The Bike Rim bottom is an essential piece in the assembly of a tire and a bicycle inner tube . It ensures the protection of the chamber from contact with the rim. It avoids that the inflated pressure chamber is pierced against the spoke heads of the wheel.


However, we often have questions about rim funds: is it essential to put a rim bottom? How to choose the best bike rim background? We are trying today to give some answers to these questions.


What are the criteria for choosing a bike rim?

The bottom of the rim must be of a good width, in adequacy with the hollow of the rim of the wheel of the bicycle. Too wide, it will tend to come out of the throat. Too narrow, it will not properly cover the bottom of the rim. The chamber with the pressure will be able to penetrate to the heads of spokes.


What are the different types of bike rim?

There are two major families of products:

The sticker rim

The high pressure rim plastic

The sticker is easy to put on. In addition, it is simple to take the right diameter. A rim sticker is delivered in linear. The tape is unwound as you go. When the revolution of the rim is reached, we cut. Very practical to put, it is less easy to go out.


A plastic rim background requires more dexterity for its implementation. Nevertheless, it is the most used model. It exists in all widths, which is not the case for self-adhesive models.


Change the bike rim bottom: why?

A bike rim bottom is subject to extreme conditions. It undergoes the heating of the bearing, the pressure of the chamber and the braking deceleration constraints. Even if you do not see it, it wears out. Cyclable recommends changing the bottom of the rim at the same time as your bicycle tire .


With the new puncture protection technologies, it is more likely to die by internal pinching of the chamber than by external perforation. A bike rim of bad size or worn rim can be the cause.


What use for bike rim funds?

The rim base is available as an inner tube version and Tubeless version as a tubeless tire fitting. Tubeless versions are only needed for combination with tubeless or tubeless tires. This technology is present today mainly on MTB and racing bikes.

What’s the point of a bike rim?