offset comparison calculation - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

24Dee · 05-19-2006, 09:09 AM

I remember reading it and could have swore that I saved the thread and even wrote it down but I can't find anything...

I want to compare a couple wheel sizes and offsets(17x8.5 +25, 17x9.5 +30, a few others) to see how I could get the same or very similar look out of 17x9 wheels... anyone remeber the calculation for doing that? something like for every 1/2 in width you add/subtract a certain amount of mm from the offset being used as a comparison.....

sorry if this sounds confusing, hopefully someone will remember or know what the hell i'm talking about....

Bushido · 05-19-2006, 10:50 AM

http://www.1010tires.com/WheelOffsetCalculator.asp

24Dee · 05-19-2006, 11:21 AM

wasn't exactly what I was looking for but that made it much easier... thank you...

KA24DESOneThree · 05-20-2006, 05:24 PM

One inch is 25.4mm. Divide it by two (for inner and outer half) and you get 12.7mm. For every inch wider, subtract 12.7mm from the effective offset. For example: 17x8 +30 --> 17x9 +30 would be the equivalent of 17x8 +17.

Thus, 17x9.5 +30 would be roughly equivalent to 17x8.5 +17.

This all depends on wheel design.

05-19-2006, 09:09 AM	#1
24Dee Zilvia Member Join Date: Oct 2003 Location: North Jersey Posts: 160 Trader Rating: (0)	offset comparison calculation I remember reading it and could have swore that I saved the thread and even wrote it down but I can't find anything... I want to compare a couple wheel sizes and offsets(17x8.5 +25, 17x9.5 +30, a few others) to see how I could get the same or very similar look out of 17x9 wheels... anyone remeber the calculation for doing that? something like for every 1/2 in width you add/subtract a certain amount of mm from the offset being used as a comparison..... sorry if this sounds confusing, hopefully someone will remember or know what the hell i'm talking about....

05-20-2006, 05:24 PM	#4
KA24DESOneThree Nissanaholic! Join Date: Feb 2004 Location: N. SD County SoCal Age: 23 Posts: 2,038 Trader Rating: (0) Rides Gallery: KA24DESOneThree	One inch is 25.4mm. Divide it by two (for inner and outer half) and you get 12.7mm. For every inch wider, subtract 12.7mm from the effective offset. For example: 17x8 +30 --> 17x9 +30 would be the equivalent of 17x8 +17. Thus, 17x9.5 +30 would be roughly equivalent to 17x8.5 +17. This all depends on wheel design. __________________ Your copycat car reflects your copycat life. Banned- Calguns.net 1/4/09

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05-19-2006, 10:50 AM	#2
Bushido Zilvia FREAK! Join Date: Jun 2003 Location: Gainesville/Fort Lauderdale Posts: 1,265 Trader Rating: (0)	http://www.1010tires.com/WheelOffsetCalculator.asp

05-19-2006, 11:21 AM	#3
24Dee Zilvia Member Join Date: Oct 2003 Location: North Jersey Posts: 160 Trader Rating: (0)	wasn't exactly what I was looking for but that made it much easier... thank you...