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Building first bike, need advice...(7 posts)

Building first bike, need advice...txcross
Aug 7, 2003 4:52 AM
I am going to be building up my first bike in the coming weeks. I am familiar with BB installation, cassette installation, brakes, derailleur etc... The only thing I have never done is cut down a steerer tube. So here is my question, should I do it myself or take the measurements, mark the tube and take it to my LBS to have it cut down. I have reviewed the Park Tool webset and they say to use a 32TPI hack blade and the SG-6 saw guide. I have a 32TPI hack blade but do not have the saw guide. Can I use a mitre box instead?
re: Building first bike, need advice...Rusty Coggs
Aug 7, 2003 5:03 AM
A hose clamp works too.Correct length is most important.Err on the too long side.
hose clamp fan tooterry b
Aug 7, 2003 10:00 AM
I also wrap the tube at the cut line with electrical tape before putting the clamp on.

The only additional thing I do is once I have put the stack together, made the mark on the tube and pulled it apart, I put the whole thing back together a second time and verify the cut line, paying very close attention to the fact that I have all the pieces included - HS top cap, spacers, stem.

I'm a firm believer in "measure twice, cut once" since the converse never works.
Ask Doug how important your steerer measurement is....;-) nmSpunout
Aug 7, 2003 5:25 AM
don't take measurements...C-40
Aug 7, 2003 5:39 AM
Unless you want to cut the steerer long and place spacers on top the stem, then the cut must be made accurately. The headset and stem should be assembled with the desired amount of spacers under the stem. A sharp tool can be used to scribe a line around the steering tube, at the top of the stem. Cut the steerer about the thickeness of the saw blade below this line. When reassembled, there must be a small gap between the top of the steerer and the stem, or the stem will not apply pressure to the the headset bearings. I never use a cutting guide. With a carbon steerer I carefully cut around the tube, rather than through it from top to bottom to be sure that my cut follows the line.

I made set of wood jaws to put in my vise, to insure that the steerer is not marred by the vise. Making wood jaws for a vise is easy. Get a spade bit and drill a 1-1/8" (or 1" as appropriate)hole through a short piece of 2x4 board, then saw the board in half, through the hole.
Bull...Rusty Coggs
Aug 7, 2003 7:37 AM
I depends on ones methodology and several ways work.
no bull...C-40
Aug 7, 2003 11:47 AM
Seems like our methods are quite similar. By not taking measurments, I meant not to use a scale or tape measure to try to measure various parts and come up with a total length that "should" be correct. Assembling the bike and marking the top of the stem is nearly foolproof. If you call this "measuring" then by all means, measure.

The only minor problem with assembling the bike as I do, is that a small amount of play may remain in the headset. Pushing the stem down by hand doesn't quite do it sometimes. The steerer might end up 1mm longer than intended, but that's better than being too short.