are to high compared to rears, and like you said the PSM light might come on with those tires.

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