You are reading a single comment by @gfk_velo and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@gfk_velo
You will need both ProTech cups and ProTech bearings - the bearings are different - but yes, the Ekar ProTech bearings will fit in place of the SR bearings and will then mate correctly with the ProTech cups.
You will have slightly higher rotational resistance because SR bearings are CULT system and run on an oil film, wheras Ekar uses a standard steel-on-steel bearing with grease lubrication, plus the additional seals can drag more initially, than the lip seals used in the standard UT arrangement.
The sealing on ProTech is certainly more robust but it's arguable whether in road applications, compared to the standard SR arrangement, that is of great advantage because the CULT bearing system is extremely wear resistant (albeit at a cost ...)