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If you haven’t built the wheels yet (or ordered spokes) flog the hubs and get some with sealed bearings. Phil/Paul/WI/Suzue or even formula/novatech.
DA track hubs are great in dry conditions, but not sealed at all. I got caught out and rode 70 miles in the rain on mine, had to service the hubs afterwards, they were full of grit and shit.
You can add some aftermarket seals but from what I understand they don’t make that much difference, they’re just not the right choice for a bike that will be ridden in the wet.
TM
@bjf
I've never had a "nice" fixed gear bike. Let me address points raised some with ignorance, some with personal experience.
First is regarding the brake levers/bars. I have used this bar with similar brake lever many times on "audax" bikes. I normally go with the r400 but have also used the non aero 105 version. I like it.
Brake calipers came with the levers. I'm tempted to sell them and buy some 7800. Look nice and work well. I'm not decided.
The chainset/bottom bracket/headset is all things I've used before but the road ultegra version (6600 IIRC). I've picked the 7700 bottom bracket rather than the 7710. If this doesn't work well I'll just grab the heavier 105. I've used the 105 equivalent headset on a Moulton, can't get replacement bearings anymore but I wanted it to match.
Hubs, I didn't know this would of been a problem. If it's a problem down the line I'll just have to buy new hubs and replace. Most of my riding will be done in the dry as I no longer commute. The mudguards are for when I get caught out audaxing. What sealing can be added, I thought road seals worked. I've had a lot of experience with ultegra/XT hubs in the past so know how to rebuild.
Stem, didn't know it would come up as a 100mm. I was struggling to decide between the 80-90mm. Balls! Just sent them an email asking if they can swap it out, if not I'll buy the 80mm and send the 90mm back. Thank you.
Regarding the chainring size, I know it would look a bit small but I wanted it all matching and that's a good enough excuse for me.