Shimano Ultegra ST-6500: 2x9 STI Levers – Repair and Refurbishment

Shimano Ultegra ST-6500 STI 2x9

The Shimano Ultegra ST-6500 are integrated road brake + shift STI levers for 2x9 drivetrains. Very common on road bikes from the late 1990s and early 2000s, they remain sought after for restorations, vintage builds, and bikes still used daily.

Common problems with ST-6500

With age, the original grease can harden and retain dust. The mechanism can then become slow, stiff, or no longer engage correctly. Common symptoms include a lever that no longer clicks, irregular shifting, slow return, or a control that works in one direction but not the other.

Disassembly and reassembly of Shimano Ultegra ST-6500 / ST-6501 / ST-6510

The mechanisms of the Shimano Ultegra ST-6500, ST-6501, and ST-6510 are more delicate to disassemble and reassemble than some older models. A large part of the mechanism is free once opened, which requires more precision and meticulousness so as not to move small parts out of their original position.

One of the most important points for the proper functioning of the lever is the correct positioning of the return spring. This spring allows the toothed part of the mechanism to return to its initial position. It must be correctly positioned and tensioned, without excessive preload.

The part I most often find damaged in this mechanism is a thin washer located directly above this spring. When it is deformed, even slightly, it can prevent the mechanism from working correctly and block shifting.

Another delicate step concerns the reassembly of the black washer located between the toothed elements. It must be correctly engaged on its support point while maintaining the spring tension. This operation requires working progressively to maintain the alignment of the different parts.

The reassembly of the brake lever is also particular. To correctly re-tension the spring and position it on the lug that maintains this tension, I use a string, which allows me to pull the spring with enough control during assembly.

On these models, the difficulty therefore comes not only from cleaning the mechanism, but above all from respecting the exact position of the washers, gears, and springs during reassembly. A single misplaced or slightly deformed part can be enough to prevent shifting.

Repair and reconditioning

Reconditioning includes disassembling the mechanism when necessary, cleaning old grease and deposits, checking pawls, springs and pivots, appropriate lubrication, reassembly, and then a full shifting test.

The goal is to keep original Shimano parts as much as possible and restore the mechanism to reliable working order.

Shimano Ultegra ST-6500 Features

Series: Shimano Ultegra 6500
Reference: ST-6500
Type: Integrated brake/shift STI levers
Drivetrain: 2 chainrings / 9 rear speeds
Usage: Road bike
Period: Late 1990s / Early 2000s

Buy reconditioned Shimano ST-6500

Available pairs change regularly depending on the parts I acquire and recondition.

See currently available Shimano Ultegra ST-6500

Get ST-6500 levers repaired

If your Shimano Ultegra ST-6500 levers are no longer working correctly, you can contact me with the exact reference and a short description of the problem. A large part of failures related to dirt, hardened grease, or a seized mechanism can be repaired as long as no essential part is broken.

Frequently Asked Questions

Are Shimano ST-6500 9-speed?

Yes. The ST-6500 is a Shimano Ultegra STI lever designed for a 2x9 road drivetrain.

Is an ST-6500 that no longer clicks necessarily broken?

No. Very often, the mechanism is simply dirty or blocked by old grease. Cleaning and reconditioning may be enough to restore its function.

What is the difference between ST-6500 and ST-6510?

Both belong to the 9-speed Ultegra generation, but some versions and configurations differ. It is important to check the exact reference written on the lever before replacement or repair.