Quick Summary
The RLMVGBX Bike Handlebar Stem Shim is a pair of shims for converting a 25.4 mm handlebar to fit a 31.8 mm stem clamp. It is a small bike-fitting part, so the main buying point is the size match rather than style or extras.
The shims are described as aluminium alloy with a black anodised finish and a textured surface. For a part like this, the important checks are the handlebar size, the stem clamp size and whether you need a pair rather than a single shim.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | RLMVGBX. Useful for matching the correct part listing. |
| Product type | Bike handlebar stem shim. This is a fitting part for handlebar to stem size conversion. |
| Quantity | 1 pair. Check this suits the stem setup you are changing. |
| Handlebar size | 25.4 mm. This is the handlebar diameter the shim is made for. |
| Stem clamp size | 31.8 mm. This is the stem clamp size the shim is intended to adapt to. |
| Material | Aluminium alloy. This is a relevant check for buyers who want a metal shim rather than a plastic part. |
| Finish | Black anodised finish. Useful if you want the part to blend with the cockpit area. |
| Surface | Textured ribbed surface. This is intended to improve grip between the shim, handlebar and stem clamp. |
What to Compare Before Buying
- Handlebar diameter: This shim is for 25.4 mm handlebars. Compare that with your current bar size before ordering.
- Stem clamp diameter: The stated stem clamp size is 31.8 mm. Check your stem matches this fitting.
- Quantity: The pack contains 1 pair, so confirm that this is the quantity you need for your setup.
- Finish and material: The part uses aluminium alloy with a black anodised finish. Compare that with your preference for appearance and part material.
Compatibility, Size and Fit
This shim is intended for bikes that need a 25.4 mm handlebar to sit in a 31.8 mm stem clamp. Exact fit depends on those measurements, so compare both diameters before choosing an offer.
The open C-shape design and ribbed surface are practical fitting details, but the exact stem and handlebar measurements remain the key checks.
What Else You May Need
You will still need a compatible handlebar and stem with the stated diameters. For fitting, follow the normal tightening method for your bike stem and check the finished clamp before riding.
Before You Decide
Confirm the 25.4 mm handlebar size, the 31.8 mm stem clamp size and the 1 pair quantity before you choose this part. If your bike uses a different diameter, you will need a different shim size.
