The Gers assistant manager hailed the team's defence after conceding just once in the last five matches.
The Gers conceded their first goal in nearly eight hours in a 3-1 victory over Greenock Morton last Friday, after four matches in all competitions without being breached.
The Scottish Championship leaders have conceded just 18 goals in 28 league matches all season long, and Weir, an esteemed centre-back himself during his playing days, says that has been a major factor in the club's success this season.
Weir told the club's website: "From those five players really – Tav [James Tavernier], Danny [Wilson], Dom [Ball], Rob [Kiernan] and Lee [Wallace] – and obviously Wes [Foderingham] in goal, as a back four and a goalkeeper it’s been a pretty settled unit and that’s really important.
"At the start of the season there was a bit criticism coming their way with regards to being a bit open and maybe conceding some goals – we’ve worked on that and I think the balance in the team is probably a little bit better now.
"I think the team has evolved, they as a unit have evolved. You must do that in football, you must do that in everything, you must always be constantly looking to evolve and get better and I think we have done that."
Rangers look certain to return to the Scottish Premiership after a four-year absence next season as they currently sit 14 points clear at the top of the Championship with just eight matches remaining.
They can take another huge stride towards promotion on Friday night when they travel to second-placed Falkirk knowing that victory would increase the gap to 17 points, with the Glasgow club still holding a game in hand over their rivals.