Following on from replacing the freehub bearings on my Boardman FS, a ride last week ended up with a bit of chain suck under a down shift on the front ring. This bent a chain link. Out with the Crank Bros multi tool and fitted a chain link to get home.
Decided it was time for a new chain, but the cassette was worn. So £106 for SRAM 1070 cassette (blingy) and two SRAM chains. O next ride, noticed the bigger 4 sprockets on the smaller chain ring felt 'jumpy' under heavy load (climbing). Checked mech, nothing as all 10 sprockets worked perfectly on the big ring.
Now, the big ring was replaced recently, but the inner steel ring is 4 years old. Again, as others have found, parts are a little hard to get. Same ring was £14 plus £6 postage, or the upgraded alloy ring £21 from Amazon, no post. That arrived last night, so chainset out, BB bearings cleaned and re-greased, and re-assembled.