How to measure Front and Rear Hub Spacing and Identify Axle Type
Help Desk Support
In case you need a wheel replaced or are looking to order new wheels you may need to measure your wheel hub. As well the type of axle the hub uses is also essential information. This is to ensure that you will receive the correct replacement part. Follow these instructions for how to measure front and rear hub spacing.
Note: Hub Size is measured universally in mm (millimeters). When providing Biktrix with your hub measurements please measure and provide the value in mm.
Refer to the images below for instructions on how to measure your front hub spacing
Refer to the below image for a "full view" of what you will be measuring
Refer to the images below for instructions on how to measure your rear hub spacing
Look at this image below for a view of each point
Some common rear hub sizes on our bikes are 170mm, 190mm and 197mm.
There are two types of front axle your bike may have: Quick Release (QR) or Thru Axle (THRU).
Quick Release (QR):
Note the flipping cam lever on one side and nub with a threaded end cap on the other
Thru Axle: There are two types of Thru Axle you might find
This type has two 6mm hex bolts at each side to hold the axle in. Depending on your axle one or both of these may be removable.
This type of axle has a cam lever to facilitate easier removal. The other end is threaded. This is a much thicker axle than a standard Quick release front axle. You must open the cam lever into the slotted insert to remove or install this axle.
There are three types of rear axle your bike may have: Quick Release (QR), Thru Axle (THRU) or Bolt-On.
Quick Release (QR):
Note: This will be thin and just a longer version of the front Quick Release axle
Thru Axle (THRU):
Note that there may be a cam lever on one end but the drive side will have a threaded slot in the frame for the axle to be inserted into. This cam lever must be flipped into the slotted ring for the rear axle to be installed or removed.