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i am trying to figure out whether or not i have to get my ecu reflashed to accept a bigger wheels size cause the mechanics that i talked to at the honda dealership i work at said that any wheel 1" bigger or smaller wil confuse the ecu so much that it will screw up the tranny so bad that i will need to get a new tranny. now if anybody out there knows anything about this please help. oh by the way i am getting eiher konig glide 17" flat black or konig driver 17" black.

 
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http://www.7thgencivic.com/modules.p...tor&file=index

The Great Tire Calculator imp:

 
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Their BSing you. the only thing you'll notice going to your 17s is a decrease in acceleration. and as long as you put the right tire size on, you wont have any problems with your speedo or odometer.

 
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I have 205/40/17 and my speedo is too fast. I'm planning on getting 215/45/17 which will put my speedo closer to original.

 
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i dont want to start an argument with zzyzx, but case in point a friend of mine had to get his tranny replaced with a brand new one because of his aftermarket wheels. this is straight from a honda mechanic with 20 years experience.

 
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No worries man, I just say that its not right. The only thing that would even remotely put any extra stress on the transmission would be if the new wheels were substantiually heavier then the original. and think, the factory puts 3 different size wheels on our cars with out changing any thing but the gearing (No reinforcing)...... 14s, 15s and the FP model has 16s..... and the FP option doesnt change the gearing at all (Baised on what model you buy it for) so Yes I say they are BSing you.

 
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hm, this might be a little off topic, but would getting 17" rims, that are lighter than the factory rims, still put a decrease in acceleration?

 
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you run in to 2 things, one is determined by the size of the tire( if its too tall you will accelerate slower). the other thing deals with Physics... basically because the majority of the mass on a wheel is at the rim (approx 80%) the farther that weight is from the center of the wheel, the more Torque it would take to get it to spin, so for a 17 to out perform a 15, that 17 would have to be substantually lighter then the 15.

 
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hm ... let's take a 17" rim that weighs 12.8 pounds ... tire size is 215/45/17 ... would you think the performance would be similar? ... how about vs. a stock EX alloy/stock tires ?

 
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I recall Boilermaker doing the math on his 2 wheels at the time, heres the info he posted

 
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Sounds like BS to me. Alot of dealers put on different sized wheels and tires for customers and still keep the factory warranty intact. The only time I've ever heard of the tranny potentially developing problems is when you run two different tires in the front of a front wheel drive car. For instance running the spare donut up front and then going over the specified speed rating. Supposely if you go over the 55 speed limit rating for an extended period with the donut on you can mess up the tranny differential I think.