Motorcycle and ATV Parts and Tires

Reading a tire size: width, ratio, rim and load range

A tire code such as 215/55R16 gives the section width in millimeters (215), the aspect ratio of sidewall height to width (55), radial construction (R) and the rim diameter in inches (16). The rim diameter must match your wheel exactly. Load range letters, such as D (8 ply), E (10 ply) or F (12 ply), and XL or SL on car tires, show how much load and pressure the tire can take, and trailer tires need a combined load capacity at or above the axle rating. Sidewall styles, like black or white letters, are cosmetic.

Parts by system: helmets, batteries, controls and body panels

The rest of the area is organized by system, so go straight to the one you need. A DOT motorcycle helmet should carry the DOT mark and fit snugly with no pressure points. Replacement batteries must match voltage, capacity and terminal layout. Controls, grips and footpegs fit by handlebar diameter and bike model, and fairings, fenders and body panels are specific to one make, model and year, so check compatibility by part number before buying.

Questions about Motorcycle and ATV Parts and Tires

What does load range E mean on a trailer tire?

Load range E is a 10-ply rating, meaning a higher load and pressure capacity than load range D at 8-ply. The sidewall states the maximum load and pressure, and the combined capacity of all tires should exceed the loaded trailer weight.

Can I use a car tire on a trailer?

Special trailer (ST) tires have stiffer sidewalls for carrying loads and resisting sway, so they are preferred for trailers. A car tire can be used only if its load rating, size and speed rating suit the axle and the manufacturer allows it.

What does a DOT mark on a helmet mean?

It shows the maker states the helmet meets the US Department of Transportation safety standard for motorcycle helmets. Look for the sticker on the back and a snug fit; a helmet should not rotate on your head, and should be replaced after a significant impact.