It’s obvious a vehicle owner need replacing a bad or busted tyre with a new one whereas damage to the wheel rim also necessitates instalment of a newer rim. In case of accidents that may damage both the tyre and the rim which immediately requires purchasing a new set either as a pair of separate, depending on owner.
This is equally important with a bus tyre as the driver isn’t responsible for the vehicle but every other passenger riding along. On the contrary, there’re many other important reasons to purchase wheels alongside tyres. For instance, someone who wish changing the wheel size and customise a vehicle may go for previous or existing set to match the size and other aspects.
This is important as even the slightest change may lead to uncomfortable driving experience as well as unbalancing the entire vehicle itself. Obtaining a used pair is a good option if you wish saving a great deal of money but do perform a thorough quality check. Purchasing wheels with tyres ask digging deeper for the correct measurement that guarantees perfect fit for maximum safety.
The critical measurements
Fitting a bus tyre and wheel ask for a few measurement considerations. Width and Diameter are measurements for wheels however with tyres; width, aspect ratio and tread depth are considered. Let’s breakdown the features and their details for clarity;
Wheel Rim width
It’s measured in inches and most of the tyres sold lie somewhere between 4-to-15 inches wide. Meanwhile, narrower tyres are typically spare or space-savers. Many bus tyre widths have the letter “J” imprinted followed by the actual width such as “7J”. This alphabet represents the flange shape which is most commonly “J”.
Wheel Rim diameter
This is the same as inside diameter of the tyre with normal rims ranging from 10-to-23 inches. Remember this measurement refers to the rim on which the tyre actually fits and not the outside diameter that includes the flange.
While the rim’s width is gauged in inches, for tyres it’s marked in millimetres. The tyre width ranges from 125-to-355 millimetres that can be converted to inches by dividing it by 25.4 whenever needed. Likewise, inches can be converted to millimetres by multiplying with the same figure.
Aspect ratio is actually a percentage rather than a measurement. It reflects height of the sidewall which is half the tyres width. In simple term, sidewall measurement is equal to 50 percent of width dimension. Aspect ratio can range anywhere from 25-to-85 depending on the type of vehicle.
Comparing rims to wheel hubs
It’s important for the new wheels to fasten with existing hub for which configurations are dictated by the total number of bolts present, the pattern position, distance and diameter of the bolt circle. You can measure the diameter from one bolt to the other across the hub or simply space between the two opposite bolts.
Whether it’s a bus tyre or for any other vehicle, be sure to understand the above facts when buying tyres with wheels!