My Cin X/A stem (26.4) will not take a Cin 26.4 bar
My Cin X/A stem has had a 26.4 bar, but I bought a NOS Cinelli 64 with cable grooves, and It will not go in the stem. My micrometer says both bars are 26.4 mm, and the new one is very close to working, but will not go. Is this a known problem?
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On the steering stem were the handle bars go through there will be a clamp. This clamp will have one, two or four bolts tht clamp the handle bar.
Depending on the type of bolt used on your bike you will need a ring, socket or allen wrench. Loosen these bolts of about two turns anti clockwise and center your bars and then tighten the bolts.
Getting Riser Bars or simply flipping the stem over or getting one with a different rise and reach might give you the added height you need. If you LIKE the handlebars, the stem is the best option as most new ones come with front loaders (detachable front caps) that allow replacement without stripping components off one side of the handlebar. In minutes a Bicycle Shop could swap any number of them onto your bike for you to try.
I would recommend you get used to the position that yields a careful compromise between aerodynamics and uprightness when needed.
behind the handle bars, where it joins to the bike is called a stem. Remove the center allen key bolt that runs down the center tube. Lift the handle bars up an inch and tighten the allen key bolt again. Your handlebars will now be a little higher for you.
Another way is to loosen the clamp bolts that hold the handlebars to the stem. With riser bars, you can twist them in the same spot and this will angle them up a little. You will have to loosen the brake/gear levers and angle them down until they suit you.
If neither of these works you can buy stems which have varying heights and lengths.
You need an Allen wrench (a.k.a. hex key) to fit the bolt head right in the middle of the handle bars. Loosen this bolt just 2 or 3 turns then tap the head with a soft hammer or block of wood and a hammer. Then pull the handle bar stem up (and all of the way out so you can see how the wedge-shaped nut at the bottom of the stem works). Look for a mark on the stem telling you how high you can safely raise the bars (you have to leave enough of the stem inside the tube so that it will be strong.) Put it back in and tighten it up. If you found this helpful, please vote. Good luck
Firstly, remove the centre lock nut on the stem. This loosens the stem/headset. Pull the handlebars up and rest them next to the front wheel, make sure the brake cables aren't being stretched too much.
You'll see there is a locknut on the headset (at the top of the frame/top tube where you pulled the stem from) and loosen this (might need a massive spanner!).
Pull offthe toppart of the headset, ball races and lower part. Replace with the gyro bottom and top parts. Grease the ball bearing if they aren't already!
Slide it together, fit the stem and you'll notice the brake lines that come with it. Undo the rear brake, run the splitter cable from the front lever to the top half of the gyro, same with the bottom half. I found putting some padded stickytape on the bars helped here as the splitter cable would 'ting' off the bars.
Undo the front brake and run it through the stem hole, through the forks and cable tie it to one fork leg.
Test the brakes, adjust where necessary and on you go pulling bar-spins for fun. Please don't land a jump with the bars half spun, it hurts....a lot!!
There are two bolts in the center of the handle-bars. One bolt (on some bikes this is actually 4 bolts) is used to clamp the handle-bars to the handle-bar-stem. You can see both ends of this bolt. If you loosen it, you can tip the handle-bars up and down, but not raise them. The other bolt you can only see the head of. Loosen this a couple of turns (don't unscrew it all the way) then give it a tap with a hammer. You will then be able to pull the handle-bar-stem completely out. Do this so that you can see the wedge-shaped nut at the other end of the bolt. You should also see a mark on the stem that indicates how high you can safely raise the stem. Put the stem back in to the desired height and tighten it back up.
I just took a look at mine, which is a 1990 "The Machine" model, and the easiest way I can tell you they although they are made with round Columbus tubing that has been FLATTENED on the sides of the top tube and the down tube where it joins the steer tube giving the tube more of an oval shape. The top tube is also flattened on the top and bottom where it joins the seat tube lug. I don't recall anyone else doing this. Mike.