6 Popular Undermount Motorcycle Mirrors (Clamp-On Type)!

What is an under mirror? Many people might want to change their mirrors because they find the standard ones on American or classic bikes unattractive. This article will introduce different types of under mirrors and recommend some, so please use it as a reference.

What are under mirrors and clamp-on mirrors?

Source: https://plaza.rakuten.co.jp/syakutorimusi/diary/201304040000/
While motorcycle mirrors are generally mounted above the handlebars, under mirrors are a type of mirror installed below the handlebars. Initially, it takes a bit of getting used to and might feel difficult to see, but once you get accustomed to it, it won't feel out of place.
Under mirrors have a significant visual impact, so they can be considered mirrors that prioritize fashionability. Some under mirrors can be mounted both above and below, allowing you to switch them depending on your mood.
Under mirrors are generally said to be a good match for American-style bikes like Harleys.

Source: https://twitter.com/hiroshi08050411/status/1243818054171029505/photo/1

Having the mirrors positioned downwards makes the handlebar area look cleaner and cooler. This custom mirror is recommended for those who prioritize appearance.

Precautions for installing under mirrors

Since genuine mirrors are not designed to be installed facing downwards, you will need to replace them with aftermarket mirrors when making this change.
When replacing with under mirrors, they are generally installed to extend forward from under the handlebars, so it's important to check if the mirrors interfere with the fuel tank or other parts when turning the handlebars.
Before installation, confirm that there is no interference. If interference occurs, it can often be resolved by adjusting the angle.
Be extremely careful with the installation angle, as not only can it interfere with the tank, but you could also pinch your hand and get hurt when turning the handlebars, such as when parking in a garage.

What are clamp-on mirrors?

Source: https://bikeman.jp/

Clamp-on mirrors are a type of mirror that attaches to the handlebars using a clamp.
The mirror is secured by passing the handlebar through a U-shaped clamp and tightening a bolt. They can be installed both above and below the handlebars, so some people use them as under mirrors.
When installing them below, just like under mirrors, it is necessary to check that they do not interfere with the tank or other parts.

What other bikes are compatible with/suit under mirrors besides American-style bikes?

Source: https://bikeman.jp/
Under mirrors suit American-style bikes like Harleys, but they also look good on vintage and cafe racer styles such as the Yamaha SR400, and classic naked bikes.

Source: https://twitter.com/nyaoyuki424/status/1242372342057037824/photo/1
This is an example of a YAMAHA 'XSR900' with an under mirror installed. The lines from the tank to the handlebars are perfectly balanced with the clamp-on mirror, creating a stylish and cohesive look. For cafe racer style bikes, having a balanced line is crucial, and installing an under mirror allows you to align the height of the seat, tank, and handlebars, making it look more stylish.

Source: https://twitter.com/yuoza2/status/969098351730831362/photo/4
This is an example installed on a YAMAHA 'WR250'. Even for supermoto bikes, protruding mirrors can detract from the sporty style, so using under mirrors to create a compact look can make it more stylish.
While under mirrors are often installed on American bikes, they can actually be adapted to a wide range of other motorcycle types. The benefits of using under mirrors include concealing mirrors that protrude from the handlebars and making the handlebar area more compact for a sportier image.
Also, choosing smaller mirrors can create a strong visual impact and tidy up the handlebar area. However, it's important to note that over-emphasizing design can compromise visibility, which is the primary role of a mirror.
There are also regulations regarding mirror size and installation, which must comply with prescribed legal values. Failure to comply can result in the bike failing its inspection or being cited for a safety standard violation by the police, so prior confirmation is necessary.

The vehicle inspection standards for motorcycle mirrors are as follows:
・The mirror surface area must be 69 cm² or more, regardless of the mirror's shape.
・For circular mirrors, the mirror surface size must be between φ94mm and φ150mm (inclusive).
・For non-circular mirrors (e.g., square), the mirror surface size must be less than φ120mm × φ200mm or φ200mm × φ120mm, and must be shaped to accommodate a circle of φ78mm.

If these sizes are not met, the mirror will not pass vehicle inspection due to a safety standard violation, so care must be taken when choosing a mirror.

Top 5 Recommended Under Mirrors (Clamp-on Mirrors)!

Source: http://iroirobike.blog120.fc2.com/blog-entry-89.html

Next, we will introduce recommended under mirrors and clamp-on mirrors.
A major advantage of clamp-on mirrors is that you can fix them in your preferred position.

VERTEX Handlebar Clamp Mirror

https://bikeman.jp/products/vari-bm03-001

The VERTEX Clamp-on Mirror has an oval (circular) mirror surface, giving the handlebars a cohesive look.
It's easy to install by simply placing the U-shaped clamp over the handlebar and tightening the bolt, and mirror height adjustment is also effortless.
It is available in chrome plating and black to match the bike's aesthetic.

KIJIMA Mini Square Mirror Handlebar Clamp Type

https://bikeman.jp/products/kj-203-9124

KIJIMA's mini square mirrors are square-shaped with rounded corners and slightly shorter mirror stems. The shorter stem means the mirror is fixed closer to the handlebar, creating a more stylish look.
Another significant advantage of the square type is that it widens the mirror's view horizontally without sacrificing visibility, allowing for conversion to an under-bar mirror.
Since it's a clamp-on type that doesn't rely on existing mirror holes, there are fewer installation restrictions compared to genuine mirrors, and you can install it while checking for interference with the handlebars or tank. It's especially well-suited for American bikes and will look great on chopper-style bikes with custom handlebars.

KIJIMA Mini Round Mirror Handlebar Clamp Type

https://bikeman.jp/products/kj-203-9170

This is KIJIMA's oval-shaped mirror.
There is also a KIJIMA mini square mirror, but you can choose between them depending on your bike's style and your preference.
Its oval shape makes it well-suited not only for classical bikes but also for cafe racer styles and scooters.
Compared to the square type, it has a versatile design that fits a wider range of motorcycle styles.
(Versatility refers to something that applies widely to various things.)

TANAX Lute Mirror 10mm (Standard Thread)

https://bikeman.jp/

Even mirrors that attach to the original mounting position can be installed as under mirrors by using a mirror stay holder.
The TANAX Lute Mirror is a stylish chrome-plated mirror with a small mirror surface, recommended for use as an under mirror.
As an under mirror, it not only creates a significant impact but also offers a highly decorative design that gives the bike a clean and cohesive look.

oberon Handlebar Clamp Adjust Mirror 75φ (Black)

https://bikeman.jp/

Bar-end mirrors, which clip onto the bar ends of the handlebars, can also be installed as under mirrors.
Please check if your handlebar shape allows for bar-end mirror installation before purchasing.
Oberon bar-end mirrors are characterized by a high degree of freedom in mirror adjustment, allowing for up, down, left, and right movement.
They are bar-end mirrors with a strong visual impact when used as under mirrors.
In addition to black, they are also available in silver.

Oberon Handlebar Clamp Adjust Mirror 75φ (Silver)
https://bikeman.jp/

Bar End Mirror Streetfighter Type 75 Black for φ25.4

https://bikeman.jp/

The key advantage is its compact size. One of the benefits of switching to an under mirror, as mentioned earlier, is the ability to make it compact. This mirror is even more compact, allowing it to fulfill its role as a mirror without being conspicuous.
Furthermore, its black color blends in with the bike, making it a subtle mirror. Since you can replace the entire bar end, try this mirror if you want a chic finish.