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Headset(7 posts)

Headsetchristopheclark
Sep 15, 2001 5:06 AM
I've just bought a GT ZR3 - I need to raise the handlebars - but how? There is a bolt situated vertically in the middle of the stem but its sole function seems to be to hold on a cover plate. Is this the same bolt that needs hitting downwards to release a wedge of some sort?

Please help as I am afraid to bash anything too hard for fear of doing damage.

Simon
re: HeadsetRusty Coggs
Sep 15, 2001 6:04 AM
Assuming you kave a threadless system, the bolt is the headset adjustment.If this is the case, the way to raise the bars is is with a riser stem.A threaded headset with a quill type stem that could be reaised will have 2 large nuts,one for adjusting the headset preload and another on top of it acting as a locknut.
re: HeadsetKen2
Sep 15, 2001 11:47 AM
No offense to Rusty Coggs above, but he has it backwards. The quill stem (which you certainly don't have on a new ZR3) is the type that has a single bolt, which expands a wedge inside the headtube. You are obviously familiar with this type; however tapping the threadless headset on top (which is what you have) will do nothing except perhaps damage it.

One disadvantage to threadless systems that you are encountering is that they have very limited height adjustments. Look at your stem: are there any spacers either above or below it? If there are some above, you can transfer those to below the stem and get a little rise. To do so, first loosen the bolt(s) on the side of the stem. Then when it is loose enough to pivot the stem side to side, you can remove the stem and reverse the spacers by unscrewing the top cap bolt all the way.

If there are no spacers or the switchout doesn't give enough rise, the only other choice is a new stem with more rise.
re: HeadsetDave Hickey
Sep 15, 2001 2:11 PM
If you do have a Threadless system, Your stem probably has a negative rise. That is, your stem problably slants down in the front. Unscrew your handlebars from the front face plate and remove the bars. Then remove the stem and flip it over. Instead of a negative rise, you will now have a postive rise. Reattach the handle bars.
re: Actually,Rusty Coggs
Sep 15, 2001 3:40 PM
I have nothing backwards.I have both threadless and threaded systems systems.Both have a center bolt.The threadless systems have a top cap and a bolt as he describes,and the bolt is for headset adjustment.Adittionally,one cannot just loosen the stem bolt(s) as you suggest and pull it off. The top cap bears on the top of the stem and also has to be removed.
re: backwards...Ken2
Sep 15, 2001 7:44 PM
"A threaded headset with a quill type stem that could be reaised will have 2 large nuts,one for adjusting the headset preload and another on top of it acting as a locknut." --direct quote from your earlier post. Sorry, I guess I've never seen one of those quill stems with two nuts, one for adjusting preload...

And if you re-read my post, you will see that I never suggest that you can just loosen the stem bolt(s) and pull the stem off:
"...first loosen the bolt(s) on the side of the stem. Then when it is loose enough to pivot the stem side to side, you can remove the stem and reverse the spacers by unscrewing the top cap bolt all the way." -direct quote from my post
re: Headsetchristopheclark
Sep 16, 2001 3:17 AM
Thank you guys - please don't fight - I understand now. THis is my first new bike for a few years & I had not seen the threadless headset before. I can confirm that I do indeed have a threadless A'head type and no I cannot adjust it upwards without a new riser stem.

Thank you for your help - my first question on this discussion group, I'm impressed!

Simon