Craig Conway's first goal for the club towards the end of the first half at the Madejski Stadium was enough for Rovers to get a valuable three points over their promotion-chasing rivals.
The visiting side had to battle hard to earn the win, with over 100 minutes played due to lengthy stoppage time at the end of the game, but Rovers showed true grit to earn the victory.
"It is a massive, massive result for us," said Spurr after the game.
"If we had got beat today they'd have been ten points in front of us. We would still have had a game in hand but it would have been a lot for us to do.
"So to get the three points and to close that gap, and with our game in hand, we need to take full advantage of that and again close the gap even more and pile the pressure on the top six.
"We are putting a bit of a run together now, that is five unbeaten, so it is obviously a positive and hopefully this is the run that we are talking about.
"With 15-16 games left, against Reading, who are occupying that sixth spot, we all knew the significance of today and we spoke about it before between ourselves.
"I thought we showed great resilience and character and stood together when they had some pressure.
"But although they did have pressure I didn't think they looked like scoring, they didn't carve us open or anything like that.
"So I think that is a massive positive and another clean sheet for us away from home. Credit to everyone, they all played their part in defending."
Rovers are back in action next Saturday when they travel to take on Bolton Wanderers at the Reebok.
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