Tires with larger Aspect Ratio

[bscn8c]

Hey guys,

I have a question I was hoping y'all can help me with. I have a GT with Performance Package, and I'm wondering what the effects would be if I used a tire with a larger aspect ratio (255/45 and 275/45 instead of 255/40 and 275/40).

The reason I ask is I was checking prices for winter tires, and the larger tires are half the price. I have stock PP suspension, so I assume they will fit with no problems.

I assume difference in the spedometer reading will be negligible? Will it have any side effects on the TPMS sensors (like constant warnings for tire pressure being too high)? Anything else I need to be aware of?

I'm sorry if this sounds like a newby question, but I don't know much about tires (and I couldn't find much searching the forums).

Thanks everyone.

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[plc268]

Only real side effect of a bigger tire diameter is that you'll be travelling faster than what your speedometer indicates. Not a huge deal if you know about it and can account for it.

Use this site and plug in your tire sizes to figure out your indicated and actual speeds.
http://tire-size-conversion.com/speedometer-calibration/

Going from 275/40/19 to 275/45/19, you'll be travelling 67.5 mph when your speedo says 65.