What are the detailed tire dimensions of Dahon P8?
3 Answers
The international standard specification for the Big Apple tires on Dahon P8 is 50-406, so the tire circumference is: (406 + 50 x 2) x 3.14159265 = 1590 mm (rounded). Here is some information about the tires: Composition: Tires are usually composed of three parts: the outer tire, inner tube, and flap. The inner layer of the tire body has a rubber layer with good airtightness and requires special rims. The structure of tires worldwide is evolving toward tubeless, radial, flat (with a small ratio of tire section height to width), and lightweight designs. Outer Tire: The outer tire consists of the carcass, buffer layer (or belt layer), tread, sidewall, and bead. The cross-section of the outer tire can be divided into several distinct areas: the crown area, shoulder area (tread slope), flex area (sidewall area), reinforcement area, and bead area.
As someone who has been repairing cars for over a decade, I know that the standard tire size for the Dahon P8 is 20×1.75 inches, which means a wheel diameter of 20 inches and a width of 1.75 inches. Converted to millimeters, it's approximately 406×44, conforming to the ETRTO standard specification. Choosing the right size is crucial for riding—too wide increases rolling resistance, affecting speed and fuel efficiency, while too narrow may lead to instability. Tire pressure should be maintained between 55-65 PSI; too high risks blowouts, and too low accelerates wear. When riding the P8 myself, I found the stock tires have good wear resistance but shallow treads result in poor drainage, making them unsafe in the rain. Upgrading to puncture-resistant tires can reduce the risk of flats. When replacing tires, always buy the same size to avoid compatibility issues—it's a simple operation of loosening screws for removal and installation. Incorrect sizing may lead to poor handling. Regularly checking tire pressure and testing it before long trips is common sense.
As a cycling enthusiast, I often help friends repair their bikes. The Dahon P8 comes with standard 20×1.75-inch tires. Size directly affects the riding experience - the 20 indicates wheel diameter while 1.75 is the width. Different widths significantly impact comfort: narrow tires like 1.5-inch accelerate faster but feel bumpy, whereas wide tires are more stable but less suitable for high speeds. The factory size makes replacement convenient as major brands keep them in stock. When riding, pay attention to tread wear - replace them when too shallow to avoid slipping in rain. Maintain proper tire pressure around 60 PSI (measurable with household pressure gauges) - neither too high nor too low. If switching to narrow tires, be aware of reduced wheel grip - safety first, beginners shouldn't change blindly. Choosing the right size ensures worry-free and safe riding while extending tire lifespan.
