I’m having an issue with the right hand (rear) shifter on my 2002 Trek road bike. It’s a Tiagra dual brake/shifter. The release shifter (towards smaller cogs/higher gears) works OK. The shifter that pulls cable (towards bigger cogs/lower gears) seems like it doesn’t work for about 20 shifts, then works for 3 or 4 shifts, and then doesn’t work for another 20 shifts.
I tried replacing the cable (check ur cables), but that didn’t solve the issue. I’ve been planning to replace the shifter. This weekend, I thought I would try something - pull the brake lever just slightly and try shifting. It seems to work - shifts every time.
Here’s my question - can I adjust the reach on these shifters to pull the brake lever closer to the bar to see if that will make it shift consistently? I find the reach to the brake lever a bit long for my hands anyway. What does the screw on the front of the shifter do?