Bullseye Hub Spacings

We’ve owned plenty of old school Bullseye hubs over the years and have noticed that hubs often don’t have enough washers, the large spacers are installed on the wrong sides, etc.

So we thought it would be helpful to let you know exactly which axle/spacer/washer combinations are required for 100/135mm mountain bike hubs and 100/110mm BMX hubs. Enjoy!

MTB 100mm QR front hub
Shell: 76mm
1 x 109mm alloy axle
2 x 12mm alloy spacers (silver)

MTB 135mm QR rear hub
Shell: 79.5mm
1 x 143mm alloy axle
1 x 20.5mm alloy spacer (silver) for non-drive side
1 x 20.3mm steel spacer (black) for drive side
11 x steel washers (1.1mm each silver) for drive side

BMX 100mm front hub with screw in bolts/external washers
Shell: 76mm
1 x 96mm alloy axle
2 x 12mm alloy spacers (silver)

BMX 110mm BMX rear hub with screw in bolts/external washers
Shell: 79.5mm
1 x 106mm alloy axle
1 x 18mm alloy spacer (silver) for non-drive side
1 x 12.5mm steel spacer (black) for drive side