At least SGD 130K per year, I'd say. Actually you could ask for higher considering its a Lead PM role. But I don't know how they split their CTC, so the bonus component could be separate from the 130K base.

PS I don't work at Grab but i knew someone who worked there has shared salary in this range.

I checked with few of my colleagues. The salary is in the range of 170K SGD (I am assuming it is Base+Bonus + RSU) but my expectations are on higher side. Is there any other online repo/group which can help me get a fair idea.