Proper shifting on your bicycle ride is very important for a pleasurable experience. Broken shifters can cause you to be in the incorrect gear while riding up or down a hill, or in no gear at all, which can cost considerable time and speed. The Shimano Ultegra 6500 is a high-end trigger shifter system that requires minimal maintenance. When it does require repair, it can save you money and time to do it yourself.
Loosen the pinch bolt with an Allen wrench and slide the shifter cable from the cable housings.
Remove the cable cap on the top of the shifter with a screwdriver. Be careful with this screw, as it is made from plastic and can be stripped quite easily. Push the shifter cable through the shifter and set it aside.
Loosen the clamp on the shifter assembly with a 5-millilmeter Allen wrench and slide off the assembly.
Remove the sensor cap from the side of the shifter with an Allen wrench. Remove the lever stud set screw from the bottom using a 2-millimeter Allen wrench.
Remove the lever stud by gently tapping it out with a thin Allen wrench. This bolt holds the lever to the shifter assembly. Slide the lever out of the assembly.
Pull the sensor cable out of the bracket body of the shifter. Take care to avoid damage.
Remove the cable hook from the lever assembly by unhooking it by hand. This is a cylindrical attachment securing the cable to the lever.
Remove the brackets and washers from the inside of the lever assembly by unscrewing them with the TL-ST01 tool designed for this purpose.
Slide out the washers and brackets from the lever assembly.
Note how each part comes out of your shifters so you know how to reassemble them. Check your shifter cable and cable housings for damage and replace them if necessary.