GIZA PRODUCTS

SM-21 Handlebar Shim (Ø25.4mm / Ø31.8mm)

Name: SM-21 Handlebar Shim (Ø25.4mm / Ø31.8mm)
Brand: GIZA PRODUCTS
SKU: 49660946024365
Price: 660.0 JPY
Availability: InStock

SM-21 Handlebar Shim (Ø25.4mm / Ø31.8mm)

¥660 JPY

~~¥660 JPY~~ ¥660 JPY

Sold out

Product variants

Quantity

Low stock

Price drop alerts

Item number: SKU:49660946024365(-38060326)

■ Domestic Shipping Fee Estimate

Select a prefecture:

Overview

The GIZA PRODUCTS SM-21 Handlebar Shim is an aluminum adapter designed to fit 25.4mm handlebars into a 31.8mm stem. Its lightweight and high-precision design make it a convenient part for handlebar replacement and ensuring compatibility in classic bike customization.

View full details

Product Description
Returns, Delivery & Shipping

GIZA PRODUCTS SM-21 Handlebar Shim (Ø25.4mm / Ø31.8mm) | Aluminum adapter connecting different handlebar diameters

A small, reliable custom part to avoid giving up on your favorite handlebars.

When customizing a bicycle, a surprisingly tricky issue is the difference in clamp diameter between the handlebar and the stem. The GIZA PRODUCTS "SM-21 Handlebar Shim" is an adjustment shim for installing a 25.4mm diameter handlebar into a 31.8mm clamp stem.

Despite its simple structure, which involves simply attaching it to the stem's clamp section, this convenient item greatly expands your options when replacing handlebars or customizing. It's also useful if you want to use your favorite classic or riser handlebars with a modern standard stem.

Made from high-precision aluminum alloy, it combines lightness and durability, with a sleek finish that blends in naturally. It's a standard item recommended not only as a repair part but also for those who enjoy bicycle customization.

Features

Adjustment shim for attaching 25.4mm handlebars to 31.8mm stems
Adapter part to resolve differences in handlebar and stem diameters
Simple structure: simply attaches to the stem clamp area
Made of lightweight, high-precision aluminum alloy
Ensures compatibility when replacing handlebars or customizing
Convenient for combining classic handlebars with modern stems
A standard item useful for repairs and reusing parts

SPEC

Brand: GIZA PRODUCTS
Model: SM-21 Handlebar Shim
Material: Aluminum alloy
Compatible handlebar outer diameter: Ø25.4mm
Compatible stem clamp inner diameter: Ø31.8mm
Width: 40mm
Weight: Approx. 22g

When you're customizing a bicycle, you often encounter situations where you want to use a 25.4mm handlebar, but your stem is 31.8mm. This shim provides a simple solution for such standard differences.

Especially in chromoly bike or old MTB customizations, there are many attractive 25.4mm handlebars, and it's not uncommon to want to combine them with modern 31.8mm stems. In such cases, having one of these is extremely convenient.

It's not a flashy part, but it's a behind-the-scenes hero that greatly expands your customization freedom. If you're considering replacing handlebars or reusing parts, this is an item you'll definitely want to have on hand.

◆Returns and Exchanges

Please inspect your order as soon as possible after it arrives.

Parts, apparel, accessories, and other cycling goods may be returned or exchanged. Return and reshipping costs are covered either by the customer or by our store, depending on the circumstances.
Complete bicycles cannot be returned or exchanged for reasons of customer preference. We will only accept returns in the event of a product defect or damage during delivery.

▶ View our Return and Exchange Policy

◆“In-store Stock” and “Special Order” Items

“In-store Stock” items are currently available at an Eirin store or in our warehouse. Each item will be inspected before being dispatched.
“Special Order” items are ordered from the manufacturer or an authorized Japanese distributor. After the item arrives, we conduct a final inspection before dispatch.

※If “In-store Stock” is unavailable, please select “Special Order.” We will contact you by email once the item has arrived from the supplier.
※If the manufacturer or distributor is also out of stock, the item cannot currently be purchased. Select the “Notify me when available” button to receive a restock notification.

◆From Order to Delivery

From order confirmation to delivery

※① If an item is out of stock, we will contact you by email and ask whether you would like to change or cancel the item.
※② Items cannot be added, changed, or cancelled after the order has been confirmed.
※③ Once your order has been dispatched, we will email you with the shipping confirmation and tracking number.

◆Shipping Carrier

Orders are generally shipped by Seino Transportation.
Another shipping carrier may be used depending on the contents of your order or the delivery area.

◆Pickup at Eirin Stores in Kyoto City

Shipping is free when you collect your order from one of our street-front stores in Kyoto City.
Complete bicycles generally require approximately 1-2 weeks for assembly and inspection before pickup.
Some parts and apparel are stored in our warehouse and may require approximately 1-5 days before they are ready for pickup.

※Due to system limitations, the following payment methods are available for store pickup orders:
Shop Pay, Credit Card, Bank Transfer, and JACCS Financing
Customers wishing to use another payment method should select standard delivery instead of store pickup.

◆Pickup at a Seino Transportation Branch

Seino Transportation branch pickup service

※Shipping for complete bicycles is free when the bicycle is collected from an eligible Seino Transportation branch.

This service is available only for complete bicycles. Parts, cycling goods, apparel, and accessories are not eligible.
For purchases under ¥55,000 including tax and excluding payment fees, the shipping charge is reduced to half of the standard rate.
Different charges apply to Hokkaido, Okinawa, and remote islands. These charges are still lower than residential delivery rates.

▶ Seino Branch Pickup Details

▶ List of Seino Transportation Branches