Shimano Ultegra ST-6501: 2/3x9 STI Levers – Repair and Refurbishment

Shimano Ultegra ST-6501 9-speed STI

The Shimano Ultegra ST-6501 are road STI levers integrating braking and shifting. They belong to the 9-speed Ultegra generation and are available in configurations compatible with double or triple chainring drivetrains, depending on the version. They are also associated with the Shimano Flight Deck system.

Common problems with ST-6501

With age, old grease can harden and slow down the internal pawls. The lever may become stiff, fail to engage correctly, not return normally, or stop clicking. In many cases, the mechanism is not broken but simply dirty or seized.

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 loose once opened, requiring more precision and meticulousness to avoid displacing small parts from 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 gear shifting.

Another delicate step involves reassembling 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 gradually to maintain the alignment of the different parts.

Reassembling the brake lever is also specific. 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 gear changes.

Repair and reconditioning

Reconditioning involves disassembling the necessary elements, cleaning old grease and deposits, checking the pawls, springs, and pivots, lubricating correctly, then reassembling and testing the mechanism.

When the essential components are intact, this intervention often allows for the restoration of smooth and reliable operation.

Shimano Ultegra ST-6501 features

Series: Shimano Ultegra 6500
Reference: ST-6501
Type: Integrated brake/shifter STI levers
Drivetrain: 9-speed rear
Front: Double or triple compatibility depending on version
Usage: Road bike
Technology: Flight Deck

Buy reconditioned Shimano ST-6501

Available pairs vary depending on the levers I recover, repair, and recondition.

View currently available Shimano Ultegra ST-6501

Have ST-6501 levers repaired

If your Shimano Ultegra ST-6501 levers are no longer shifting gears correctly, send the exact reference and a short description of the problem. Failures due to hardened grease, a blocked pawl, or a dirty mechanism are often repairable.

Frequently Asked Questions

Are Shimano ST-6501 9-speed?

Yes. The ST-6501 is part of the Shimano Ultegra 9-speed road generation.

Are ST-6501 Flight Deck compatible?

Yes, this reference is associated with Shimano Flight Deck technology depending on the configuration.

What is the difference between ST-6500 and ST-6501?

Both belong to the same 9-speed Ultegra generation, but the ST-6501 corresponds to an evolution of the range with variants and equipment related notably to Flight Deck. It is preferable to check the exact lever reference before replacement.