# Double synchroniser – SSP 237 Manual Gearbox 02T

> The double synchronisers of 1st and 2nd gear: three friction faces, about 50 % more synchroniser performance and almost half the shifting effort.

- Web page: https://catalog.polo.blue/self-study/ssp-237-manual-gearbox-02t/double-synchroniser/
- Original document (PDF): https://cdn.polo.blue/files/SSP237-Manual-gearbox-02T.pdf

## Double synchroniser for 1st/2nd gear

![Double synchroniser for 1st/2nd gear (237\_023)](https://catalog.polo.blue/instructions/ssp-237/b7d2bd799c89cd6d.webp)

Before a gear on the input shaft is engaged with a gear on the output shaft through the synchromesh body and the sliding sleeve, it is first of all necessary to synchronise the gears. The gears are synchronised during the gearshift via a taper on the gear and on the sliding sleeve of the synchromesh body.

![Double synchroniser for 1st/2nd gear (237\_021)](https://catalog.polo.blue/instructions/ssp-237/0d2c9192cd1b8171.webp)

This near-doubling of the area of the tapered friction face increases synchroniser performance by approx. 50 % and almost halves the shifting effort required.

The result is an improvement in operating comfort during down-changes from 3rd gear into 2nd gear and from 2nd into 1st gear.

![Double synchroniser for 1st/2nd gear (237\_022)](https://catalog.polo.blue/instructions/ssp-237/82528f9b6128a621.webp)

The double synchronisers for each gear consist of

- a synchroniser ring (inner)
- a tapered ring
- a synchroniser ring (exterior).