Shimano Clamp Band Adapter - 34.9mm | Large

Shimano Clamp Band Adapter - 34.9mm | Large Shimano

Shimano Clamp Band Adapter - 34.9mm | Large

Shimano Clamp Band Adapter - 34.9mm | Large

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What is the Shimano 34.9mm clamp band adapter for?

This is Shimano's large 34.9mm clamp band adapter for front derailleurs, allowing a braze-on style front derailleur to be mounted on frames with a 34.9mm round seat tube. Many high-performance carbon and aluminum frames use 34.9mm seat tubes, and without this adapter a braze-on front derailleur cannot be installed. The adapter clamps securely around the seat tube and provides the correct braze-on mounting tab geometry for Shimano front derailleurs. A small but essential fitting for builds that require this seat tube diameter.

For 34.9mm seat tubes. Compatible with Shimano braze-on style front derailleurs. Verify your frame's seat tube diameter and derailleur mount type before ordering.

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$17.99
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  • Estimated delivery: Aug 19 - Aug 23

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more details:

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Specs

Type: Front derailleur clamp band adapter / shim

Outer Diameter: 34.9mm (seat tube side)

Inner Diameter: 31.8mm (derailleur clamp side)

Compatible: Shimano front derailleurs with 31.8mm clamp band

FAQ

What does the 34.9mm clamp band adapter do?: The adapter is a 34.9mm to 31.8mm shim that allows a 31.8mm clamp-band front derailleur to mount on a 34.9mm seat tube without slipping.

Is this adapter compatible with all Shimano front derailleurs?: Yes. The adapter is universal across Shimano front derailleurs that use a 31.8mm clamp band, regardless of road or MTB designation.

Why would I need a 34.9mm seat tube adapter?: Many modern frames use 34.9mm seat tubes for better stiffness and cable routing, but most front derailleurs are still produced in 31.8mm. The adapter bridges this gap without requiring a different derailleur.

Best For

Mechanics and builders mounting a 31.8mm clamp band-style front derailleur to a 34.9mm seat tube, or shimming any Shimano front derailleur onto an oversized seat tube.

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