My Nav 300 looks like it has an adjustable stem(I think that what it's called) where the top half can me moved forward and down. I'd like to do this to give me a more leaned forward ride. But the bike has a sticker on it saying not to adjust the stem because the bolts have been properly tightened. I'm wondering if it in fact can be adjusted to different positions or if it's a two piece stem that can't be adjusted. I think I remember someone else saying they had adjusted their's. Looking for input, thanks.

I'd never recommend going against the manufacturer's attorneys' warnings, but if it's an adjustable stem, it can be adjusted. In our litigious climate, though, if you loosen the bolt, then go answer the phone and forget to tighten it before you ride, then you'll sue Trek and walk away with 12 zillion dollars. If they tell you "never, never adjust this adjustable thing," and you do it anyway, it might give help them in court.
If, on the other hand, you tightened the bolt securely, and it didn't come loose and you didn't fall, then you'd ride more comfortably. This doesn't constitute a recommendation, but I'd adjust that sucker in a second.

Adjust away.

I have a Nav 300. My first bike. I had the bike shop adjust it once or twice while it was in for other things. I'm sure that's just a "so you can't sue us" warning.

My Nav 300 looks like it has an adjustable stem(I think that what it's called) where the top half can me moved forward and down. I'd like to do this to give me a more leaned forward ride. But the bike has a sticker on it saying not to adjust the stem because the bolts have been properly tightened. I'm wondering if it in fact can be adjusted to different positions or if it's a two piece stem that can't be adjusted. I think I remember someone else saying they had adjusted their's. Looking for input, thanks.

It can be done, but I prefer the shop to adjust it for me. If you lower the bars, keep in mind you will probably need to turn them slightly so you can keep your normal hand positions. I had that done, and the only drawback was the bell had to go.

It says "properly tightened" because the bolt has a torque setting. Not many people have torque wrenches. Some people tighten until too tight, then give it one more turn. Over-tightening can strip the bolt or stem. Under-tightening will allow the stem to move around, or move suddenly if you hit a bump. It's a CYA sticker, that's all.

It says "properly tightened" because the bolt has a torque setting. Not many people have torque wrenches. Some people tighten until too tight, then give it one more turn. Over-tightening can strip the bolt or stem. Under-tightening will allow the stem to move around, or move suddenly if you hit a bump. It's a CYA sticker, that's all.

+1, set it where you like it. But I have to tell you, the factory stem on my Navigator was replaced because it creaked and popped under stress from day one. My LBS put a much better ZOOM stem on it under warranty.

Adjusted! I can't wait to ride it tomarrow.

The hex heads on the side of the stem aren't for adjusting, the one on the underside is. Just tighten it down a bit more then you can tighten it.

I only had time for a 12.4 mile ride this morning. The adjustment felt great. I didn't go all the way forward but after my ride today I plan to adjust it as far as it will go.

+1, set it where you like it. But I have to tell you, the factory stem on my Navigator was replaced because it creaked and popped under stress from day one.

Can you be more specific. My handlebars have been creaking for quite awhile now. Where was the crack?