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Me too! I'm hoping to go with ghetto one by 10 speed and see how I go. I'm undecided as of yet what derailleur to use as I have a few options. One option is a Shimano Deore which is long cage, which I think is ideal although I'm not sure how it would team up with a bar end shifter. And then my other option is to use a 105 5800 derailleur and bodge it with a 9/10 speed derailleur. What would you recommend?
And yes, it's a 1 1/8" steerer!
Ziggy.-
I would go with Deore and wide range personally! It'll work perfectly with 8/9/10-speed (non-SRAM) road bar ends. That's a stock setup on a lot of tourers because it's smooth and reliable. The 105 5800 only works on 11-speed unless you do friction so that would bump the cost of the shifter up by a big chunk as all the TT guys are trying to outbid you.
There'll be loads of STIs on eBay, I would guess that you could get some used Shimano 9/10-speed shifters for <£30ish, maybe on here. Or go for these. Used 10-speed bar ends don't seem very common but you can buy some (new) MicroShift ones on eBay for £40.
I reckon with a bit of patience you could get some shifters for £25 and then buy that fork off @platypus
Edit: looks like this guy has right hand 105 10-speed shifters for £15 - https://www.lfgss.com/conversations/323017/#comment14314648 just need a left hand lever single speed lever which you could easily find for £5... depends how concerned you are about them matching I suppose!
frankenbike
High hopes for this! What speed/pull ratio bar ends do you need? You can get Dura Ace 9-speed or SRAM 10-speed for <£30. Depends if you have the right derailleurs/cassettes already I guess.
Is it 1 1/8" steerer?