Shimano 105 ST-1055: 2x8 STI Levers - Repair and Refurbishment

Shimano 105 ST-1055 STI 2x8

Shimano 105 ST-1055 are road STI levers integrating braking and shifting for a Shimano 2x8 drivetrain. They belong to the 105 generation from the 1990s and remain sought after for vintage road bike restorations as well as for bikes still in regular use.

Common problems with ST-1055

With age, the original grease can harden and slow down the internal pawls. The lever can become stiff, stop clicking, return poorly, or fail to engage certain gears correctly. In many cases, the mechanism is not broken but simply clogged or seized.

A thorough cleaning of the mechanism, checking the pawls, springs, and pivots, followed by appropriate lubrication, often restores normal function.

Repair and reconditioning

Reconditioning involves disassembling the necessary components, removing old grease and deposits, checking moving parts, lubricating correctly, then reassembling and testing the lever through all gears.

When essential parts are intact, an ST-1055 can often be reliably put back into service without replacing the entire lever.

Shimano 105 ST-1055 Features

Group: Shimano 105
Reference: ST-1055
Type: Integrated STI brake/shift levers
Drivetrain: 2 chainrings / 8 rear speeds
Compatibility: Shimano 8-speed road drivetrain
Usage: Road bike
Period: 1990s

Buy reconditioned Shimano 105 ST-1055

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

View currently available Shimano 105 ST-1055

Have ST-1055 levers repaired

If your Shimano 105 ST-1055 levers are no longer shifting correctly, you can contact me with the exact reference and a short description of the problem. Failures due to hardened grease, a seized pawl, or a clogged mechanism are often repairable as long as no essential part is broken.

Frequently Asked Questions

Are Shimano ST-1055 8-speed?

Yes. The ST-1055 are designed for a Shimano 2x8 road drivetrain.

Is an ST-1055 that no longer clicks necessarily broken?

No. Old, hardened grease or a stuck pawl can be enough to prevent the mechanism from working correctly.

Are ST-1055 compatible with a Shimano 8-speed road drivetrain?

Yes. They are designed for Shimano 8-speed road drivetrains of their generation. For replacement, it is still preferable to check the complete bike setup.