How to Measure Your Bike for Pitlocks
How to measure for the Wheel Skewers
- Remove your wheel (the image below shows the wheel attached to make it clearer)
- Measure the distance between the outside clamping surfaces of the dropouts
- Repeat the process for the other wheel; the front is generally narrower than the rear

How to measure for the Ahead Lock
- Remove your existing top cap by unscrewing the allen head bolt in the center.
- You should see something like in the image below
- Measure either the inside diameter of the stem (shown in green), or outside diameter of the steerer (shown in red)

When adding a Pitlock set that includes the Ahead Lock to your shopping cart, you will be asked to specify the diameter of your steerer and the color (black or silver) of the top cap you would like.
How to measure for the Seatpost skewer/clamp
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If your existing clamp/collar has nice, flat , relatively parallel clamping surfaces on both sides that the Pitlock skewer can clamp onto, and the hole is at least 5mm in diameter then you'll only need the Pitlock skewer includes with the sets. Make sure that you measure the distance between the clamping faces to ensure that you order a long enough seatpost skewer.
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If your existing clamp/collar has an integrated quick-release or uses a proprietary bolt such that you don't have two nice, flat, parallel clamping surfaces, or the hole is less than 5mm in diameter, you'll need both the seatpost skewer and a Pitlock seatpost clamp/collar.
NOTE: The standard length Pitlock seatpost skewer will fit all sizes of Pitlock seatpost clamp/collar.
How to measure the length of a Pitlock skewer
Be sure to keep in mind that the Pitlock skewer needs to be approximately 10mm longer than the installation width to accommodate the locking mechanism.
Use these measurement guides for your axles:
Standard Pitlock axles:
Type |
Minimum installation width |
Maximum installation width |
Length of entire axle |
VA 119 |
104 mm |
119 mm |
129 mm |
HA 155 |
140 mm |
155 mm |
169 mm |
SA/LA 33 |
18 mm |
33 mm |
43 mm |
SA/LA 23 |
8 mm |
23 mm |
33 mm |
Longer Pitlock axles:
Type |
Minimum installation width |
Maximum installation width |
Length of entire axle |
VA 130 |
105 mm |
130 mm |
140 mm |
HA 170 |
155 mm |
170 mm |
180 mm |
SA/LA 45 |
30 mm |
45 mm |
55 mm |
SA/LA 60 |
45 mm |
60 mm |
70 mm |
Universal axis 240:
Minimum installation width |
Maximum installation width |
Length of entire axle |
10 mm |
240 mm |
Continuous axle thread |