Wheel Lug Base Circle, 5 on 5 Only? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87chevy.com · 07-06-2010, 10:56 PM

If you measure center to center its 4.75.. but thats not the correct way to measure the bolt pattern on a 5x5 pattern. why, dont know. the correct way to measure it is top of the wheel stud to the center of the other... kinda dumb but some genius though of it .... the 6 lug folks measure center to center... normal people... haha. When I redrilled my rear rotors, I should have measured 2x and drilled once.. lol

7T2 · 07-07-2010, 12:23 AM

Quote:

Originally Posted by 87chevy.com

If you measure center to center its 4.75.. but thats not the correct way to measure the bolt pattern on a 5x5 pattern. why, dont know. the correct way to measure it is top of the wheel stud to the center of the other... kinda dumb but some genius though of it .... the 6 lug folks measure center to center... normal people... haha. When I redrilled my rear rotors, I should have measured 2x and drilled once.. lol

It's because you're measuring the diameter of the circle created by the center of all the lugs. You measure the ones opposite each other on an axle with an even number of lugs, because they are directly across from each other. You can't do this on a 5 lug axle because none of the lugs are directly opposite each other. Luckily, if you put a tape measure on the end of one lug and measure to the center of the one that is two lugs away, you will get the correct measurement.

see here for visual reference:

https://www.rsracing.com/tech-wheel.html

07-06-2010, 10:56 PM	#1
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: Wheel Lug Base Circle, 5 on 5 Only? If you measure center to center its 4.75.. but thats not the correct way to measure the bolt pattern on a 5x5 pattern. why, dont know. the correct way to measure it is top of the wheel stud to the center of the other... kinda dumb but some genius though of it .... the 6 lug folks measure center to center... normal people... haha. When I redrilled my rear rotors, I should have measured 2x and drilled once.. lol __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress Last edited by 87chevy.com; 07-08-2010 at 01:04 PM.



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