iRC VX40 120/90-18 65M WT バイク

The product you mentioned appears to be a motorcycle tire, specifically the IRC iRC VX40, which is sized 120/90-18 with a load index of 65M and is likely a "WT" (which typically stands for "wide tire").
This tire size indicates that it has a width of 120 mm, an aspect ratio of 90% (the height of the tire's sidewall as a percentage of its width), and is designed to fit an 18-inch wheel. The load index of 65 indicates that the tire can carry a maximum load of about 290 kg (or roughly 640 lbs), and the speed rating "M" suggests a maximum speed of up to 130 km/h (approximately 81 mph).
IRC is a well-known manufacturer of motorcycle tires, and the VX40 is likely designed for off-road conditions, possibly suitable for dual-sport or adventure bikes. If you need specific information regarding performance characteristics, compatibility, or other details, I would recommend checking the manufacturer's specifications or contacting a tire dealer for more tailored advice.