Why did the Tsar of russia abdicate following the revolution of 1917 but not following the revolution of 1905

The Tsar abdicated following the revolution of 1917 but he did not abdicate after the 1905 revolution there were a number of key factors which made this happen. The two revolutions did have similarities like the fact that in both revolutions the people 'hit the streets' (went on strike), but the revolutions both had differences, these were the factors that determined the survival and the fall of the Tsar. In February 1904 war broke out between Russia and …

…had a established opposition in the shape of Stalin's communist party this meant no peaceful protest like in 1905, the protests were riots and with no backing from his army, who walked out on 12th March, the Tsar was helpless. The last reason it was successful was this revolution had and motivator and leader that man was Lenin, he had been sent by the Germans to disrupt Russia as much as possible and lead a revolution.