USE Seatpost Shim - SS30.9-34.9

USE seatpost shims feature a 100mm length, providing superior support for your seatpost compared t...

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Product Information

Full details

The USE Seatpost Shim is an essential component for cyclists looking to adapt a narrower seatpost to a frame with a wider seat tube diameter. Designed for enthusiasts and mechanics who prioritize frame integrity and component stability, this 100mm long shim provides superior clamping support compared to standard, shorter alternatives. While it is highly effective at bridging size gaps, users must ensure they have accurately measured their seat tube and seatpost diameters to select the correct shim size, as incorrect sizing can cause damage to the frame or component slippage.

All features

Model Part Number	SS30.9-34.9
Brand	USE

Extended Product Information

FAQs

Can I use this shim for carbon seatposts?

Yes, but ensure you use carbon-specific assembly paste rather than standard grease to prevent slipping and protect the carbon finish.

Why is the 100mm length important?

The longer 100mm length provides a larger surface area for the seat tube collar to clamp, which significantly reduces the risk of the seatpost twisting or slipping.

How do I know which size I need?

You must measure the internal diameter of your seat tube and the external diameter of your seatpost. The difference between these two numbers dictates the shim size.

Does the shim come with grease?

No, lubricant is not included. It is recommended to use an appropriate grease or friction paste based on your frame and post materials.

Will the top lip interfere with my seat collar?

The lip is designed to be low-profile and typically sits flush, meaning it should not interfere with standard quick-release or bolt-on seat collars.

Troubleshooting

Seatpost slips during riding

Verify the seatpost collar torque and ensure the seat tube is clean. If slippage continues, clean the shim and post with degreaser and reapply friction paste.

Creaking noises while riding

Remove the seatpost and shim, clean both surfaces thoroughly, and apply a fresh coat of high-quality bike grease or carbon paste.

Pros and Cons

Pros

100mm length offers superior stability and support
Top lip design prevents the shim from sliding into the frame
Corrosion-resistant anodized aluminum options available
Lightweight construction options do not add unnecessary bulk
Precision engineering ensures a reliable and secure fit

Cons

Requires precise measurement of seat tube and post
Not intended for extreme frame/post size discrepancies
Must select the specific material variant based on size needs

Setup, Compatibility & Care

To install the shim, first ensure the inside of your frame's seat tube is clean and free of debris. Apply a light layer of grease or carbon paste (depending on your seatpost and frame material) to the inner surface of the shim and the outside of the seatpost. Slide the shim onto the seatpost first, ensuring the lip is at the top, then insert the entire assembly into the seat tube. Tighten the seat collar to the manufacturer's specified torque. For maintenance, periodically remove the shim to clean off old grease and re-apply fresh lubricant to prevent oxidation or seizure of the parts.