4cadb1cb036448d0880ae729224e1cd3Silly Bike Boy Bearings 

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We are experts in bicycle headset bearings. With different headset and bicycle manufactures using their own codes and names for bearings, it can be a minefield trying to work out the correct bearings. We sell individual bearings and kits for bikes and headsets. Our bearings are sourced from the best suppliers, and all our bearings are tested. We are cyclists ourselves!


MH-P16H8 Headset Bearing

Inside Diameter x Outside Diameter x Depth (mm): 40 x 52 x 8

Angle / Chamfer (Degrees): 45 / 45
Bearing ID: 40mm
Bearing OD: 52mm
Bearing Thickness: 8mm
Internal Angle: 45 Degrees
External Angle: 45 Degrees
Inch Diameter: 1-1/2”
Material: Bearing Steel
Grease: Mobil XHP-222 or SINOPEC HTHS Bearing Grease
Seal: Double-sealed 2RS (2 x Rubber Seals)
Race & Balls Material: Chrome Steel 100Cr6
Cage Material: Nylon PA66

Equivalent Part Numbers: ACB52, ACB4052H8


Why Buy From Us? 

  • Performance: We have spent a long time working with bearing manufactures to find the best quality bearings for our kits. We test all bearings on our own fleet of hire bicycles 
  • Price: Our bearing kits cost less than branded bearings from headset manufacturers
  • Precision Milled: Precision milled steel cups, all our suppliers have Quality ISO standard certification
  • High Grade Grease: Only Mobil grease is used in our bearings, and packed full of the stuff, to makes sure they are up to British weather
  • Rust Protection: Where possible, our bearings have black oxide inner rings for further rust protection
  • Sustainability: We conduct our business in an ethical and sustainable manner. We reduce plastic packaging and instead use recyclable packaging. We even use a cargo bike to get to the post office!

Contact us

We can be contacted at any time through eBay messages if you have any questions on your bicycle or headset, we would be pleased to hear from you. We will respond to you within 24 hours and do our best to help you out! We encourage our customers to contact us with any questions or concerns!

Payment Via Ebay - Paypal and card payments 
Shipping Our bearings are shipped as standard by Royal Mail 2nd Class. Larger orders can be Royal Mail or Evri
Contact SillyBikeBoy@gmail.com