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Ever since getting the Bianchi D.I.S.S. I’d noticed an odd rumble from the rear hub, so I’d been wanting to rebuild it. When my friend Erik placed an order with Enduro Fork Seals for some bottom bracket parts, he also grabbed a pair of 7901 RS2 MAX bearings for me, which are what Surly specifies as being required in their “New” hubs.
This is an angular contact bearing which must be fitted in a particular manner. Thankfully Surly has this document about the hubs which indicates that the black seal must go outside.
When I pulled the hub apart at first, I found that it actually had 6901 bearings in it, which means that it had at one point been rebuilt, but with the wrong part. These bearings are the same size, but being a regular bearing they probably wore rather quickly. Thankfully it didn’t take much effort to tap out the old ones, clean the parts, then reassemble and readjust everything.
I think that now I’ll go for a ride and explore a local area which I suspect to contain some dirt jumps. I’m not interested in riding them, but I would like to see what’s back in the interesting looking area. I’ll use this ride to be sure the bearings are fine, and keep thinking about whether or not I should sell this bike. Single speed is really fun, but my knees seem to ache a bit after riding hard. I’m not yet sure if this is needing to build up my legs some more, or something more damaging, and risking one’s knees for a couple of years of fun riding isn’t worth it.