Howdy Hubbers, First off, I'm going to ask silly questions, if you're unable to help, please don't comment with rubbish as I'm trying my first ever build since swapping BMX frames in high school. Right, so I have a donor bike which is a Silverback Sierra 26" (Assuming a 2010 - 2012 region model), I bought her used a year ago after my entry lever Silverback Slade 4 650b was no longer doing the trick for me and upgrading components would have costs more in the end, unfortunately the frame was a bit bent at the right chainstay (I bent her straight and rode like that for a year until now) Then this week, I bought a Mongoose Meteore Comp Frame 26" G7 alloy, the frame is in amazing condition but I have no idea of the year model. So in my innocence I assumed it would be a simple swap between two 26er frames, this was not to be as I found out after stripping the Silverback almost bare (excluding the BB as I'm still deciding on buying a tool or not) * My first issue I bumped into was the Seatpost Diameter - this was sorted by picking a used one up from a friend, easy peasy. * 2nd issue: The headset diameters seem to differ, the silverback is a 44mm and the mongoose looks like it used just over 41mm headset It never came with headset caps so now I need to know, where do I get caps from and do I buy new bearings too? When taking the old setup apart, the top of the headset used a cartridge bearing and the bottom had a loose pack bearing with a little plastic frame to hold them (this was a surprise as I spent some time hunting down all the bearings after them spilling out when I removed the fork) Can I at the same time "upgrade" the headset to take the cartridge top and bottom or do I stick to the current setup? There are also several of these metal and plastic o-ring type of things, should these be replaced too (and what order do they go back in, I forgot because I was chasing bearings across the floor)? Further upgrades I'm planning. 1. Upgrade rear derailleur to a Shimano Zee with a 10 spd shifter (on back order) 2. Upgrade to a 10 spd casette (will deore be fine or is slx the way, 36t or 34t?) 3. Ergo - fit bike setup and new saddle (looking at the WTB options) So that's where I'm stuck at the moment, where to go next, any other issues to look out for?