Fixed Time Trial Bikes

Nice one Theo that's Steve Wigglesworths old frame,he won a fair few races on that good luck .

I need a new fork so that I can put a brake on it and a garmin mount. Eventually a slippery rear wheel. But yeah I guess you get the idea.

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I need a new fork so that I can put a brake on it and a garmin mount. Eventually a slippery rear wheel

Some pedals would be handy too.

And a rubbish bin

Student scumbag life, I only have one set of decent pedals atm and they are on my road bike.

I like the anti-burglar plug trap.

It trapped me the other day and is now on a shelf.

Ouch!

Anyway back on topic... There's a columbus tusk air chrono fork for sale in the classifieds here, how do people rate them, any bad experiences etc? I know it has slightly more trail which will hopefully serve to increase the stability of this thing when I really get the gear turning over. Also thinking of switching to 25c tub on the front (the rim is a hed stinger6) is it faster or should I go down to 20c?

Stinger is wide right? I've heard good things about narrow tyres (i.e. 20c) on wide rims, 22/23c probably a good compromise though.

Yeah it's U-shaped rather than V-shaped and the rim itself is indeed wider than the tyre.

There's a columbus tusk air chrono fork for sale in the classifieds here, how do people rate them

My go-to position when people want a 1⅛" road fork is to remind them that these are still available:
http://www.jejamescycles.co.uk/focus-full-carbon-aero-road-fork-black-orange-id81216.html

There's no reason to spend more on a lower quality second hand fork.

it has slightly more trail which will hopefully serve to increase the stability of this thing

It has slightly more offset, which means less trail and less stability. Not that it's a problem, but you might as well learn about steering geometry now so that you don't keep making the same mistake.

I see, so to increase the trail I would need a longer fork that would in turn slacken the head tube angle? Also that fork is CHEAP!

I see, so to increase the trail I would need a longer fork that would in turn slacken the head tube angle?

Or one with less offset. But don't fret about it, a PX Track frame will handle fine with anything from 30mm to 45mm fork offset if the axle to crown length is the same as the stock fork ±5mm.

My PX track rode really nicely with a 43mm rake fork.

Just seen the bank balance, fork may have to wait. No boxing day 10 for me :|

Noob question - I have an Ultegra Stages for my road bike(s) and I'd like to use it on a fixed TT build I'm starting. What are the considerations for this - I was planning on building up a PX tarck frame such as this. Ideally I'd just take the inner chainring off a 6800 crank but there's probably a reason I can't do this.

Also need to work out if the fork is drilled, but the chainline/road crankset thing is more pressing.

the chainline will probably be slightly off but otherwise will work ok. For true pimpness you'd ned one of these

For true pimpness you'd ned one of these

Only if USE start making them in 110pcd/4-bolt :-)

Ideally I'd just take the inner chainring off a 6800 crank but there's probably a reason I can't do this.

Lack of decent chainrings being the main one. For £50 you can get 5700 cranks, your Ultegra left crank will fit on the axle if you want to know how much power your left leg is making and there are plenty of single-ring specific chainrings available in 130mm/5-bolt. If you can't fix the chainline at the hub, you probably do end up having to buy a USE chainring which costs twice as much as the cranks. The other cheap option is to bolt a flat chainring onto some FC-S500/501 cranks for a 42mm chainline. In fact, if you don't need a huge gear and want to run a 3/32" chain, you don't even need to do anything to the FC-S501, just buy the 45T version and you can get up to 90" with a 13T sprocket.

Thanks for this, exactly the kind of detailed response I was hoping for and the 5700 option is one I hadn't thought of.

Is the stock outer 6800 road chainring not up to the job? Was hoping to use the 53 from my standard 6800 crankset that is now redundant (I'm swapping my compact between bikes as required at the moment) and a 3/32" chain and sprocket.

Chainline will be fairly off, and the ramped chainring will increase the chance of dropping the chain.

http://www.wolftoothcomponents.com/collections/chainrings/products/110-bcd-asymmetric-4-bolt-for-shimano-cranks ?

Won't help your chainline, and that only goes up to 44t. If your Ultegra arm is 170mm I'd go for the Alfine cranks.