Recently did a small upgrade on my Oxygen MTB as per title.
Before starting I contacted Oxygen for the bearing/sizes, got the sizes but they didn’t have them in stock ATM and after dismantling the forks used a Vernier to double check everything then did some research on the baffling subject of numerous headset types and sizes.
22 ball bearings
- ball diameter 5/32" (3.97mm)
- cage outer diameter 40 mm
- for oversize 1-1/8" headset
Fork crown seat OD: 30.015mm
Lower head tube ID: 52.1mm
Upper head tube ID: 44.00mm
Also, got a great bargain on fleabay for some new Rockshox Recon forks, not the ultimate but not the bottom of the range either so decided to replace the existing bearings completely and keep them on the original forks and not have to remove the crown race.
Bottom Bearing: Cane Creek 40-Series IS52-30 Bottom Assembly from CRC
Top Bearing: Cane Creek 40-Series ZS44-28.6 Top Assembly from CRC
Both for 1 1/8” steerer and includes top cap star nut etc.
Set the new forks up for my weight and rebound then went for test run with no problems.
The Rockshox fork steerer tube was 60mm longer than the Oxygen version which may be cut down after more runs, but for now I’ve set the stem halfway down with extra spacers on top.
Before starting I contacted Oxygen for the bearing/sizes, got the sizes but they didn’t have them in stock ATM and after dismantling the forks used a Vernier to double check everything then did some research on the baffling subject of numerous headset types and sizes.
22 ball bearings
- ball diameter 5/32" (3.97mm)
- cage outer diameter 40 mm
- for oversize 1-1/8" headset
Fork crown seat OD: 30.015mm
Lower head tube ID: 52.1mm
Upper head tube ID: 44.00mm
Also, got a great bargain on fleabay for some new Rockshox Recon forks, not the ultimate but not the bottom of the range either so decided to replace the existing bearings completely and keep them on the original forks and not have to remove the crown race.
Bottom Bearing: Cane Creek 40-Series IS52-30 Bottom Assembly from CRC
Top Bearing: Cane Creek 40-Series ZS44-28.6 Top Assembly from CRC
Both for 1 1/8” steerer and includes top cap star nut etc.
Set the new forks up for my weight and rebound then went for test run with no problems.
The Rockshox fork steerer tube was 60mm longer than the Oxygen version which may be cut down after more runs, but for now I’ve set the stem halfway down with extra spacers on top.
