300m Special - 235/55 18's
305

Asked by 02SPEC1AL Oct 11, 2010 at 09:50 PM about the 2002 Chrysler 300M Special FWD

Question type: Car Customization

My car came with 245/45 18's (Michelin Pilot Sports) and I recently replaced them with 235/55 18's (Pilot Sport A/S). My spedometer is now off because of the larger diameter tires. I really like the smoother ride but got a ticket for 40mph when it said I was doing 35mph. Guessing, when it says 70, I'm really doing 80. Is there a way to calibrate the speedometer to a larger tire size?

2 Answers
5,305

Jon answered 13 years ago

The tire size change you performed should not adversely effect your speedometer performance. But for some ungodly reason that it actually made a difference, the dealership might be able to program the new tire size into the module. Some years to not have the functionality to allow tire variance programming.

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305

02SPEC1AL answered 13 years ago

Thanks for the response. The new tire are actually 235/50 18's not 235/55 and they are the tallest tire I could get to fit inside the strut plate without rubbing or making other mods. I definitely notice less jump out of the hole but enjoy the smoother ride. Has anyone else gone to taller tires? I will ask the dealer if an adjustment could be made to compensate.

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