Question on offset - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

FRStrent · 02-17-2015, 01:21 PM

So my car is an hour away in storage and don't have time to go look at it. The wheels I want to get are a +20 offset. The stock offset on the stock wheels is +48. So, 48 - 20 = 28. 28mm difference. 28mm = 1.1 inches. So the wheel will be sticking out 1.1 inches more than stock. My question is, will the wheel be sticking outside the body of the car? because I'm not sure how I feel about that. If I could get to my car I would just measure it but I can't.

Thank you.

FRStrent · 02-17-2015, 02:02 PM

nvm changed my mind lol

mav1178 · 02-17-2015, 02:12 PM

Offset needs to be considered in context of wheel width.

A number you should memorize is 41. That is the number of mm the face of the wheel is from the backpad, aka how much off the brake rotor surface your stock wheels sit.

To figure out how much a wheel will stick out, you'd need to know only wheel width and wheel offset. So a +20 on a, say, 8.5" wheel will be (8.5/2*25.4) - 20 = 87.95mm out from rotor surface, which means it will be 87.95-41 = 46.95mm (1.85") farther out than your stock wheels.

-alex

FRStrent · 02-18-2015, 09:21 AM

Thank you for that information. Much appreciated.

02-17-2015, 01:21 PM	#1
FRStrent Member Join Date: Jul 2014 Drives: Scion FRS Location: USA Posts: 53 Thanks: 20 Thanked 19 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Question on offset So my car is an hour away in storage and don't have time to go look at it. The wheels I want to get are a +20 offset. The stock offset on the stock wheels is +48. So, 48 - 20 = 28. 28mm difference. 28mm = 1.1 inches. So the wheel will be sticking out 1.1 inches more than stock. My question is, will the wheel be sticking outside the body of the car? because I'm not sure how I feel about that. If I could get to my car I would just measure it but I can't. Thank you.

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02-17-2015, 02:02 PM	#2
FRStrent Member Join Date: Jul 2014 Drives: Scion FRS Location: USA Posts: 53 Thanks: 20 Thanked 19 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	nvm changed my mind lol

02-17-2015, 02:12 PM	#3
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,097 Times in 3,029 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	Offset needs to be considered in context of wheel width. A number you should memorize is 41. That is the number of mm the face of the wheel is from the backpad, aka how much off the brake rotor surface your stock wheels sit. To figure out how much a wheel will stick out, you'd need to know only wheel width and wheel offset. So a +20 on a, say, 8.5" wheel will be (8.5/2*25.4) - 20 = 87.95mm out from rotor surface, which means it will be 87.95-41 = 46.95mm (1.85") farther out than your stock wheels. -alex

02-18-2015, 09:21 AM	#4
FRStrent Member Join Date: Jul 2014 Drives: Scion FRS Location: USA Posts: 53 Thanks: 20 Thanked 19 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you for that information. Much appreciated.

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