Replacing fork.
 

I have a Trek 7200 hybrid. I really hate the fork on the bike. It is a 1 inch threaded fork. Can I replace it with a 1 1/8 threadless fork as long as I replace the headset?

no. the headtube is only 1" so a bigger steerer or HS will not fit.

erader

no. you must replace it with a 1 inch fork. threaded or threadless doesnt matter because you can change the headset, but it must be 1 inch.

Unlike what the other guys said, I think it is possible. But you would have to change the headset cups for certain. That's something you're not likely to be able to do on your own.

The head tube you have may in fact be too small in diameter for the larger headset cups to fit. Either way, I can't imagine what would make it worth it to switch that fork.

You're limited to 1" headsets and forks. This limits your choices, but there are still 1" hybrid/29er/cyclo-cross forks on the market. This would be a good time to go threadless too.

You can't unless you have the frame's headtube changed too. That's going to require the services of a frame builder and a new paint job. So, yes it's possible but it's way beyond impractical.

Whats the problem you're having with the fork?

The problem I'm having is it's way to bouncy with no way to adjust it or lock it out. I could live with it if I never had to climb a hill. I don't want a solid fork because I have another bike similar with a solid fork. It would be great if someone could recommend a decent fork for the bike I have, 05 Trek 7200

Are you guys sure I can't use a 1 1/8 threadless fork by replacing the headset and bearings? There are 4 Trek bikes in my family two hybrids with 1 inch treaded forks and a mountain bike and a hybrid with 1 1/8 threadless forks and the head tubes all look like the same size to me.

The headtubes are different. It is hard to eyeball .125 inches. The cups will not fit. Plus are the frame materials the same? This could cause same od and different id or the inverse.

Ridgid forks come in several styles. Low-end ridgid forks are usually very heavy, stiff and unforgiving. Lightweight chromoly butted steel forks are much more agile and bouncy but still strong enough for riding on tracks and trails.
Carbon forks can be even lighter and can absorb road buzz effectively but can be vulnerable to scratching in an everyday utility bike.
There is a nice selection at
http://www.interlocracing.com/forks.html

If the bike you want to change has a 1" headtube, headset and fork, then yes, we are absolutely sure you can't just install a 1-1/8" fork.