How GXP Bottom Brackets Work: A Solution for Your Redline Monocog

When it comes to customizing your mountain bike, understanding how different components work together is crucial. In this article, we'll dive into the world of bottom brackets and explore a common issue faced by many riders - chain alignment. We'll also discuss how GXP (Groove-Integrated Non-Drive-Side) technology helps solve this problem.

The Redline Monocog, with its 110mm rear spacing and disc rotor, is a unique bike that requires some creativity when it comes to setting up the drivetrain. One of the main challenges riders face is getting the chainring in line with the freewheel. On a standard mountain bike, this isn't usually an issue, but on a BMX-inspired bike like the Monocog, the chainline can be problematic.

The GXP bottom bracket works by having a fixed NDS (Non-Drive-Side) bearing and a DS (Drive-Side) bearing that allows the spindle to 'float' horizontally. This design provides more flexibility when it comes to adjusting the chainring position. On my own Redline Monocog, I've found that using two 2mm spacers on the NDS cup helps pull the chainring in, but it still needs a bit more adjustment.

The issue is that the current crankset I'm using - a Truvativ 3x model with only one ring - requires a thin spacer behind it. Unfortunately, pushing the freewheel out too far can compromise safety, as it reduces the number of threads engaging with the hub. A solution would be to move the chainring in or the freewheel out, but this presents its own challenges.

When I pedal my bike in the stand, the noise is terrible - the chain is being pulled sideways on the freewheel and chainring teeth. This is not only annoying but also a safety concern, as it may cause the chain to pop off while riding. The key is to find a balance between chainline and thread engagement.

By understanding how GXP bottom brackets work and experimenting with different spacer configurations, riders can achieve a better chain alignment on their Redline Monocog or similar bikes. With some creativity and patience, you can enjoy a smoother ride and improved performance on your favorite trails.

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