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Aheadset: -The steerer tube extends above the frame, the stem presses it into place along with bearing adjustment. -Lighter. -Can be easily adjusted and disassembled with allen keys. -Easier to steal. To remove the fork, the thief just need to loosen the bolts. -Riders might bang their knees on stem bolt. -More expensive (in some cases.) -Lack of height adjustability. Conventional Headset: -The steerer tube is clamped down by the top adjustment cup. The bearing adjustment is also clamped down by it. The stem is inserted inside the steerer tube. -Cheaper. -Easier to swap from stem to stem. -Less trick. -Must have headset wrenches to adjust or overhaul . Some added: Blaine Bauer [firstname.lastname@example.org] I had a normal headset and changed to an aheadset when I put on my fork (but only because my original headset was trashed). There are two improvements; a normal headset can come loose and has to be tightened regularly, and the aheadset stem makes much better contact (I never could get my original stem very tight and it tended to swing up to 90 degrees during hairy situations...having the handlebars parallel to the front wheel is an especially bad thing!). ]Blaine, you sure that you can't tighten the stem down? I have never had ]problems doing that. you just get an allen key and tourque on the bolt, ]no trick to it. Well, my problem was actually that the stem had the adjustment bolt about 2" inside the vertical part. I twisted my allen key to the point of bending, but this didn't help. Finally I got an allen key attachment for a socket wrench so I could really bear down on it, and all was well. That was why I wasn't planning on replacing it. I would recommend that you add that the normal headsets do tend to loosen (this is a common complaint especially on rigid-forked bikes). Also: - Maybe put a paragraph that the best time to convert from headset to aheadset is when replacing the fork, but it is by no means an important "upgrade". At least one convert (me) feels that there was no weight or performance difference. Since I got a suspension fork, I suspect that the loose headsets would go awaytoo. - Mention that it requires a different steering tube (which is why one would do this with the fork replacement), a new headset and a new stem. Newbees wouldn't be aware of this.