Two palm-sized patches of rubber are the only thing between you and the road. Here is how to read them, set them, and know when they are done.
Your bike makes power, sheds speed, and holds a line through two contact patches about the size of your palm. Almost everything else on the machine is negotiable. The tires are not. Most riders never look closely at theirs until one goes off, and by then the good decisions are already behind them.
You do not need to be a tire engineer. You need to read the sidewall, run the right pressure, and know when the rubber is past it. Here is the whole thing in plain English.
Read the Sidewall
Every number you need is moulded right into the tire. Take a common rear size, 180/55ZR17 73W. The 180 is the width in millimetres, the 55 is the aspect ratio (sidewall height as a percentage of that width), and the 17 is the rim diameter in inches. The letter is construction: R for radial, B for bias-belted, and no letter for old-school bias-ply.
The part in most people's blind spot is the 73W on the end. The 73 is the load index, the most weight the tire is rated to carry, which works out to about 365 kg. The W is the speed rating, good to 270 km/h. Match or beat the load and speed rating your bike calls for, and never mix radial and bias front to rear. Classic bikes use inch sizes like 3.00-19 or alphanumeric codes like MT90B16, so cross-reference carefully before you buy. When in doubt, the size on your current sidewall is the answer, and you can browse the full range of motorcycle tires by fitment.
Set the Right Pressure
This is the one riders get wrong most. The pressure moulded on the sidewall is the maximum the tire can take, not the number you are supposed to run. The right figure lives in your owner's manual or on the sticker by the swingarm or chain guard, and it is almost always lower.
Check pressure cold, before you have ridden, because a warm tire reads high and lies to you. Once a week is a good habit, and so is a few extra pounds when you load up with a passenger or luggage. Low pressure is what cooks a tire, kills your fuel range, and makes the bike feel vague and heavy through corners.
Know When They Are Done
Two things retire a tire: wear and age. For wear, look for the small raised bars sitting down in the tread grooves, the wear indicators. When the tread wears flush with those bars, the tire is finished, and your wet grip drops off well before that point, so do not chase the last millimetre. Cupping, flat spots, cracks in the rubber, and any cut deep enough to worry about all say the same thing. A plug is a get-you-home fix, not a repair, and it voids the tire's speed rating.
Age counts even when there is tread left, because rubber hardens and cracks as it gets old. Every tire carries a DOT date code, and the last four digits are all you need: the first two are the week, the last two the year, so 2323 means the twenty-third week of 2023. Inspect anything five years or older each season, plan to replace around the six-year mark, and treat ten years as a hard ceiling no matter how the tread looks.
Pick the Right Type for How You Ride
Tires are built for a job, and fitting the wrong kind is the quickest way to make a good bike feel bad. Sort it by how you actually ride, not the one big trip you are dreaming about.
- Sport tires warm up fast and grip hard, built for spirited road riding and track days.
- Touring and sport touring tires trade a little grip for long highway life and wet-weather stability, loaded or two-up.
- Cruiser tires are built for weight and straight-line miles, often bias-ply on heavier classics.
- Dual sport and adventure tires split their life between pavement and dirt, from road-biased 90/10 to aggressive 20/80 knobbies.
- Vintage tires keep classic bikes correct, with the older sizes and tube-type fitments modern catalogues have mostly dropped.
Breaking In New Rubber
A fresh tire is a slippery tire. Between the mould release left over from manufacturing and a smooth, un-scuffed surface, new rubber has less grip than the worn tire you just took off, and pushing hard on it is a classic way to lose the front. Give it about 160 km of easy riding, gentle on the throttle and brakes, leaning a little further each time so you scrub in the whole surface and not just the centre strip. Recheck your pressures once the tires are bedded in, and then you are good to lean on them.
Frequently Asked Questions
How do I read my motorcycle tire size?
A code like 180/55ZR17 73W is width in millimetres, aspect ratio, construction letter, rim diameter in inches, then the load index and speed rating. Match all of it to your current sidewall or your owner's manual.
How often should I check tire pressure?
Weekly, and always cold before you ride. Use the figure in your manual or on the swingarm sticker, not the maximum stamped on the tire, and add a few pounds when you carry a passenger or luggage.
How old is too old for a motorcycle tire?
Inspect tires five years and older every season, plan to replace around six years, and never run a tire past ten years regardless of tread, because the rubber hardens and cracks as it ages.
Tires are the cheapest big upgrade on your bike and the last place it pays to stretch a season too far. Read the sidewall, run the pressure your bike asks for, watch the wear bars and the date code, and match the tire to the way you ride.
When it is time, browse the full range of motorcycle tires with free shipping across Canada on orders over $279.99. For the rest of the basics, see our guides on choosing a motorcycle battery and storing your bike for winter. The right rubber, set up right, is what makes everything else the bike does possible.
