Bicycle Mechanics - Converting from Sram twist shifter

Because of the trouble shifting with cold-weather gloves, my wife wants me to replace her Sram 3.0 twist shifter with rapidfire-style shifters. The rear derailleur is Sram 3.0 with a 7 speed freewheel, front is Shimano Tourney with 3 chainrings (I know this is low end stuff). The Sram site states the r.d. is compatible with SRAM 1:1 shifters.

Price is a concern.

Can I use a 8 speed rapidfire shifter (Sram or Shimano) with this, or do I need to get the exact Sram shifter for this r.d.? Any other advice about how to proceed on this convertion is welcome!

Since the RD is a SRAM model (right?), you'll have to have a SRAM shifter. As the website mentions, the SRAM is 1:1 - the Shimano is not. The FD is generally not an issue since it's usually shifted via friction (no "real" detents to indicate "gears").

Because of the trouble shifting with cold-weather gloves, my wife wants me to replace her Sram 3.0 twist shifter with rapidfire-style shifters. The rear derailleur is Sram 3.0 with a 7 speed freewheel, front is Shimano Tourney with 3 chainrings (I know this is low end stuff). The Sram site states the r.d. is compatible with SRAM 1:1 shifters.

Price is a concern.

Can I use a 8 speed rapidfire shifter (Sram or Shimano) with this, or do I need to get the exact Sram shifter for this r.d.? Any other advice about how to proceed on this convertion is welcome!no, you need a Sram 7 speed ESP trigger shifter for the rear. Duno if they make such a thing. If not,then you would need a shimano 7 speed shifter and compatible RD. 8 speed cog spacing is close enough to 7 that an 8 speed sram esp shifter might work. Sram also has a trigger front shifter that will work with your current FD.

The FD is generally not an issue since it's usually shifted via friction (no "real" detents to indicate "gears").well, no not usually.

I asked Sheldon Brown about this, and here is his reply:

"The 1:1 stuff, also known as ESP is the only stuff that's compatible
with that rear derailer. They don't make any 7-speed trigger
shifters in the ESP series, only 9-speed.

You could replace the rear derailer...derailers are cheap. With a
Shimano or a non-ESP Sram derailer, you could use any Shimano shifter."

Thanks everybody for your replies and advice!

I asked Sheldon Brown about this, and here is his reply:

"The 1:1 stuff, also known as ESP is the only stuff that's compatible
with that rear derailer. They don't make any 7-speed trigger
shifters in the ESP series, only 9-speed.

You could replace the rear derailer...derailers are cheap. With a
Shimano or a non-ESP Sram derailer, you could use any Shimano shifter."

Thanks everybody for your replies and advice!Well, It's a bit irrevalent, but Sram DOES make an ESP 1:1 trigger shifter in 8 speed.