Need help with plus sizing, etc on SS rims

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12-12-2004, 03:50 AM

stone4779

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Location: Mission, TX

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Need help with plus sizing, etc on SS rims

I have the car in the sig with the stock rims(16x9) and 4.10 gears eith 255/50/16s. My speedo is programmed for this. The rims I bought are 2002 SS rims (17x9 i believe) and Im putting 275/40s on'em....

How much is this going to throw off my speedo?

thanks

-Chris

12-12-2004, 07:53 AM

02zl1_97ss

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Location: Central Iowa, Des Moines area

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Re: Need help with plus sizing, etc on SS rims

IF your car originally came out with P245/50R16 tires and you HAVE NOT reprogrammed, going to the P275/40R17 tires will not change anything as both tires have the exact same rolling diameter.

12-12-2004, 09:11 AM

Injuneer

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Re: Need help with plus sizing, etc on SS rims

But, since he has already told us he is programmed for the 255/50's, his speedo will theoretically be reading approx 1.47% higher than actual road speed, or about a 1mph error at 70mph.

By the way, the stock wheels are 16x8.

12-12-2004, 02:00 PM

stone4779

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Join Date: Mar 2004

Location: Mission, TX

Posts: 567

Re: Need help with plus sizing, etc on SS rims

Quote:

Originally Posted by Injuneer

Good info!

Thanks guys! 1 mph wont even matter so thats cool.

Cant wait to see those Eagle F1 GSD3's on them

And on my car for that matter lol. They look so cool I might have a hard time making myself drive on them.

Thanks a lot guys, CZ28.com has saved me a ton of time/money, just glad you guys are here

Heck I'd pay for a membership here lol.