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Help needed with threadless stem(2 posts)

Help needed with threadless stemDMoore
Jan 5, 2004 7:50 PM
OK - stupid question time. I've been around bikes for ages, built up lots - but I've never dealt with a threadless stem before. I need to remove a stem from my TT frame and replace it with a one-piece aerobar system (Cinelli Angel). The fork is a Reynolds Ouzo Pro, integrated headset, on a Specialized E-5 frame, if any of that makes a difference.

Taking things apart shouldn't be too tough. I assume I just unscrew the bolt in the top cap, the two bolts on the stem, and it's off. But is there something inside the fork I need to watch out for? Anything that might drop inconveniently out of position?

When it comes to reassembly, what's the sequence? Put on stem, tighten down top cap, then tighten stem bolts? Tighten stem bolts first, then top cap? Or something else that I haven't figured out?

Thanks in advance for any and all help!
park tool.comC-40
Jan 6, 2004 4:41 AM
Try the park tool website. They have good info on basic mechanics.

To answer your question, the carbon steering tube will have an expanding plug inside that the top cap screws into. Each brand of plug is a bit different, but it should not fall out.

Upon reassembly, the top cap must be tightened first, to the proper tension to eliminate all play in the headset bearings and apply a small preload tesnion. Then the stem bolts are tightened to hold the adjustment.