North American Turbocoupe Organization



measuring backspacing
RDOG Offline
Posting Freak
#1
How do I measure backspacing I am trying to sell my 17X9and some guy is requesting the backspacing. is that from the inside of rim to the lip? I measured 50mm. Does that sound right?
1986 Turbo Coupe. Boport StageIII head, Boport 2.1, Performance Techniques 50 trim hybird, StageII.63, stinger 3" exhaust, Phenolic spacer, Boglog header,NPR FMIC intercooler setup, kirban fpr, bigrmotorsports fuel rail, diablo water meth kit, CAI, remote mount TFI, CHE rear adj control arms, MAC girdle, 8.8 rear disc, aluminum drive shaft, H&R lowerings springs Tbird Turbo Specific, y MAS!!
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Joe F Offline
Posting Freak
#2
Lay the wheel face down so the back side is facing up. Take a straight edge and lay it across the inboard wheel rim. Measure the distance from where the straight edge contacts the inboard rim to the hub mounting pad. The result is the backspace measurement.

See https://www.rsracing.com/tech-wheel.html for more info. HTH; sorry but no clue if 50mm is right or not.
JR's Place - My '87 Turbocoupe
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