# The WORST Mountain Bike Part You STILL Use

Source: https://www.youtube.com/watch?v=vL1gXXba0Kk
Recap page: https://rapidrecap.app/video/vL1gXXba0Kk
Generated: 2025-07-15T06:38:03.495+00:00

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## Quick Overview

Presta valves are considered the worst part on a mountain bike due to their fragile design, slow inflation process, and susceptibility to damage and sealant clogs, despite their historical advantages for high-pressure road bike tires. Modern alternatives like Schrader and new premium Presta designs offer superior durability and ease of use for mountain biking's specific demands.

**Key Points:**
- Presta valves are prone to bent shafts and accidental air release if the top nut is left unscrewed, a common issue for mountain bikers.
- Inflating Presta valves is often slow and cumbersome, sometimes requiring removal of the valve core to seat tubeless tires or due to sealant clogs.
- Schrader valves, commonly found on cars and leisure bikes, are more durable and widely compatible with pumps, leading some high-end mountain bikers to convert their rims.
- All mountain bike air suspension systems (forks and shocks) exclusively use Schrader valves due to their secure threaded connection and robust design, which is critical for high-pressure applications.
- Newer premium Presta valve designs, like Reserve Fillmore and Clik valves, offer improved airflow, clog resistance, and tool-free core removal, addressing many traditional Presta shortcomings.
- Dunlop/Woods valves, an older standard, are still prevalent in some global markets and can be inflated with Presta pumps, but are not suitable for tubeless setups.
- Clik valves are a new standard that simplifies inflation with a push-on pump head and no top nut, offering a more user-friendly experience than traditional Presta valves.

![Screenshot at 00:00: A man holding a bent Presta valve, indicating a common problem.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-00.png)

**Context:** This video explores the different types of bicycle tire valves, focusing on the Presta valve, which is commonly found on high-end mountain bikes. It delves into the historical reasons for Presta's adoption, its mechanical components, and why its design, originally advantageous for road cycling, presents significant drawbacks for modern mountain biking. The video also compares Presta to Schrader and Dunlop valves, and introduces newer Presta alternatives, highlighting their respective pros and cons for various cycling applications.

## Detailed Analysis

The video argues that Presta valves are the worst part on a mountain bike, primarily due to their fragile design and inconvenient inflation process. Presta valves, characterized by a thin, bendable shaft and a top nut that must be unscrewed before inflation, are prone to bending, accidental air release, and sealant clogs, making them slow and frustrating to use, especially with gloves or during trailside repairs. Historically, Presta valves gained popularity for road bikes in the late 1800s due to their lighter weight, narrower profile, and superior ability to hold high pressures compared to the older Dunlop/Woods and Schrader valves. However, mountain bikes have wider rims, run lower pressures, and endure harsh conditions, making Presta's original advantages irrelevant and its weaknesses pronounced. Schrader valves, common on cars and leisure bikes, are more durable, widely available, and easier to inflate, leading some high-end mountain bike manufacturers and riders to convert to them. Even air suspension systems on mountain bikes exclusively use Schrader valves due to their robust design and secure seal. Newer premium Presta valve designs, like Reserve's Fillmore and Clik valves, address many of these issues by offering higher airflow, clog resistance, and tool-free core removal, though they come at a higher cost. The video concludes that while Presta valves have a long history, their design is ill-suited for modern mountain biking, and alternatives offer a more practical and durable solution.

### Presta Valve Anatomy & Function

- The Presta valve consists of a valve stem, valve foot, lock ring (rim nut), valve core, and a top nut (plunger/shaft) that must be unscrewed to release air or inflate
- Air pressure from the tire keeps the valve seated, and pump pressure automatically opens it during inflation
- Presta valves are found on inner tubes and as standalone units for tubeless tires, and can be inflated with a Schrader pump using an adapter.

### Historical Context of Presta Valves

- Presta valves became standard for high-end bicycles after a French inventor, Sclaverand, won an award for its design at the 1893 Chicago World's Fair
- Presta valves were lighter, narrower, and more effective at holding high pressure than Dunlop or Schrader valves, making them ideal for narrow-rimmed road bikes
- Sclaverand's company, Zéfal, further embedded the Presta standard in cycling.

### Why Presta Valves 'Suck' for Mountain Biking

- The thin shaft of Presta valves frequently bends, especially if left open, leading to air leakage or difficulty inflating
- Presta valves require additional steps (removing cap, loosening top nut) which are cumbersome, particularly with gloves, and can accidentally bleed air
- Inflation is often slow, sometimes requiring core removal to seat tubeless tires, and pump heads can unscrew the valve core, causing rapid air loss.

### Schrader Valve Advantages & History

- After World War II, Schrader valves became common on leisure bikes, children's bikes, and cruisers due to their wide availability and compatibility with gas station pumps
- Schrader valves are more durable and less prone to damage from trail debris compared to Presta valves
- Many competitive mountain bikers and brands like Jones Bicycles convert to Schrader valves for their durability and ease of use, despite needing to drill out rims.

### Suspension & Schrader Valves

- All bicycle air suspension (forks and rear shocks) use Schrader valves because their threaded connection provides a more secure seal and the stem is more durable, preventing costly valve failures
- Mountain bike shocks hold higher pressures than road bike tires, demonstrating Schrader's capability for high-pressure applications.

### Alternative Presta & Other Valve Types

- Premium Presta valves (e.g., Reserve Fillmore, Muc-Off) offer improved airflow and clog resistance, often sealing at the valve foot and eliminating the top nut, but are expensive
- Dunlop/Woods valves, an older standard, are common in European and Asian markets, fit similar rim holes to Schrader, and can be inflated with Presta pumps, but are not tubeless-friendly
- Clik valves are a new patented standard that offer tool-free core installation/removal, no top nut, and push-on pump head compatibility, making them very convenient, though they require a specific pump head for accurate pressure readings.

![Screenshot at 00:00: A man holding a bent Presta valve, indicating a common problem.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-00.png)
![Screenshot at 00:09: A person attempting to pump a mountain bike tire with a floor pump, showing the valve core getting stuck in the pump head.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-09.png)
![Screenshot at 00:24: A drill creating a larger hole in a bike rim to accommodate a Schrader valve.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-24.png)
![Screenshot at 00:38: A blue beach cruiser bicycle, representing a low-end bike typically fitted with Schrader valves.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-38.png)
![Screenshot at 00:43: A mountain bike tire with a Presta valve, highlighting its common use on high-end bikes.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-00-43.png)
![Screenshot at 01:05: A finger demonstrating how to depress the plunger on a Presta valve to release air.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-01-05.png)
![Screenshot at 01:55: Historical black and white footage of early cyclists, providing context for the evolution of bicycle valves.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-01-55.png)
![Screenshot at 02:09: An old bicycle with pneumatic tires and a valve, illustrating early valve technology.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-02-09.png)
![Screenshot at 03:06: A car tire with a Schrader valve, emphasizing its widespread use beyond bicycles.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-03-06.png)
![Screenshot at 03:31: A mountain biker riding on a trail, showing the typical environment where Presta valves face challenges.](https://ss.rapidrecap.app/screens/vL1gXXba0Kk/00-03-31.png)