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Italy's Polini has unveiled a "double phonic wheel" (correction sensor) kit for the Vespa GTS 310. The part is designed to fix speedometer readings on Vespas that have been tuned to go faster, correcting for the inaccurate speed display that results.
It's low-key, but it's a genuinely rational item. Once tuning changes the speed range, sensor readings go off too. A dedicated kit corrects for that. It's a part that pays off in the practical matter of numerical accuracy, not looks. Properly squaring things up after making it faster - I can't help liking that kind of behind-the-scenes work.
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Why does the speedometer even go off in the first place when you tune it?
The stock speedometer is built assuming a specific pulley ratio and tire diameter, so changing the drivetrain shows that mismatch directly in the display.
I'm just plain interested that the GTS 310 can be tuned to get this fast.
A correction kit being sold separately too means the total tuning cost just keeps ballooning.
Going by the name 'dual phonic wheel,' I'd guess it's a mechanism that corrects the sensor-side pulse count to match actual vehicle speed.
The article's ambiguous about whether this assumes legal tuning or illegal modification in the first place.
The fact that Polini's officially putting out parts for it suggests this is a market where tuning demand is fairly officially acknowledged.
The speedometer reading going off because of how much faster tuning made it is a common story in the scooter tuning scene generally, not just Vespa.
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