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FAQ: Tyre and Rims Specifications

 
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david
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Joined: 09 Jan 2005
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PostPosted: Wed May 24, 2006 11:40 pm    Post subject: FAQ: Tyre and Rims Specifications Reply with quote

Ok, found this site explaning every measurement and names that related to tyre and rims specifications:

NAME OF WHEEL PARTS



WHEEL SIZE



OFFSET



Quote:
The offset indicates the distance from the center of the rim to the attaching disk part (unit:m/m). As seen in the attached drawing, the offset is indicated by "+" when the fitting surface extends beyond the central line of the rim and "-" when it is falls within. Caution is required to prevent the tire from coming into contact with the fender of the vehicle or the brake caliper if the offsets are very different.


P.C.D



Quote:
The number of bolts used to install a wheel varies from 4 to 6 depending on the vehicle model (except for some vehicle type), thus the wheel to be installed should also possess the same number of hub bolt holes. P.C.D. stands for pitch circle diameter, and indicates the diameter of the circle in mm connecting the center of each hub bolt. Since the P.C.D. also varies according to the vehicle model, make sure a suitable one is selected.


CLEARANCE



Quote:
Fender clearance indicates the marginal space between the tire and the fender or body of the vehicle. Inner clearance indicates the distance between the tire and wheel and the body part which is positioned closest to the tire and wheel. Dimensions for both right and left clearance should be measured on a level surface, and the smaller value is then considered as the inner clearance.


TIRE SIZE



Quote:
1-Tire width (mm or inch)
2-Aspect ratio
3-Radial construction
4-Rim diameter
5-Load index
6-Speed symbol
7-Tire outer diameter (inch)
8-Ply rating


Source : http://www.enkei.co.jp/en/t_know.html
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