Originally Posted by 70sSanO

As others have said, the easy change is going from a 6 speed to a 7 speed freewheel.
You’ll need to know your current freewheel. If the smallest cog is 14t and the largest is 28t. Then going to 13-34 freewheel will give you a little bit higher end and about 20% lower gearing for climbing. You might have to get a 14-34 if the 13-34 can’t be found. Don’t get a Megarange where the jump is 24 to 34.