Wheels Manufacturing Handlebar Shims
Precision-machined aluminum shims that adapt smaller-diameter handlebars to modern 31.8mm stems. Black-anodized finish, laser-etched ID, and three size variants for broad compatibility.
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Product Details
Overview & Technology
Key Features
Fit & Compatibility
Who It's For
Key Features
- ✓ CNC-machined aluminum alloy with black anodized finish
- ✓ Laser-etched part ID for quick size recognition
- ✓ 1.75-inch length for secure stem clamp contact
- ✓ Variants: 25.4→31.8, 26.0→31.8, 35.0→31.8 mm
- ✓ Lightweight—adds minimal mass to the cockpit
- ✓ Designed to fit most standard 31.8mm stems
- ✓ Helps reuse older or specialty handlebars safely
Specifications
Product Identifiers
Frequently Asked Questions
How do I choose the right shim size?
Measure the outer diameter of your handlebar at the clamp area (use calipers for accuracy). Pick the variant that matches your bar's diameter (25.4mm, 26.0mm, or 35.0mm) to adapt it to a 31.8mm stem. If you're unsure, measure twice before ordering.
Are these safe to use with carbon handlebars?
We do not recommend using metal shims on carbon handlebars unless the bar manufacturer explicitly permits metal adapters. Metal shims can create hard contact points that risk damaging carbon fiber—use a carbon-compatible adapter or consult the bar maker first.
Will using a shim affect handlebar stiffness or feel?
When properly fitted and torqued to the stem manufacturer's specifications, shims distribute clamp force and have a negligible effect on overall stiffness. Incorrect installation or over-torquing can compress or damage bars—always follow torque recommendations and inspect for movement after install.
How should I install the shim?
Place the shim between the bar and stem clamp, aligning the laser-etched ID if needed, then tighten bolts evenly in a cross pattern to the stem's rated torque. Re-check bolt torque after the first few rides and inspect for any slippage or damage.
Can I reuse these shims?
Yes—these all-metal shims are durable and intended for multiple uses. Inspect them for cracks or wear before reinstallation, and replace if you notice deformation or surface damage.
Will these fit all stems?
They fit the vast majority of standard 31.8mm stems. Some stems with very short clamp sleeves or unique internal geometries may not fully enclose the shim—verify clearance and clamp engagement before final torque.
Buying Guide
When buying handlebar shims, start by measuring your handlebar diameter at the clamping area—an accurate measurement eliminates guesswork. Select the shim that exactly matches that diameter to ensure full contact with the stem clamp. Consider the clamp length on your stem; the 1.75" shim is a common length that suits most stems, but very short clamp sleeves may reduce effective contact. Avoid metal shims on carbon bars unless specifically approved by the bar maker. If you're converting multiple bikes or stock for a shop, buying the three most common sizes covers nearly every scenario. Keep torque tools handy for correct installation and re-check clamping after the first rides to ensure safe, reliable performance.
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