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- Vespa Modern
- KÜBLER Rear ABS Sensor Wheel, Z=46, Silver (13-inch conversion) for Vespa GTS 125-310, GTV 300-310
13 inches instead of the standard setup – anyone consistently converting a Vespa GTS or GTV to larger wheels needs to think beyond just the rim and tyre. The electronic wheel speed detection also has to match the changed wheel size. This is exactly where the KÜBLER Racing tone ring with 46 windows comes into play.
The silver ABS sensor ring was developed for converting the rear wheel from 12 to 13 inches. Its Z=46 geometry changes the pulse sequence transmitted by the wheel speed sensor to the ABS/ASR electronics. This makes the tone ring a crucial component for a technically coordinated 13-inch conversion – small and unobtrusive, but of central importance to the electronics.
ABS and ASR operate using the wheel speed signals. The tone ring rotates with the rear wheel and its regularly arranged windows pass the wheel speed sensor. From this pulse sequence, the vehicle electronics can determine the wheel speed.
When changing from a 12-inch to a 13-inch wheel configuration, the effective rolling circumference changes. The KÜBLER Racing tone ring therefore uses an adapted design with 46 sensor windows. This means the conversion is not simply about fitting a larger rim – the signal detection relevant to ABS and ASR is also incorporated into the overall conversion concept.
The tone ring is designed as a flat, slotted metal disc. Around its outer section are 46 evenly arranged rectangular windows. Five mounting holes are positioned around the large, distinctively contoured central opening.
The construction is deliberately reduced to the essentials: very little visible technology, yet a crucial function. Once installed, the sensor ring largely disappears into the rear wheel area. What remains is exactly the kind of detail that distinguishes a properly engineered 13-inch conversion from a purely visual modification.
The images also underline the uncompromisingly technical character of the component. The surface has a silver finish, while the cut edges of the numerous sensor windows remain clearly visible. The markings “KB-Racing 46” and “only for race” are applied directly to the tone ring.
No show, no unnecessary decoration – this component is entirely focused on its function within the ABS/ASR system.
When used on Vespa models from Euro 5+ onwards, the tone ring on the front wheel must also be replaced with a version featuring the same number of windows. The front and rear tone rings must have an identical number of windows.
This point is particularly important when carrying out the conversion. The vehicle systems compare the wheel speed signals from the front and rear wheels. Different numbers of windows on the two tone rings would generate different pulse patterns and are therefore not a suitable combination for these models.
On vehicles equipped with ASR, the system must be recalibrated after the conversion. This allows the ASR to be adapted to the changed wheel configuration. Recalibration is part of a professionally performed conversion and should be carried out after changing the tone ring or wheel configuration.
The Z=46 tone ring is intended for corresponding 13-inch conversions on Vespa GTS and GTV models. Vehicle applications include Vespa GTS 125–310 and Vespa GTV 300–310. The relevant ABS/ASR configuration of the vehicle and the correct coordination of the complete wheel conversion must be taken into account.
The tone ring itself is visibly marked “only for race”. It is a component intended for racing and tuning applications. It has no approval for use under the German StVZO and is not permitted for use on public roads in Germany.
A 13-inch conversion noticeably changes the appearance of a large-frame Vespa – larger wheels give the GTS and GTV an even more purposeful and technical stance. But a convincing conversion does not end with the rim. It is often the less obvious components that determine whether the complete concept has been properly thought through.
With its 46 sensor windows, the KÜBLER Racing tone ring integrates the ABS/ASR wheel speed detection into the 13-inch concept. Precise, functional and uncompromisingly focused on the conversion – exactly the right detail for a Vespa where larger wheels are not only about looks, but about a technically well-engineered setup.
