Road Bike Shift Indicator Using Scrap Packaging
Introduction: Road Bike Shift Indicator Using Scrap Packaging
I really don’t like to cross chain. It’s never been a problem before, since I’ve always had a pretty good sense of what rear cog I’m in. But when I got a bike with a compact double after riding 12 years with a triple, it seems like I’m shifting the front so often that now it’s hard to keep track of things. So I made a shift indicator using scrap plastic that’s kind of inconspicuous, and you don’t need to remove the cable to install it.
Warning if you get frustrated fiddling around with small things until they’re just right, don’t even start this project. It’s going to move away from the fork as you change gears.
You need something that will attach securely enough to the cable,
and be visible enough to see through the window. A piece of duct tape works well. Cut it about 1/4″ wide and 1 1/2″ long and wrap it tightly around the cable.
The window needs to be about 1 1/2″ long, and wide enough to go out from the frame about 1/8″ past the cable. Cut a thin strip of black electrical tape for each limit line and stick it on the top surface of the window. How did I come up with those angles? You want the lines to look horizontal (perpendicular to the cable) when you’re looking down on them while riding. This is where you’ll need to do some experimenting to find the right positions.
If your question is Does adjusting the rear derailleur affect the reading you get from my indicator the answer is No. The indicator actually shows you which position of the shift lever you are indexed into. Adjusting the rear derailleur just brings the position of the cage and small pulleys into the correct alignment with whatever cog you are currently in, but doesn’t affect what the indicator is showing you.
Thanks for your answer.
Yes, that is my question. When you say ” Adjusting the rear derailleur just brings the position of the cage and small pulleys into the correct alignment with whatever cog you are currently in” I interpret that it means that looking at the gauge, you may think that you are using a speed when are actually using another. Is that so?