Bicycle Drivetrain Builder

GX 10-Speed Shifter/GX 10-Speed Derailleur/10-Speed Cassette

Shifter: GX 10-Speed (SL-GX-A1)
Derailleur: GX 10-Speed (RD-GX-T21-A1)
Speeds:10 Use these numbers on a website like gear-calculator.com to find gearing that suits you and is compatible with this combo.
Max Tooth: 36
Unofficial Max Tooth: 42
Chain Wrap: 47

At least one of these combinations is supported by the manufacturer. Other combinations may work, but are not supported. Use at your own risk.

Cassettes

Cassette Part Number Support
LinkGlide 10-Speed CS-LG300-10 Not Supported, Exceeds Official Max Tooth
Shimano 10-Speed CS-HG-500-10 Not Supported
SRAM 10-Speed CS-PG-1050-A1 Supported

Compatibility Analysis

Show Compatibility Analysis

Each click of the shifter will move the jockey by 3.98 mm on average. Manufacturers generally to target a cog pitch that is between 0.7% smaller to 6.9% larger than this number.

In practice, no groupset aligns the jockey wheel perfectly for every shift. Manufacturers generally allow the chain to make up to a 1.2° angle from the jockey wheel to the cog.

Pull Ratio: 1.33
Cable Pull: 3.00 mm
Minimum Cog Pitch: 3.96 mm
Maximum Cog Pitch: 4.26 mm
Maximum Chain Angle: 1.2°
Table of relevant compatibility numbers

LinkGlide 10-Speed

Cog Pitch Versus Average Shift

The cog pitch of a LinkGlide 10-Speed cassette is 4.05 mm, which is 1.6% larger than the average shift. This value is within the typical range for measured groupsets.

4.05 mm Cog Pitch 3.98 mm Avg. Shift Range 3.96 mm 4.26 mm
Average jockey wheel movement per shift (left) compared to average cog pitch (right). Compatibility range on the right.

Worst Case Misalignment

This combination with a LinkGlide 10-Speed cassette puts the chain at up to a 0.2° angle to the cog. This amounts to a sideways difference of 0.11 mm between the jockey wheel and the cog. This value is within the typical range for measured groupsets.

0.11 mm 0.2° 1.2° max
Cog and jockey in the worst-case scenario of alignment.

(Positions and angles are exaggerated for illustration. Numbers do not include the free play resulting from the cog being thinner than the rollers.)

Cog Positions vs Jockey Positions

2024-12-08T18:15:33.430911 image/svg+xml Matplotlib v3.9.2, https://matplotlib.org/
Comparison between cog positions and jockey positions for each shift. Cog positions are measured from the outside of the dropout.

Shimano 10-Speed

Cog Pitch Versus Average Shift

The cog pitch of a Shimano 10-Speed cassette is 3.96 mm, which is 0.6% smaller than the average shift. This value is within the typical range for measured groupsets.

3.96 mm Cog Pitch 3.98 mm Avg. Shift Range 3.96 mm 4.26 mm
Average jockey wheel movement per shift (left) compared to average cog pitch (right). Compatibility range on the right.

Worst Case Misalignment

This combination with a Shimano 10-Speed cassette puts the chain at up to a 0.0° angle to the cog. This amounts to a sideways difference of 0.00 mm between the jockey wheel and the cog. This value is within the typical range for measured groupsets.

0.0 mm 0.0° 1.2° max
Cog and jockey in the worst-case scenario of alignment.

(Positions and angles are exaggerated for illustration. Numbers do not include the free play resulting from the cog being thinner than the rollers.)

Cog Positions vs Jockey Positions

2024-12-08T18:15:33.658678 image/svg+xml Matplotlib v3.9.2, https://matplotlib.org/
Comparison between cog positions and jockey positions for each shift. Cog positions are measured from the outside of the dropout.

SRAM 10-Speed

Cog Pitch Versus Average Shift

The cog pitch of a SRAM 10-Speed cassette is 4.05 mm, which is 1.6% larger than the average shift. This value is within the typical range for measured groupsets.

4.05 mm Cog Pitch 3.98 mm Avg. Shift Range 3.96 mm 4.26 mm
Average jockey wheel movement per shift (left) compared to average cog pitch (right). Compatibility range on the right.

Worst Case Misalignment

This combination with a SRAM 10-Speed cassette puts the chain at up to a 0.2° angle to the cog. This amounts to a sideways difference of 0.12 mm between the jockey wheel and the cog. This value is within the typical range for measured groupsets.

0.12 mm 0.2° 1.2° max
Cog and jockey in the worst-case scenario of alignment.

(Positions and angles are exaggerated for illustration. Numbers do not include the free play resulting from the cog being thinner than the rollers.)

Cog Positions vs Jockey Positions

2024-12-08T18:15:33.835911 image/svg+xml Matplotlib v3.9.2, https://matplotlib.org/
Comparison between cog positions and jockey positions for each shift. Cog positions are measured from the outside of the dropout.