Does Increasing Rim Size Affect Anything?
Thread Starter
Safety Car
Joined: Jul 2007
Posts: 4,333
Likes: 6
From: Louisville Kentucky
Does Increasing Rim Size Affect Anything?
I have a 2001 Coupe with the 17"/18" combination of wheels. If I change the rims to a bigger size, will this affect anything like my speedometer reading or screw with the computer in any way?
Melting Slicks
Joined: Aug 2006
Posts: 2,866
Likes: 45
From: Tampa Bay, Go BUCS!!!Go Rays!!!Go Lightning!!!
St. Jude Donor '12-'13-'14
Not if you make sure the new TIRES are the same diameter as stock.
Only thing then will be that the new wheels will be heavier. How much depends on the wheels. If you go with good quality wheels they probably won't be much heavier.
Only thing then will be that the new wheels will be heavier. How much depends on the wheels. If you go with good quality wheels they probably won't be much heavier.
Safety Car
Joined: May 2005
Posts: 4,524
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From: Burbs Illinois
St. Jude Donor '06
here we go again...
see this link.. http://forums.corvetteforum.com/show...post1561327679
in a word, yes.
see this link.. http://forums.corvetteforum.com/show...post1561327679
in a word, yes.
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Another factor is, unless you are looking purely for bling (and it seems like a Marine would prefer real handling before looks) the selection of good performance tires in useable sizes is very limited above an 18/19 in combo.
Thread Starter
Safety Car
Joined: Jul 2007
Posts: 4,333
Likes: 6
From: Louisville Kentucky
here we go again...
see this link.. http://forums.corvetteforum.com/show...post1561327679
in a word, yes.
see this link.. http://forums.corvetteforum.com/show...post1561327679
in a word, yes.
Thread Starter
Safety Car
Joined: Jul 2007
Posts: 4,333
Likes: 6
From: Louisville Kentucky
Your speedometer reading is based on the overall diameter of your rear tires, which should be 26.7 in. It does not matter if you go wider, like a 295/35R18 or 335/30R18, or bigger diameter rim like 305/30R19. As long as the diameter is close to 26.7 in, you should be OK. Also, don't let your rear tires get smaller than around 1/2 in more than the fronts, or you could have possible ABS/AH problems. That computer expects the rears to turn slower than the fronts, because they are larger diameter. If they don't, it can throw a code and can liimit you to 80mph. That computer can't be reprogrammed. The PCM computer can be reprogrammed for different tire sizes, if you get too far away from the 26.7 in stock setting, to keep your speedo accurate.
Another factor is, unless you are looking purely for bling (and it seems like a Marine would prefer real handling before looks) the selection of good performance tires in useable sizes is very limited above an 18/19 in combo.
Another factor is, unless you are looking purely for bling (and it seems like a Marine would prefer real handling before looks) the selection of good performance tires in useable sizes is very limited above an 18/19 in combo.
I just know how to blow'em up! And I've got that down to a science.
Safety Car
Joined: May 2005
Posts: 4,524
Likes: 0
From: Burbs Illinois
St. Jude Donor '06
Nice link Halfway, it has an amount of good information but it does not address my direct question in any way. I specifically want to know how this will affect my speedometer reading AND what adverse affects will it have on the onboard computer. I could care less about hooking up and road surface. I have a muscle car that I do that in and as far as looks are concerned, that's a individual thing. Thanks!
some good info in there, like you said, for anyone jumping up in wheel size though
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Race Director
Joined: Jan 2006
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From: Not on either liberal coast.
Go to this site, enter your oem tire sizes and new tire sizes. It'll provide all aspect ratios so you can compute % of change, if applicable. Scroll down and you'll see it computes a % change in your speedometer error, if applicable.
http://www.miata.net/garage/tirecalc.html
http://www.miata.net/garage/tirecalc.html
Thread Starter
Safety Car
Joined: Jul 2007
Posts: 4,333
Likes: 6
From: Louisville Kentucky
Go to this site, enter your oem tire sizes and new tire sizes. It'll provide all aspect ratios so you can compute % of change, if applicable. Scroll down and you'll see it computes a % change in your speedometer error, if applicable.
http://www.miata.net/garage/tirecalc.html
http://www.miata.net/garage/tirecalc.html
