Every time, tire weight and width end up being a hassle that I handle on my own. It would be better to check the diameter as well if possible, but… I’ll skip that.
This time it’s PHANTOM™ SPORTSCOMP 110/80-18 (3.00-18) | 150/70-18 (4.00-18)
Application: 18-inch custom for classic and neo-classic motorcycles.
Measured sizes and rim widths:
Front: 110/80-18 (Rim used: 3.00-18)
Rear: 150/70-18 (Rim used: 4.00-18)
Purpose: Sharing the “real tire width” when actually mounted on a rim with air pressure, and the “tire weight alone” that directly affects unsprung weight—not catalog specs. A reference for checking chain clearance.
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Tires are surprisingly heavy. For example, when changing tire brands, if you keep the numerical specs in mind before experiencing the tire, the flavor of the tire deepens even more? That’s what I think.
110/80-18 (3.00-18) & 150/70-18 (4.00-18)
With 18-inch classic motorcycles, the front often has fender contact issues, and the rear has tight chain line clearance.
Having this kind of real measurement data makes it much easier to choose tires more specifically.
(Measured Data: Front 110/80-18) [*Front tire measurement photo] Starting with the front.
Tire size: 110/80-18
Mounted rim width: 3.00-18
Actual measured tire width: Approximately 110 mm (*measured with calipers)
Tire weight alone: Approximately 4.265 kg
(*Personal note: A word about front tire weight, which affects handling. “Surprisingly light,” etc.)
(Measured Data: Rear 150/70-18) [*Rear tire measurement photo] Next, the rear, which demands the most critical clearance.
Tire size: 150/70-18
Mounted rim width: 4.00-18
Actual measured tire width: Approximately 146.6 mm (*maximum width after air inflation)
Tire weight alone: Approximately 6.645 kg
Service Data: Actual Width and Weight of Pirelli Phantom Sportscomp (18-inch).
Tire: Pirelli Phantom Sportscomp . Sizes: Front 110/80-18 (on 3.00-18 rim) & Rear 150/70-18 (on 4.00-18 rim). Details: In classic motorcycle customization, catalog tire widths are often inaccurate when actually mounted, leading to chain clearance issues. Here is the real-world measured width and exact weight for these specific sizes. Verdict: A vital reference for mechanics and builders dealing with tight swingarm clearances and unsprung weight calculations.
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