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Old 02-09-09, 11:25 PM   #1
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Project question: fork and BB

My first ever bike-building project... enthusiastic, but partially confused...

It's a Columbus SLX frame w/o a fork, and I intend to get a carbon one (reason being that in my last thread I was convinced it'd be better to get a carbon fork and 700c wheels to have more choice -- do the carbon forks that take 27" wheels even exist?).
The steerer tube is 22 cm long (and diameter is 1"), and it's a 63cm frame -- how long of a fork do you think I need? For example, would this one be okay:
Also, I was told by the previous owner that the frame requires an Italian ITA 70mm bottom bracket -- any recommendations there? Anything I should know? Would something like this be fine (or necessary?):|294%3A50
And would I HAVE TO use a 10-speed setup if I got this bb? (I suppose I wouldn't have to get everything Dura Ace.)
Or maybe this one:|294%3A50

Will appreciate any help you can offer.
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Old 02-09-09, 11:42 PM   #2
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Ugh.....Thats a big can of worms.....
Fork: I don't recall one for 27" rims. In order to determine the steer tube length you need to know the stack height of the headset you intend to use. I assume you're going threadless? Then add the length of the bikes headtube to the stack height and you'll have your criteria for a fork. I say get the longest you can find over your 22cm measurement and have a shop cut it to length after the headset is installed. Easy cheesy.
BB: The 70mm is correct. However the length and taper (or proprietary mating surface) of the spindle depends on the crank you intend to run. Know what cranks you're gonna use?
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Old 02-09-09, 11:59 PM   #3
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I doubt that you'll find a carbon road fork long enough to reach around 27" wheels. A cyclocross fork might work, though.

Steel forks with threaded steerers are available, and you're more likely to find one that can fit a 27" rim with a fairly narrow tire. To determine threaded steerer length, add 4-5 cm to the length of your head tube, depending on the stack height of your headset. Check this search forks.
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Old 02-10-09, 01:35 AM   #4
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If you are still thinking of going 27's you may want to make sure there is sufficient clearance in the back for that size, otherwise you might end up needing to deflate your tire to get the wheel on and off.
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