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Not sure if this will help but I'll try,,
A tire w/ a size of 255/60/15 means that the tire is 255 mili-meters WIDE/ the distance between the tread & the bead is 60% (or 153mm tall) of the 255/ & 15 is rim diameter. When you have a 255/70 mounted,, you have the same width tire on the rim but now you're 10% taller (hence the rubbing 'cause your overall diameter is larger). Different manufacturers also measure the tires at different points,, some measure true tread width (footprint that will be touching the ground),, while others measure the tire at the widest point (usually about 1/2 way between the bead & the rim). 2 tires of the same size made by 2 different companies can look like totally different widths,depends on the measuring method. This link may also help a bit,,,
http://www.discounttire.com/dtc/brochure/info/helpDeskSidewall.jsp
A tire w/ a size of 255/60/15 means that the tire is 255 mili-meters WIDE/ the distance between the tread & the bead is 60% (or 153mm tall) of the 255/ & 15 is rim diameter. When you have a 255/70 mounted,, you have the same width tire on the rim but now you're 10% taller (hence the rubbing 'cause your overall diameter is larger). Different manufacturers also measure the tires at different points,, some measure true tread width (footprint that will be touching the ground),, while others measure the tire at the widest point (usually about 1/2 way between the bead & the rim). 2 tires of the same size made by 2 different companies can look like totally different widths,depends on the measuring method. This link may also help a bit,,,
http://www.discounttire.com/dtc/brochure/info/helpDeskSidewall.jsp
EdelBrock Performer w/ 750 doub pumper,port/polished heads, triple cut valves w/4th cut down the throat of the exhaust valves, 286 Comp Magnum cam, 1.6 roller rockers, ball-peen pushrods w/guides, screw in rocker studs w/girdles, Comp double-roller chain, , hi-rise valves covers w/ spacer (needed for the girdles), Flowtech by Holley long-tube ceramic coated headers into Stage II pipes (no cats), chrome wire looms for the MSD 8.5 mm wires, MSD 50,000v coil kit w/advance springs, cap, rotor, module, steel-braided radiator,heater,vacuum hoses, Infinity Kappa 4x6 plates (dash), Sony Xplode 6 3/4" (rear), chrome T-stat housing, A-arm shields, B&M Hammerhead shifter
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in Forum: C3 Engines, Driveline and Handling
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