ITALCERCHIO

FAQ

Change your rims

Drive Safely!

On the ”classic bikes” you’ll find varying codes which don’t always match to today’s ones e.g.

 

“2 3/4 x 18” or “2.75 x 18” 

2.50 = nominal tire width in inches
18 = nominal fixing diameter of rim in inches



The tire ”size” is nowadays defined by a code found on the side e.g.

120/70 R 17 M/C 58 H 

120 = nominal tire width in millimeters
70 = nominal ratio (ratio between height / width in percentage: i.e 70% of 120=84mm)
R = it reflects the kind of tire, here it means radius
17 = nominal rim fixing diameter in inches
M/C = motorcycle
58load index
H = max. speed index (in this case upto 210 km/h).

Other eventual elements found on tire could be ”DOT” (Department of transport USA e.g. American homologation), four figures referring to production date (week/year), an arrow denotes wheel rotation etc..

A rim is universaly identifiable if you know:

  • raw material (steel,alloy, etc.)
  • surface treatments (painting, chrome plating, anodize etc..)
  • section type (UNI, AS, FS, WO, MT, WM..)
  • section (in inches)
  • diameter (in inches)
  • number, position, diameter of holes and bulges
  • punching characteristics (English/ Italian)
  • punching degrees (based on wheel hub)
  • valve hole
  • hub sort and size
  • offset
To identify the punching, you must look at the rim in the section of the valve hole:
A ”English” Punching compared to valve hole, the spokes /nipples are left pointing (see photogragh A)
B ”Italian” Punching compared to valve hole, the spokes /nipples are right pointing (see photograph)
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To measure offset, place the wheel (hub side) on a level surface and measure from surfave to rim’s outer edge; add half of the rim width.

Please Contact us for any specific question

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