To all readers:
If your wheel is out of true, take it to a bike shop and get it re-trued.

If you think you've got the wrong gear, try something different, don't ask supid questions here. We are not riding your bike on your streets, we do not know what is appropriate and what works for us won't suit you anyway (different engines).

People who imagine fg is only for campuses and going to the pub need to get a life and ride their bikes. Getting a decent fg bike would probably change their ideas too. Taking the terms fixie and hipster out of the popular vocabulary hasn't served to improve the standard of a lot of bikes.

If you can't spin to a cadence of 150 and hold it on a downhill (doesn't have to be a mountain), get your technique sorted out. If you can't hold 120 on the flat, get your technique sorted and do more than ride to the pub on your fg because your fitness sucks. If this fat old duck can do it, you lot can.

OP. Maybe you're for real, but you're showing a lot of classic troll signs. I've only replied to answer some of the other posters above. You may not be a troll but, rather than making claims to the contrary, ask questions and make statements that suggest otherwise - hint, taking the time to read the forum and especially the stickies at the start of it will help immensely. Just be thankful one of the really grumpy posters didn't get started.

The Brits talk in mph as well as the Yanks, about the only countries in the world who do from memory. You're right though, it would put a bit of reality into the conversation.

I typically hold 35 km/hr and I run 66 gear inches, that's on the flat (I need a slight downhill to hold more) and to be honest, it's got little to do with cadence. When you start hitting these speeds, modest though they may be, aerodynamics and the amount of power you can produce are the things that really dictate how fast you can go, which is why technique is so important. I ride my geared bike at the same speeds as I ride my fg. When I had the S3X hub on my fg, my top speeds (down a stonking hill) and speeds over all conditions matched my geared bike because I could change to higher or lower when needed. It's all about the rider, not the bike. Works the same for distance too.

Let me know when you come to England then, I'll go change the street signs to match your expectations.

Take the wheel to a bike shop to be trued. Better yet, buy a spoke wrench, watch a video on YouTube on how to true wheels, then do it yourself. As for the spinning out thing...experiment with some different gear ratios until find what fits your cycling style and terrain.