CEAZERKHAN Posted February 24, 2022 Report Share Posted February 24, 2022 Just gonna get to the point, will 13x7 wheels fit front to back on a 1978 b210gx? i cannot find a straight answer, nor anything truely helpful. Not trying to swap to 280zx front struts or bang up the body, fine with a bit of fender rolling, but just wanting to buy wheels and get em on. hope this makes sense. these are the wheels im looking at, simple gloss black steelie look. Quote Link to comment
datzenmike Posted February 24, 2022 Report Share Posted February 24, 2022 Backspacing or off set, is also an important measurement. 13 X 7 is not the complete story. /production/contentful_rt_wheel-offset-vs-wheel-backspacing/r/390x293/s/85/2f35391508f6995aa17e5d8b5878bc08adfb0919.jpg Take a rim, turn it face down, put something flat across the rim edge and measure down to the hub mounting surface. For example a zero off set rim will measure 1/2 of the rim width. Your new rims should match the off set you now have so the wider rim will have room. The new rims may not match and stick out and rub the fenders, too far in and rub on tight turns. 1 Quote Link to comment
CEAZERKHAN Posted February 24, 2022 Author Report Share Posted February 24, 2022 (edited) 2 hours ago, datzenmike said: Backspacing or off set, is also an important measurement. 13 X 7 is not the complete story. /production/contentful_rt_wheel-offset-vs-wheel-backspacing/r/390x293/s/85/2f35391508f6995aa17e5d8b5878bc08adfb0919.jpg Take a rim, turn it face down, put something flat across the rim edge and measure down to the hub mounting surface. For example a zero off set rim will measure 1/2 of the rim width. Your new rims should match the off set you now have so the wider rim will have room. The new rims may not match and stick out and rub the fenders, too far in and rub on tight turns. hours later i now somewhat understand a bit more. from what i read 15x7 with 3in. backspacing and -25mm offset will fit the rear nicely. Then for the front 15x7 with 4in. backspacing and 0mm offset will fit perfect. Not surprised if i am wrong it is almost 1am at the time of writing this. Im hoping someone might be able to confirm if anything i said there even makes sense and if it will even fit. more info i plan on running 175/60 to 175/70. not sure yet maybe something in between. (same front to back) Edited February 24, 2022 by CEAZERKHAN Grammatical errors Quote Link to comment
datzenmike Posted February 24, 2022 Report Share Posted February 24, 2022 Try again using this handy calculator... http://www.gtsparkplugs.com/Offset-to-Backspace.html Can't check your work without knowing what you have on there now. It's assumed that your tire and rim is positioned in the middle of the fender well with equal room on either side? Room for a wider rim to expand into? Will a wider front rim clear the strut tube? or will you perhaps need to add some negative off set to move the rim outwards and away from them? Quote Link to comment
thisismatt Posted February 24, 2022 Report Share Posted February 24, 2022 You went from 13's to 15's... Quote Link to comment
iceman510 Posted February 24, 2022 Report Share Posted February 24, 2022 Another factor to remember is stated rim width is not actual wheel width. The actual outside flange to outside flange measurement must be considered, as it will be greater than the 7" stated size. Maybe as much as 1" total (typical for aluminum wheels, steel may be slightly less). Quote Link to comment
datzenmike Posted February 24, 2022 Report Share Posted February 24, 2022 4 hours ago, thisismatt said: You went from 13's to 15's... Which is only the rim diameter and does not affect width or diameter. To keep the same overall tire diameter on a 15" just select tires that are 2" shorter to keep present performance and speedometer accuracy. For example A 175/70R13 is 6.7" wide and 22.89" diameter. A 175/55R15 is 6.8" wide and 22.58" diameter Quote Link to comment
thisismatt Posted February 24, 2022 Report Share Posted February 24, 2022 21 minutes ago, datzenmike said: Which is only the rim diameter and does not affect width or diameter. To keep the same overall tire diameter on a 15" just select tires that are 2" shorter to keep present performance and speedometer accuracy. For example A 175/70R13 is 6.7" wide and 22.89" diameter. A 175/55R15 is 6.8" wide and 22.58" diameter It makes a difference. An X" wide wheel combination may rub at 13" but not at 15", or vice versa depending on strut angle & spring perch location. Either way it's hard to say over the internets Quote Link to comment
Stoffregen Motorsports Posted February 24, 2022 Report Share Posted February 24, 2022 Hate to rain on the party, but if in doubt, buy one wheel and tire/ mount it up and see if it fits. Worst case, you're out a couple hundred bucks. There are wheel mock up tools that you can use with or without a tire, but they are quite expensive - https://www.summitracing.com/search/part-type/wheel-and-tire-simulator-tools 1 1 Quote Link to comment
CEAZERKHAN Posted March 3, 2022 Author Report Share Posted March 3, 2022 this all helped very much, finally found wheels that will fit. Most likely will stay with the stock for the time being but at least i know what to get when i ready to get wheels Quote Link to comment
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