Is it bad to go from 245/45 to 245/40 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

paultheman2007 · 01-20-2012, 11:18 PM

I'm not smart about tires but certain tires do my 245/45 then some do 245/40 does it effect the car

tribone · 01-20-2012, 11:45 PM

Quote:

Originally Posted by paultheman2007

I'm not smart about tires but certain tires do my 245/45 then some do 245/40 does it effect the car

What are you trying to do? Are you just getting a tire replacement?

FEN · 01-21-2012, 12:49 AM

The 245/40 are almost an inch smaller in diameter.

paultheman2007 · 01-21-2012, 07:41 AM

Yea I am getting tire replacement and I was wondering why if you change 45 to 40 the choose of tire is so wider and has anyone got 245/40 falken tires ?

Sir Nuke · 01-21-2012, 10:06 AM

Quote:

Originally Posted by paultheman2007

Yea I am getting tire replacement and I was wondering why if you change 45 to 40 the choose of tire is so wider and has anyone got 245/40 falken tires ?

YES it would affect your car......actually if you go fron 245/45 to 245/40 when your speedo reads 60 mph.....you actually running 58 mph which will affect your odometer as well. AND your MPG.

SUX2BU · 01-21-2012, 12:08 PM

Quote:

Originally Posted by Sir Nuke

YES it would affect your car......actually if you go fron 245/45 to 245/40 when your speedo reads 60 mph.....you actually running 58 mph which will affect your odometer as well. AND your MPG.

Actually....
275/40 is the stock sized rear tires, so I assume he is just talking about replacing the fronts. The rear tires are the only ones that affect the speedometer and odometer. Going with 245/40 front tires will affect your MPG a tiny bit. It will actually INCREASE you MPG because the smaller tire will obviously be lighter and a lighter rotational mass takes less power to turn.
Also some people will say that it will affect your stabilitrac or ABS, it won't. The BCM has to see a variance of 6% at speeds greater than 62 mph to set off any codes. With 245/40 20 fronts and 275/40 20 rears you will only be at a 3.4% difference.

I have a TON of experience over the years with different tire sizes. Hell, I've had EIGHT different size tires on Ginger!

paultheman2007 · 01-21-2012, 01:00 PM

thank you guys for all the help that's why i always come here wit my stupid questions :<)

SUX2BU · 01-21-2012, 01:10 PM

Quote:

Originally Posted by paultheman2007

thank you guys for all the help that's why i always come here wit my stupid questions :<)

Feel free to ask as many questions as you want, I always say "No such thing as stupid questions just stupid answers."

Group-A Wheels · 01-21-2012, 01:11 PM

The 245-40 is 1" shorter then the 245-45. Unless you are planning on lowering your car severly there is no advantage in the shorter fronts. Especially, since you havent mentioned your plans for the rear.
Plus, you will end up with alot more fender gap on the car then what you have now. Which is silly.
All things being equal, you are better off keeping the same front size as factory.

butters · 01-22-2012, 12:45 AM

Sir Nuke · 01-22-2012, 02:13 PM

Quote:

Originally Posted by Group-A Wheels

The 245-40 is 1" shorter then the 245-45. Unless you are planning on lowering your car severly there is no advantage in the shorter fronts. Especially, since you havent mentioned your plans for the rear.
Plus, you will end up with alot more fender gap on the car then what you have now. Which is silly.
All things being equal, you are better off keeping the same front size as factory.

what he said!!

datagram940 · 05-02-2016, 12:23 AM

I have Havoc wheels (8x20 and 9x20) with KW V3 coilover.

I' d like to put:

245 40 20 on the front and 275 40 R20 (stock size) on the rear

Or

245 35 20 on the front and 275 35 R20 on the rear

Will I have affect my stabilitrac or abs?

Thank you!!!!!!

13BRM2SSRS · 05-02-2016, 10:07 AM

Quote:

Originally Posted by datagram940

I have Havoc wheels (8x20 and 9x20) with KW V3 coilover.

I' d like to put:

245 40 20 on the front and 275 40 R20 (stock size) on the rear

Or

245 35 20 on the front and 275 35 R20 on the rear

Will I have affect my stabilitrac or abs?

Thank you!!!!!!

Yes, either of those sizes you will be about an 1" difference front to back and will have issues. See chart below for recommended sizes.

Recommended 20" tires for 2010 Camaro
245/45-20 = 28.7" tall, 8.0-8.5 wheel
255/45-20 = 29.0" tall, 8.0-8.5 wheel
265/40-20 = 28.4" tall, 8.5-9.0 wheel
275/40-20 = 28.7" tall, 9.0-9.5 wheel
285/40-20 = 28.9" tall, 9.0-10.0 wheel
295/35-20 = 28.1" tall, 9.5-10.5 wheel
305/35-20 = 28.4" tall, 10.0-10.5 wheel
315/35-20 = 28.7" tall, 10.5-11.0 wheel

datagram940 · 05-02-2016, 11:19 PM

Quote:

Originally Posted by 13BRM2SSRS

Yes, either of those sizes you will be about an 1" difference front to back and will have issues. See chart below for recommended sizes.

Recommended 20" tires for 2010 Camaro
245/45-20 = 28.7" tall, 8.0-8.5 wheel
255/45-20 = 29.0" tall, 8.0-8.5 wheel
265/40-20 = 28.4" tall, 8.5-9.0 wheel
275/40-20 = 28.7" tall, 9.0-9.5 wheel
285/40-20 = 28.9" tall, 9.0-10.0 wheel
295/35-20 = 28.1" tall, 9.5-10.5 wheel
305/35-20 = 28.4" tall, 10.0-10.5 wheel
315/35-20 = 28.7" tall, 10.5-11.0 wheel

Thank you!!!!

01-20-2012, 11:18 PM	#1
paultheman2007 SWFLGENS Drives: 2011 Camaro 1SS Join Date: Sep 2010 Location: Fort myers Fl Posts: 968 View My Garage	Is it bad to go from 245/45 to 245/40 I'm not smart about tires but certain tires do my 245/45 then some do 245/40 does it effect the car __________________ SWFLGENS on facebook.

01-21-2012, 12:49 AM	#3
FEN Drives: BLACK 2SS/RS Join Date: Sep 2009 Location: Florida Posts: 1,092	The 245/40 are almost an inch smaller in diameter. __________________ CCW polished 505a's Front 20x10 w/275/40/20's Rear 20x11.5 w/305/35/20's Eibach 1" Pro Spring Kit Factory GFX MPD1 spoiler painted bowties 15% tint

01-21-2012, 07:41 AM	#4
paultheman2007 SWFLGENS Drives: 2011 Camaro 1SS Join Date: Sep 2010 Location: Fort myers Fl Posts: 968 View My Garage	Yea I am getting tire replacement and I was wondering why if you change 45 to 40 the choose of tire is so wider and has anyone got 245/40 falken tires ? __________________ SWFLGENS on facebook.

01-21-2012, 01:00 PM	#7
paultheman2007 SWFLGENS Drives: 2011 Camaro 1SS Join Date: Sep 2010 Location: Fort myers Fl Posts: 968 View My Garage	thank you guys for all the help that's why i always come here wit my stupid questions :<) __________________ SWFLGENS on facebook.

05-02-2016, 12:23 AM	#12
datagram940 Drives: Camaro 2SS RS Join Date: Oct 2014 Location: :-) Posts: 61	I have Havoc wheels (8x20 and 9x20) with KW V3 coilover. I' d like to put: 245 40 20 on the front and 275 40 R20 (stock size) on the rear Or 245 35 20 on the front and 275 35 R20 on the rear Will I have affect my stabilitrac or abs? Thank you!!!!!! __________________

01-21-2012, 01:11 PM	#9
Group-A Wheels Account Suspended Drives: Camaro SS Join Date: Mar 2011 Location: New York Posts: 532	The 245-40 is 1" shorter then the 245-45. Unless you are planning on lowering your car severly there is no advantage in the shorter fronts. Especially, since you havent mentioned your plans for the rear. Plus, you will end up with alot more fender gap on the car then what you have now. Which is silly. All things being equal, you are better off keeping the same front size as factory.

01-22-2012, 12:45 AM	#10
butters Drives: 2010 2SS/RS L99 Join Date: Jul 2011 Location: Chicago, IL Posts: 1,139 View My Garage

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