Reading a wheel sizing chart

1. “Free Range” Offsets: These are sizing charts that allow you to choose from a “range” of offsets, rather than a preset number. Before all that though, you read the chart like any other table. As demonstrated by the purple arrow, this wheel is offered in an 18 inch (diameter) by 10 inch (width). If you look at the top of the chart, there are the following column headings: Taper Low Disk / Flat Low Disk / Flat High Disk. Each brand has a different name for its face choices, but for the most part, it will either go lowest to highest, or vice versa (obviously if it has “low” in the name, then you know it has LESS brake clearance in comparison to a “high” disk). Brake clearance and face choice is a whole other blog though. Let’s just take “Taper Low Disk,” which usually will be a rear wheel. As shown by the green arrow, you can get any offset -13 through +53. This means you can get any whole number offset, i.e -12, -11, +0, +1, and so on. The circled lip size I will be referring to is in light blue, i.e 77mm. Also, PCD = bolt pattern.

Lazy reader notes:
- Purple arrow: Wheel size – diameter (18″) by width (10″)
- Green arrow: Face choice + respective columns of available offsets
- Magenta square: PCD = bolt pattern of wheel
- Blue circle: “77″ is the wheel lip size in mm that is associated to +53 offset
- Taper Low Disk = least brake clearance (ideal for rear)
- Flat Low Disk = standard brake clearance (will clear most standard size front calipers)
- Flat High Disk = maximum brake clearance (ideal for BBK or big caliper)

2. “Preset” Offsets: These are sizing charts that allow you to choose from a “preset” offset, given to you by the sizing chart for that specific wheel. In this case, the 18×11.5 is offered in +5, -8, -16, and so on down the row. Each column represents the wheel faces that are offered, i.e “SL, NR, MD, HP.” Their respective meanings are color coded and shown below the chart. Again, it (SL, NR, MD, HP) goes from least amount of brake clearance (Super Low Disk) to maximum amount of brake clearance (Hyper Disk). At the top of the column, the 135mm refers to the lip size, and is the lip size for the 4 columns below it (i.e +5, -8, -16, and -26 all have 135mm lip size). Lip size is easy with presets, since you just figure out what diameter x width x offset you are running, and look at the column above. For example, an 18×11.5-26 (HP Face) has a 135mm lip, as well as an 18×11-14 (NR Face). An 18×12-1 (SL) has a 148mm lip, etc. Got it?

Lazy reader notes:
- Navy Blue square: Wheel size – diameter (18″) by width (11.5″) and corresponding offset choices
- Orange square: Lip sizing in mm, refers to the 4 columns of offset choices listed below it
- Magenta square: “HP” refers to the wheel face choice (i.e determines level of brake clearance), and offsets for that face choice are listed below it
- Lime green square: Usually where special notes are, in this case there are different color choices (which also can mean different prices). PCD = bolt pattern of wheel, and in this case, there are more bolt patterns possible, i.e you might be able to do a 5×120, 5×112, etc
- SL, NR, MD, HP: listed in order from least to most brake clearance

info collected from www.og-made.com